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SEO Report for https://e39e39.com

Your general SEO Checkup Score

SEO Score72/100
Average SEO score of top 100 sites: 75%This value indicates the average SEO score of the top 100 most visited websites in the US (in the past 12 months)
AI Visibility45/100
AI visibility score reflects brand reach in AI

Your site scored 72/100, below the 75 average for top sites. We found 13 issues to fix, and clearing them is how you move up. And an AI Visibility Score of 45/100 means ChatGPT, Gemini and Perplexity mention your brand only occasionally, which is ground your competitors are leaving open.

13 Failed
4 Warnings
46 Passed

Want to fix these issues and track your progress?

Issues to fix

HIGH
To improve the website experience for your visitors, it is recommended to eliminate any render-blocking resources on this webpage.
Details
HIGH
H1 and H2 tags ensure better search engine visibility and ranking by providing structure and hierarchy to the content, improving readability, and providing opportunities for keyword optimization.
Details
HIGH
Add a meta description tag to provide a brief and informative summary of the page's content for search engines.
Details
HIGH
To ensure that Search Engines can accurately identify the topic of this webpage, it is important to include the most common keywords in the title tag, meta description, and heading tags.
Details
MEDIUM
Serve properly sized images to reduce page loading times and to improve user's experience.
Details
MEDIUM
By creating a custom 404 error page with helpful links and information, users are more likely to stay on the site and continue to explore.
Details
MEDIUM
Add a Google Analytics script to this website to help in diagnosing potential SEO issues by monitoring site visitors and traffic sources.
Details
LOW
Keep in mind that the NOINDEX meta tag instructs search engines not to index a webpage. Please verify if this is the intended behavior, as the webpage will not appear in search engine results.
Details
LOW
Without an SPF record, spammers can easily spoof emails from this domain, potentially leading to compromised email security and deliverability issues.
Details
LOW
Using more than 20 HTTP requests on a webpage can negatively impact the loading time.
Details
LOW
Consider adding the Strict-Transport-Security header to your webpage to ensure that web traffic is encrypted over HTTPS, mitigating the risk of man-in-the-middle attacks and other security threats.
Details

AI Insights

Score:0
Failed:0
Warnings:0
Passed:5
Domain Business Context
Understanding the business context of a domain can help you create content that is more relevant to your target audience and differentiate your website from competitors.

What is this domain about

An online gambling and betting portal offering casino, sports, fishing, slots, lottery, guides, and promotions.

Industry Niche

Online Gambling

Target Audience

Adults interested in online betting, casino games, and promotional offers.

This test will check the business context of the domain associated with the analyzed webpage. The business context includes the domain's description, target audience and industry niche (if applicable). Understanding the business context of a domain can help you create content that is more relevant to your target audience and differentiate your website from competitors.
LLM Visibility Checker
LLM Visibility Checker

Track your brand across ChatGPT, Gemini and Claude

Get an AI Presence Score, see which of your pages get cited, and follow how you compare with competitors over time.

How visible your brand is to AI engines
Content Strengths and Weaknesses

This webpage is simple and clearly organized around online gambling services, with prominent navigation to key betting categories and support pages. However, the main content is extremely thin and generic, offering little substantive information beyond basic links and contact details.

Content Strengths

  • Clear Category Navigation
  • Visible Contact Details
  • Basic Legal Pages

Content Weaknesses

  • Very Thin Main Content
  • No Game Explanations
  • Limited Trust Evidence
This test will analyze the content of the webpage to identify its strengths and weaknesses. The analysis includes factors such as keyword usage, readability, originality, and relevance to the target audience. By understanding the strengths and weaknesses of your content, you can make informed decisions about how to improve it and better meet the needs of your audience.
Content Trust
43%
Topical Relevance88%
Subject Expertise32%
Credibility28%

This webpage shows moderate topical relevance because nearly all visible content is focused on online gambling, betting categories, and promotions. Trust is limited by the lack of substantive expertise signals and the absence of licensing, third-party validation, or detailed policy transparency beyond basic legal and contact pages.

This test will evaluate the trustworthiness of the content on the webpage. It assesses factors such as the credibility of sources, accuracy of information, and overall reliability. A high level of content trust can enhance your website's reputation and improve its ranking in search engine results.
Visual SEO Analysis
Visual SEO Analysis

Find out if your page design converts the visitors you earn

We score six things that decide whether a visitor stays and acts, from the first screen to the path to action, and rank every fix by effort and impact.

How your page's design and UX affect conversions
Content Freshness
52%

The page appears current at a surface level because it includes a 2026 copyright notice and recently dated image assets in the URL paths. However, the core content is mostly static and generic, with no publish dates, update timestamps, or time-sensitive editorial material to demonstrate active freshness.

Positive Signals

  • 2026 copyright notice
  • Recent 2026 asset paths

Staleness Signals

  • Placeholder lorem ipsum text
  • No publish or update dates
  • Static homepage content
This test will check the freshness of the content on the webpage. It evaluates how recently the content was created or updated, and whether it remains relevant to current trends and user interests. Fresh content can attract more visitors and improve your website's ranking in search engine results.
Content Opportunities

The site has room to grow from a thin promotional landing page into a more useful and trustworthy resource for gambling users. The biggest opportunities are adding substantive guides, clearer trust signals, and more decision-support content around deposits, withdrawals, and game selection.

Quick Wins

  • •Replace the placeholder homepage text with a concise introduction to the platform and its main services.
  • •Add a visible FAQ block explaining registration, deposits, withdrawals, and bonus conditions.
  • •Create a trust section linking to licensing, responsible gambling, and company background pages.
This test will identify potential content opportunities for the webpage. It analyzes the current content landscape, identifies gaps in coverage, and suggests topics or keywords that could be targeted to attract more visitors and improve search engine rankings.

Common SEO issues

Score:56
Failed:5
Warnings:1
Passed:13
Meta Title Test
100% of top 100 sites passed
This webpage is using a title tag with a length of 9 characters. While there's no target number of characters, titles should be descriptive and concise. Using a title tag with less than 20 characters is a missed opportunity since it can be difficult to fit all your targeted keywords in such a short text.
We recommend using a title with a length between 20 - 60 characters in order to fit Google Search results that have a 600-pixel limit.
Text: E39 - E39
Length: 9 characters
The meta title is an HTML element that defines a page's title, displayed in search engine results, browser tabs, and bookmark lists. A concise, keyword-relevant title is a strong on-page ranking signal and a major driver of organic click-through rate. AI answer engines and LLM-driven search experiences also rely on the title to identify, summarize, and cite the page in generative results.
Meta Description Test
92% of top 100 sites passed
This webpage is not using a meta description tag! You should include this tag in order to provide a brief description of your page which can be used by search engines. Well-written and inviting meta descriptions may also help click-through rates to your site in search engine results.

Meta Description Test

How to pass this test?

The meta description is a short summary of the page that often appears beneath the title in search results and on social previews. Fixing this issue means adding a unique, accurate, action-oriented description to each page so search engines and link unfurlers have a trusted snippet to surface. AI answer engines and social platforms also use the meta description as a high-trust summary when generating previews, citations, and shareable snippets, which makes the same fix valuable for AEO visibility.

Example

<head>
  <meta name="description" content="Compare lightweight marathon running shoes from leading brands. Specs, weight, drop, and verified runner reviews to help you choose your next pair.">
</head>

Where to make the change

  • Raw HTML: add a single <meta name="description"> tag inside the <head>. The element has no closing tag in HTML5.
  • WordPress: install a dedicated SEO plugin and fill the Meta description field on each post and page. Most plugins show a live SERP preview as you type.
  • Shopify: open the page, product, or collection editor, expand Search engine listing preview, and edit the Description field.
  • Wix or Squarespace: open the page settings, locate the SEO panel, and update the Description field.
  • Headless or framework sites: emit the meta tag from the framework's metadata API so it is present in the initial HTML response and reachable without running JavaScript.

Common causes and how to resolve them

  • Tag is missing: add a <meta name="description"> inside the <head>. CMS themes sometimes omit it from custom templates.
  • Empty content attribute: the tag exists but its content value is blank. Populate it with a unique, page-specific summary.
  • Duplicate descriptions across pages: the same boilerplate is applied site-wide, giving Google no reason to differentiate listings. Write a unique description for every important page; even templated product or category pages benefit from variant-specific copy.
  • Unescaped quotes in the value: a stray double quote inside the content attribute breaks the tag silently. Use single quotes or the HTML entity &quot; inside the value.
  • Description set only by client-side JavaScript: render the meta tag in the initial HTML response so search engines and social link unfurlers can read it without executing scripts.

Best practices

  • Length: aim for roughly 150 to 160 characters on desktop and about 120 on mobile. Front-load the most important message so it survives truncation on smaller screens.
  • Include the primary keyword: Google bolds matched query terms in the snippet, which improves visibility even though the description itself is not a direct ranking factor.
  • Use active, action-oriented language: tell the user what they will learn, find, or do on the page. Active verbs consistently outperform passive summaries on click-through rate.
  • One unique description per page: reuse is a wasted opportunity. Distinct descriptions help users choose your listing and help search engines understand which page is the best match for a query.
  • Expect occasional rewrites: Google sometimes ignores the meta description and generates a snippet from on-page content if it judges that more relevant for a given query. Strong on-page copy keeps both versions effective.
The meta description is an HTML tag that provides a short summary of a page's content, often shown beneath the title in search results. While not a direct ranking factor, an accurate and inviting description significantly improves click-through rate from organic listings. AI answer engines and social platforms also use it as a trusted summary when generating previews, citations and shareable snippets.
Google Search Results Preview Test
Desktop version
https://e39e39.com/E39 - E39
Mobile version
https://e39e39.com/E39 - E39
A simulated preview of how the page may appear in Google search results, combining the title, URL, and meta description as Google typically renders them. Useful for spotting truncated text, weak phrasing, or missing elements before publishing, since the snippet directly influences whether searchers click through.
Social Media Meta Tags Test
89% of top 100 sites passed
This webpage is using social media meta tags.
Open Graph Meta Tags
og:localevi_VN
og:typewebsite
og:titleE39 - E39
og:urlhttps://e39e39.com/
og:site_nameE39 CASINO
og:updated_time2026-10-16T17:19:23+07:00
Twitter Card Meta Tags
twitter:cardsummary_large_image
twitter:titleE39 - E39
twitter:label1Được viết bởi
twitter:data1admin
twitter:label2Thời gian để đọc
twitter:data2Chưa đến một phút
Open Graph and Twitter Card meta tags tell social platforms and link unfurlers how to display a page when its URL is shared. Well-formed tags produce richer previews with the intended title, description, and image, which improves click-through on social channels. They also serve as a structured signal that AI crawlers and answer engines can use when summarizing the page.
Most Common Keywords Test
There is likely no optimal keyword density (search engine algorithms have evolved beyond keyword density metrics as a significant ranking factor). It can be useful, however, to note which keywords appear most often on your page and if they reflect the intended topic of your page. More importantly, the keywords on your page should appear within natural sounding and grammatically correct copy.
8đăng
4nhập
3hướng
3khuyến
3liên
A frequency analysis of the most repeated words and phrases in the page's visible content. Useful for getting a quick sense of which topics search engines are likely to associate with the page, and for spotting cases where the actual content drifts from the intended subject.
Keywords Usage Test
48% of top 100 sites passed
The most common keywords of this webpage are not distributed across the important HTML tags! Primary keywords should appear in title tag, meta description and heading tags to help Search Engines to properly identify the topic of this webpage.
Keyword
Title tag
Meta description
Headings
đăng
nhập
hướng
khuyến
liên
Cross-checks whether the most frequently used keywords on the page also appear in the title and meta description. Alignment between body content and metadata helps search engines confirm the page's topic and reinforces relevance for those terms.
Keywords Cloud Test
adipiscing
aliquam
amet
casino
chính
consectetuer
contact
copyright
cskh
diam
dolor
dolore
dung
dũng
dịch
elit
email
erat
euismod
giới
hashtags
hiệu
hoàng
https
hướng
ipsum
khoản
khuyến
laoreet
liên
liệt
lorem
magna
menu
miễn
ngọc
nhanh
nhiệm
nhập
nibh
nonummy
phường
sách
thao
thiệu
thoại
thương
tincidunt
tiền
trách
việt
volutpat
zipcode
điều
điện
đăng
A visual word cloud of the page's content, with more frequent terms shown in larger text. Provides a quick at-a-glance view of which words dominate the page, helping confirm that the visible content reflects the intended topic.
Related Keywords Test
Related Keywords

See which keywords rank your URL in Google’s top 20

Get key keyword metrics like average position, search volume, CPC, and more.

A list of search queries for which the page already appears in the top organic results. Highlights the topical territory the page is winning in search and can surface unexpected terms that present new content or optimization opportunities.
Competitor Domains Test
Competitor Domains

Understand your competitors' SEO and backlink profile

Get related competitors and their domain authority score in relation to your domain.

Identifies up to ten domains that compete for similar organic search results, ranked by overall domain authority based on the volume and quality of their backlink profiles. Useful for benchmarking the competitive landscape and prioritizing which sites to study for content and link-building strategy.
Heading Tags Test
62% of top 100 sites passed
This webpage does not contain H1 headings! H1 headings help indicate the important topics of your page to search engines. While less important than good meta-titles and descriptions, H1 headings may still help define the topic of your page to search engines.

Heading Tags Test

How to pass this test?

The H1 and H2 tags give search engines and assistive technology a clean outline of the page's topics. Fixing this issue means adding a single descriptive H1 and a logical hierarchy of H2 sub-sections so the page's structure is unambiguous to both users and machines. AI answer engines also use heading structure to segment content into discrete passages they can quote or summarize, so a clean hierarchy directly helps the page get picked up in generative results.

Example

<body>
  <h1>Lightweight Running Shoes for Marathons</h1>
  <h2>What to look for in a marathon shoe</h2>
  <h2>Top picks for 2026</h2>
  <h2>How we tested</h2>
</body>

Where to make the change

  • Raw HTML: add a single <h1> near the top of the page's main content, then use <h2> for major sections and <h3> for subsections under those.
  • WordPress: in the block editor, set the post title's heading level to H1 (themes usually do this automatically) and use the Heading block for in-body H2 and H3 sections.
  • Shopify: the product or page title field renders as an H1 in most themes. Use the rich-text editor to add H2 and H3 headings inside the body.
  • Wix or Squarespace: use the heading style picker in the block editor to assign H1, H2, and H3 levels rather than just changing font size.

Common causes and how to resolve them

  • No H1 on the page: add a single <h1> that names the page's primary topic. Many themes either skip the H1 or render the site logo as one.
  • Multiple H1s: while modern HTML allows multiple H1s, most SEO tools still flag them. Pick the most important one and demote the others to H2.
  • Headings used for visual styling only: bold or large text styled to look like a heading does not help search engines or screen readers. Use the actual heading tag and style it with CSS.
  • Hierarchy skips levels: jumping from H1 directly to H3 confuses assistive technology. Keep the order H1 then H2 then H3 without gaps.

Best practices

  • One H1 per page: reserve it for the page's main subject; treat it as the in-page equivalent of the title.
  • Make headings descriptive: each heading should make sense out of context. "How we tested" is better than "Methodology" alone if the page is a product review.
  • Include keywords naturally: H1 and H2 are mid-strength ranking signals. Use the focus keyword in the H1 and supporting terms in H2s when it reads naturally.
  • Outline the page from headings alone: if you can read just the H1 and H2s and understand what the page is about, the structure is doing its job.
Inspects the page for H1 and H2 heading tags and reports their structure. Headings give both users and search engines a clear outline of the page's topics, with the H1 acting as the primary subject and H2s framing major sections. A clean heading hierarchy also helps AI answer engines segment the content into discrete passages they can quote or summarize.
Robots.txt Test
99% of top 100 sites passed
This website is using a robots.txt file.
https://e39e39.com/robots.txt
Verifies whether the site exposes a robots.txt file at the root domain. This file is the first resource most crawlers request, telling search engines and other bots which paths they may or may not access. It is also the standard mechanism for allowing or blocking modern AI crawlers used by training pipelines and answer engines.
Sitemap Test
83% of top 100 sites passed
This website has a sitemap file.
https://e39e39.com/sitemap_index.xml
Looks for an XML sitemap on the site and reports whether one is published. Sitemaps give search engines an explicit, machine-readable list of the URLs you want crawled, along with metadata such as last-modified dates, which speeds up discovery of new and updated pages. They are especially useful for large sites or those with weak internal linking.
Image Alt Test
78% of top 100 sites passed
All "img" tags from this webpage have the required "alt" attribute.
Inspects whether images on the page include descriptive alt attributes. Alt text provides accessibility for screen readers, a fallback when images fail to load, and a textual signal that helps search engines understand image content. It also improves how AI crawlers and image search tools interpret and surface the visuals.
Responsive Image Test
29% of top 100 sites passed
Not all images in this webpage are properly sized! This webpage is serving images that are larger than needed for the size of the user's viewport.

Responsive Image Test

How to pass this test?

This test fails when one or more images on the page are served at dimensions significantly larger than the size at which the browser actually renders them. Fixing this issue means resizing the source files (or serving responsive variants) so the bytes downloaded match the pixels actually displayed. The result is faster page loads, lower data usage, and better Core Web Vitals scores.

Example

<img
  src="/images/hero-800.jpg"
  srcset="/images/hero-400.jpg 400w,
          /images/hero-800.jpg 800w,
          /images/hero-1600.jpg 1600w"
  sizes="(max-width: 640px) 100vw, 800px"
  alt="Marathon runners at sunrise"
  width="800" height="450">

Where to make the change

  • Raw HTML: use srcset and sizes to let the browser pick the right variant for the user's viewport. Always include intrinsic width and height attributes.
  • WordPress: WordPress generates multiple image sizes automatically. Use the the_post_thumbnail() helper or the block editor's image block, both of which emit responsive srcset markup.
  • Shopify: use the image_url Liquid filter with size parameters (for example {{ image | image_url: width: 800 }}) and pair with image_tag to emit a responsive image.
  • Wix or Squarespace: both platforms generate responsive variants automatically; this issue is typically caused by uploading a deliberately oversized image.
  • Headless or framework sites: use the framework's image component (for example next/image or astro:assets), which generates responsive variants and lazy-loads off-screen images.

Common causes and how to resolve them

  • Original camera or stock-photo file uploaded as-is: a 6000-pixel-wide JPEG rendered in a 400-pixel column wastes most of the bytes. Resize the source or generate responsive variants.
  • No srcset: the browser has no choice but to use the single source. Add multiple variants so mobile users get smaller files.
  • Hero images sized for ultra-wide displays: if your largest layout is 1600 pixels, do not ship a 4000-pixel original.
  • Background images set in CSS without responsive sources: use the image-set() CSS function or media queries to swap in different image files at different breakpoints.

Best practices

  • Generate variants at common widths: 400, 800, 1200, and 1600 pixels covers most viewports cleanly.
  • Always set width and height: intrinsic dimensions let the browser reserve space and avoid layout shift, helping CLS.
  • Lazy-load off-screen images: add loading="lazy" to images below the fold so the browser only downloads them when needed.
  • Pair with modern formats: resizing alone is good; resizing and serving WebP or AVIF compounds the savings.
Compares the natural dimensions of each image to the size at which it is actually rendered in the user's viewport. Serving images significantly larger than needed wastes bandwidth, slows page load, and forces the browser to scale assets unnecessarily, all of which hurt performance and user experience.
Image Aspect Ratio Test
75% of top 100 sites passed
All image display dimensions match the natural aspect ratio.
Compares each image's natural aspect ratio against the ratio at which it is displayed on the page. Significant mismatches result in stretched or squashed visuals that look unprofessional and degrade the user experience.
Deprecated HTML Tags Test
94% of top 100 sites passed
This webpage does not use HTML deprecated tags.
Scans the markup for HTML elements that are no longer part of the modern HTML specification. Deprecated tags may still render today, but browsers can drop support at any time, leading to broken layouts and rendering inconsistencies. Replacing them with current standards keeps the page resilient and easier to maintain.
Google Analytics Test
72% of top 100 sites passed
A Google Analytics script is not detected on this page. While there are several tools available to monitor your site's visitors and traffic sources, Google Analytics is a free, commonly recommended program to help diagnose potential SEO issues.

Google Analytics Test

How to pass this test?

Google Analytics 4 is a free measurement platform that records visitor behavior, traffic sources, and conversion data. Installing it does not directly affect rankings, but the data it produces is essential for measuring SEO performance, identifying high-value pages, and prioritizing future optimization work. Fixing this issue means installing the GA4 tag site-wide and confirming events appear in your reports.

Example

<!-- Place inside <head> on every page -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-XXXXXXXXXX"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());
  gtag('config', 'G-XXXXXXXXXX');
</script>

Where to make the change

  • Raw HTML: paste the GA4 snippet into the <head> of every page. A shared layout file is the cleanest place.
  • WordPress: use a site-kit or analytics plugin, or paste the snippet into your theme's header file. Avoid duplicating the tag across multiple plugins.
  • Shopify: add the GA4 measurement ID under Online Store, Preferences, Google Analytics, or install the official Google channel app.
  • Wix or Squarespace: both platforms offer a GA4 measurement ID field in their analytics settings panel.
  • Headless or framework sites: install via Google Tag Manager or use the framework's analytics integration so the tag fires on every route change.

Common causes and how to resolve them

  • Tag not installed at all: install GA4 using the snippet above or the platform-specific path.
  • Universal Analytics tag still in place: Universal Analytics stopped processing data on July 1, 2024. Replace any UA tag (UA-...) with a GA4 measurement ID (G-...).
  • Tag fires only on the homepage: ensure the snippet is in a shared template loaded by every page, not pasted into one post.
  • Cookie banner blocks the tag before consent: integrate Consent Mode v2 so GA4 receives anonymized signals before consent and full data after.
  • Tag duplicated: two snippets on the same page double-count sessions. Audit with the Tag Assistant browser extension and remove duplicates.

Best practices

  • Verify with real-time reports: after installing, open GA4's Realtime view and load the site to confirm events arrive.
  • Use Google Tag Manager: for any site beyond the simplest, GTM gives you a single place to manage analytics, conversion tags, and third-party scripts without code changes.
  • Configure key events: mark conversions (purchase, lead, signup) as key events so reports highlight what matters for SEO ROI.
  • Link to Search Console: connecting GA4 to Search Console surfaces organic queries alongside on-site behavior in the same reports.
Detects whether the page is instrumented with Google Analytics tracking code. Analytics is not an SEO ranking factor, but having reliable traffic and behavior data is essential for measuring the impact of SEO work and identifying opportunities for improvement.
Favicon Test
100% of top 100 sites passed
favicon
This website appears to have a favicon.
Verifies whether the site declares a favicon and that it loads correctly. Favicons appear in browser tabs, bookmarks, and increasingly in search engine result pages, where they reinforce brand recognition and make a listing easier to spot at a glance.
Backlinks Test
Backlinks

Get a full and detailed list of your backlinks

See every website linking to yours, along with detailed backlink data.

Surfaces the external pages that link to the analyzed URL. Backlinks from authoritative, topically relevant sites remain one of the strongest off-page ranking signals, while a profile dominated by low-quality or spammy links can attract algorithmic penalties. Reviewing the inbound link mix helps identify both link-building wins and toxic links worth disavowing.
JS Error Test
83% of top 100 sites passed
There are no severe JavaScript errors on this webpage.
Inspects the page for JavaScript runtime errors that occur as it loads. Unhandled errors can break interactive features, leave content unrendered, and signal poor code quality, all of which hurt the user experience that search engines factor into rankings.
Console Errors Test
27% of top 100 sites passed
This webpage doesn't have any warnings or errors caught by the Chrome DevTools Console.
Reviews the browser console for warnings and errors emitted while the page loads. Console messages often expose underlying issues such as failed network requests, deprecated APIs, or security warnings that can quietly degrade the experience even when the page appears to work.
Charset Declaration Test
96% of top 100 sites passed
This webpage has a character encoding declaration.
Content-Type: text/html; charset=UTF-8
Checks whether the page declares a character encoding such as UTF-8. Without an explicit charset declaration, browsers must guess the encoding, which can lead to garbled symbols, broken accented characters, and inconsistent rendering across devices. UTF-8 is the modern standard recommended by Google.

Speed optimizations

Score:81
Failed:2
Warnings:3
Passed:15
HTML Page Size Test
23% of top 100 sites passed
The size of this webpage's HTML is 14.29 Kb and is under the average webpage's HTML size of 33 Kb. Faster loading websites result in a better user experience, higher conversion rates, and generally better search engine rankings.
Measures the size of the raw HTML document, excluding images and external CSS or JavaScript. Bloated HTML increases time to first byte and parsing time, slowing down rendering on mobile networks and lower-powered devices. Trimming inline styles, redundant markup, and oversized inline data keeps initial load fast.
DOM Size Test
56% of top 100 sites passed
The Document Object Model (DOM) of this webpage has 327 nodes which is less than the recommended value of 1,500 nodes.
Measures the size and depth of the page's Document Object Model, the tree of nodes the browser builds from the HTML. Very large DOMs increase memory usage, lengthen style and layout calculations, and slow down rendering, particularly on mobile devices. Keeping the DOM lean improves both load time and runtime responsiveness.
HTML Compression/GZIP Test
99% of top 100 sites passed
This webpage is successfully compressed using zstd compression on your code. The HTML code is compressed from 61.62 Kb to 14.29 Kb (77% size savings). This helps ensure a faster loading webpage and improved user experience.
Verifies whether the server delivers the HTML using a compression algorithm such as Gzip or Brotli. Compressed responses dramatically reduce transfer size with negligible decompression cost, translating directly into faster page loads, especially on slower connections.
Site Loading Speed Test
71% of top 100 sites passed
The loading time of this webpage (measured from N. Virginia, US) is around 2.98 seconds and this is under the average loading speed which is 5 seconds.
Related Keywords

Accurate historical loading speed monitor and reports

Get detailed and accurate loading speed reports for your websites and see how your pages are being loaded over time.

Measures the overall time required to load the page in the browser. Page speed is a confirmed Google ranking factor and a strong driver of bounce rate, with slower pages losing a meaningful share of users before they even see the content. Faster pages also tend to convert better, making this a key metric for both SEO and revenue.
JS Execution Time Test
53% of top 100 sites passed
The JavaScript code used by this webpage is executed in less than 2 seconds.
Reports the total time the browser spends parsing, compiling, and executing JavaScript while the page loads. Heavy JavaScript work blocks the main thread and is the primary cause of poor Interaction to Next Paint, the Core Web Vital that replaced First Input Delay in 2024 and that Google uses as part of its ranking algorithms. Reducing bundle size and deferring non-critical scripts directly improves perceived performance.
Page Objects Test
7% of top 100 sites passed
This webpage is using more than 20 http requests, which can slow down page loading and negatively impact user experience!
Content size by content type
Content type
Percent
Size
javascript
34.7 %
118.86 Kb
image
34.5 %
118.15 Kb
font
17.6 %
60.25 Kb
css
8.6 %
29.36 Kb
html
4.5 %
15.38 Kb
other
0.1 %
438 B
TOTAL
100%
342.42 Kb
Requests by content type
Content type
Percent
Requests
javascript
44.0 %
11
font
28.0 %
7
css
12.0 %
3
image
8.0 %
2
html
4.0 %
1
other
4.0 %
1
TOTAL
100%
25
Content size by domain
Domain
Percent
Size
e39e39.com
81.4 %
278.82 Kb
fonts.gstatic.com
15.3 %
52.34 Kb
static.cloudflareinsights.com
3.0 %
10.23 Kb
fonts.googleapis.com
0.3 %
1.02 Kb
TOTAL
100%
342.42 Kb
Requests by domain
Domain
Percent
Requests
e39e39.com
68.0 %
17
fonts.gstatic.com
24.0 %
6
fonts.googleapis.com
4.0 %
1
static.cloudflareinsights.com
4.0 %
1
TOTAL
100%
25
Verifies that every resource the page requests, including images, scripts, stylesheets, and fonts, can be successfully retrieved. Broken or unreachable assets can leave the page rendered incorrectly, trigger console errors, and damage both user experience and how search engines perceive page quality.
CDN Usage Test
95% of top 100 sites passed
This webpage is serving all images, javascript and css resources from CDNs.
Detects whether static assets such as images, JavaScript, and CSS are delivered through a Content Delivery Network. CDNs serve files from edge locations close to the user, reducing latency, improving cache hit rates, and offloading traffic from the origin server. The result is faster, more consistent page performance worldwide.
Modern Image Format Test
43% of top 100 sites passed
This webpage is using images in a modern format.
Identifies images served in legacy formats such as JPEG and PNG instead of modern alternatives like WebP or AVIF. Modern formats compress significantly better at equivalent visual quality, which means smaller transfers, faster page loads, and lower data usage for visitors on metered connections.
Image Metadata Test
72% of top 100 sites passed
This webpage is not using images with large metadata.
Flags images carrying disproportionately large embedded metadata such as EXIF data, thumbnails, color profiles, geolocation, and camera information. This metadata is rarely useful on the web and adds bytes to every request without any rendering benefit, making it an easy win for shrinking image payloads.
Image Caching Test
95% of top 100 sites passed
This website is using cache headers for images and the browsers will display these images from the cache.
Inspects whether image responses include caching headers that allow browsers to store them for repeat visits. With proper caching directives, returning visitors retrieve images from the local cache instead of refetching them, producing noticeably faster subsequent page loads.
JavaScript Caching Test
96% of top 100 sites passed
This webpage is using cache headers for all JavaScript resources.
Inspects whether external JavaScript files are served with caching headers that allow browsers to store and reuse them. Cached scripts skip the network on repeat visits, reducing load time and bandwidth for returning users without sacrificing the ability to push fresh code by versioning file URLs.
CSS Caching Test
98% of top 100 sites passed
This webpage is using cache headers for all CSS resources.
Inspects whether external CSS files are served with caching headers that allow browsers to store and reuse them. Cached stylesheets skip the network on repeat visits, reducing load time for returning users while still allowing updates through versioned filenames.
JavaScript Minification Test
98% of top 100 sites passed
All JavaScript files used by this webpage are minified.
Detects whether external JavaScript files are minified by stripping whitespace, comments, and shortening identifiers. Minified scripts are substantially smaller and faster to download and parse, which lowers page load time and improves Core Web Vitals scores.
CSS Minification Test
100% of top 100 sites passed
All CSS resources used by this webpage are minified.
Detects whether external CSS files are minified by removing whitespace, comments, and unused characters. Minification reduces stylesheet size with no functional change, leading to faster downloads and quicker first render.
Render Blocking Resources Test
15% of top 100 sites passed
This webpage is using render blocking resources! Eliminating render-blocking resources can help this webpage to load significantly faster and will improve the website experience for your visitors.

Render Blocking Resources Test

How to pass this test?

This test fails when JavaScript or CSS resources block the browser from rendering visible content. Each render-blocking file delays the first paint, and on slower networks the cumulative impact can be severe. Fixing this issue means inlining the truly critical CSS, deferring or asynchronously loading non-essential scripts, and removing unused code.

Example

<head>
  <!-- Inline only above-the-fold critical CSS -->
  <style>/* critical styles here */</style>

  <!-- Load full stylesheet asynchronously -->
  <link rel="preload" href="/styles/main.css" as="style"
        onload="this.onload=null;this.rel='stylesheet'">

  <!-- Defer non-critical scripts -->
  <script src="/scripts/app.js" defer></script>
</head>

Where to make the change

  • Application code or templates: identify the CSS and JavaScript needed for the initial render and load only those synchronously. Defer the rest.
  • Build pipeline: use a critical CSS extractor (such as critical or penthouse) to generate the above-the-fold styles automatically.
  • WordPress: performance plugins offer "delay JS execution" and "load CSS asynchronously" options that handle most of this without code changes.
  • Headless or framework sites: use the framework's preload and code-splitting hints to control what blocks rendering.

Common causes and how to resolve them

  • Single large stylesheet blocking render: inline critical CSS for the first viewport, load the full stylesheet asynchronously.
  • Synchronous third-party scripts in the head: add defer or async, or move them to the end of the body.
  • Web fonts blocking text rendering: add font-display: swap in @font-face rules so the fallback font shows immediately.
  • Render-blocking @import in CSS: replace with separate <link rel="stylesheet"> tags so the browser can fetch them in parallel.

Best practices

  • Use defer for scripts that need the DOM: they execute after parsing but before DOMContentLoaded.
  • Use async for fully independent scripts: they execute as soon as they download, in any order.
  • Preload the critical request chain: tell the browser early about fonts and key assets with <link rel="preload">.
  • Audit with Lighthouse: the Render-blocking resources audit lists every offending file with the estimated time saved by deferring it.
Identifies JavaScript and CSS resources that the browser must download and process before it can render visible content. Each render-blocking file delays the first paint, and on slower networks the cumulative impact can be severe. Inlining critical styles, deferring non-essential scripts, and removing unused code all help unblock the rendering path.
URL Redirects Test
97% of top 100 sites passed
This URL doesn't have any redirects (which could potentially cause site indexation issues and site loading delays).
Counts the number of HTTP redirects required for the URL to resolve to its final destination. Each hop adds latency and can dilute link equity, while long redirect chains sometimes confuse crawlers and indexing pipelines. Keeping redirects short and direct is a Google recommendation for both performance and SEO.
Time To First Byte Test
99% of top 100 sites passed
The Time To First Byte value of this webpage is 1.110 seconds. To provide a good user experience, Google recommends that sites should strive to have a TTFB of 0.8 seconds or less.
1.11 s
0.8 s
1.8 s

Time To First Byte Test

How to pass this test?

Time to First Byte (TTFB) measures the delay between the browser requesting the page and the first byte of the response arriving. TTFB reflects backend, network, and CDN performance and effectively sets the floor for every other loading metric, since rendering cannot begin until bytes start flowing. Fixing this issue usually means improving server response time, adding edge caching, or reducing redirect chains.

Where to make the change

  • Server and hosting: upgrade to a faster host plan, move to a region closer to your users, and enable HTTP/2 or HTTP/3.
  • CDN: putting the site behind a CDN dramatically reduces TTFB for users far from the origin server. Cache HTML responses at the edge whenever possible.
  • Application code: profile slow endpoints, cache expensive database queries and external API calls, and use streaming or partial responses.

Common causes and how to resolve them

  • Slow server processing: profile the slowest controllers or routes. Database queries, N+1 loops, and synchronous third-party API calls are typical culprits.
  • No edge caching: caching HTML at the CDN reduces TTFB to a single edge round trip. Use rules to bypass cache for logged-in users.
  • Long redirect chains: each hop adds latency before bytes flow. Collapse chains so the URL the user requests resolves to its final destination in one step.
  • Origin in a distant region: a US-only origin makes Asian users wait. Add edge regions or move the origin closer to the audience.
  • HTTP/1.1 or no keep-alive: upgrading to HTTP/2 or HTTP/3 reduces connection setup overhead.

Best practices

  • Target sub-800 millisecond TTFB at the 75th percentile: Google's recommended threshold for a "good" experience.
  • Cache aggressively: the cheapest server work is the work you never do. Static and semi-static pages should be served from cache.
  • Use HTTP/3 where supported: it eliminates head-of-line blocking and reduces handshake latency, especially on mobile networks.
  • Stream the response when possible: sending the head before the rest of the body lets the browser start fetching subresources earlier.
Measures Time to First Byte, the delay between the browser requesting the page and the first byte of the response arriving. TTFB reflects backend, network, and CDN performance and effectively sets the floor for every other loading metric, since rendering cannot begin until bytes start flowing. Sustained high TTFB usually points to slow server processing, missing edge caching, or inefficient redirects.
First Contentful Paint Test
90% of top 100 sites passed
The First Contentful Paint value of this webpage is 2.404 seconds. To provide a good user experience, Google recommends that sites should strive to have a First Contentful Paint value of 1.8 seconds or less.
2.404 s
1.8 s
3 s

First Contentful Paint Test

How to pass this test?

First Contentful Paint (FCP) measures the time from when the page starts loading to when any part of its content is rendered on the screen. FCP is the user's first visual confirmation that the page is loading, and faster values are strongly correlated with lower bounce rates and better Core Web Vitals scores. Fixing this issue means reducing time to first byte, eliminating render-blocking resources, and serving above-the-fold content without delay.

Where to make the change

  • Server and CDN: reduce TTFB so the browser receives bytes sooner. Edge caching for HTML produces dramatic FCP wins.
  • Application code or templates: inline the critical CSS for above-the-fold content and defer everything not needed for the first paint.
  • Build pipeline: ensure JavaScript bundles are split so the initial load only includes what is needed for first render.

Common causes and how to resolve them

  • Slow TTFB: address the underlying server, redirect, or hosting issue (see Time to First Byte fix).
  • Render-blocking CSS: inline the critical CSS for the first viewport, load the full stylesheet asynchronously.
  • Render-blocking JavaScript in the head: add defer or move scripts to the end of the body.
  • Web fonts delaying text rendering: add font-display: swap so a fallback font is shown immediately while the custom font loads.
  • Heavy hero image without prioritization: add fetchpriority="high" to the hero image and <link rel="preload"> for it in the head.

Best practices

  • Target sub-1.8 second FCP at the 75th percentile: Google's recommended threshold for a "good" experience.
  • Inline critical CSS: the styles needed for the first viewport should not require an extra network round trip.
  • Preload key resources: hero image, key fonts, and critical scripts benefit from explicit preload hints.
  • Defer non-critical work: analytics, chat widgets, and below-the-fold content can wait until after first paint.
Measures First Contentful Paint, the moment when the browser renders the first piece of visible content from the DOM, such as text, an image, or an SVG. FCP is the first signal to the user that the page is actually loading, and faster values are strongly correlated with lower bounce rates and better Core Web Vitals scores.
Largest Contentful Paint Test
77% of top 100 sites passed
The Largest Contentful Paint duration of this webpage is 2.94 seconds. To provide a good user experience, Google recommends that sites should strive to have Largest Contentful Paint of 2.5 seconds or less.
2.94 s
2.5 s
4 s
Largest Contentful Paint element within the viewport:
<img fetchpriority="high" decoding="async" width="1920" height="600" src="https://e39e39.com/wp-content/uploads/2026/10/e39-..." class="attachment-original size-original" alt="E39 – Ưu Đãi Độc Quyền Tân Thủ, Nạp 39K Tặng 8888K" srcset="https://e39e39.com/wp-content/uploads/2026/10/e39-..." sizes="(max-width: 1920px) 100vw, 1920px" title="E39 1">

Largest Contentful Paint Test

How to pass this test?

Largest Contentful Paint (LCP) measures when the largest visible element in the viewport, such as a hero image or main heading, finishes rendering. LCP is one of Google's Core Web Vitals and a direct ranking factor, used as a proxy for when the user perceives the page as effectively loaded. Fixing this issue means identifying the LCP element and ensuring it loads as early as possible.

Where to make the change

  • Identify the LCP element: open Chrome DevTools, run a Performance trace, and find the LCP marker. The element it points at is the one to optimize.
  • Application code or templates: preload the LCP image, give it fetchpriority="high", and ensure it is in the initial HTML rather than injected by JavaScript.
  • Server and CDN: reduce TTFB and ensure the LCP image is served from a fast, geographically close origin.

Common causes and how to resolve them

  • Hero image loaded lazily: remove loading="lazy" from the LCP image; it should load eagerly.
  • LCP image not preloaded: add <link rel="preload" as="image" href="/hero.jpg" fetchpriority="high"> in the head so the browser fetches it before parsing the rest of the document.
  • LCP image too large or in legacy format: resize to displayed dimensions and serve as WebP or AVIF.
  • Slow TTFB or render-blocking resources: address the underlying TTFB and render-blocking issues; LCP cannot be fast if the page itself is slow to start.
  • Client-side rendered hero content: server-render or pre-render the LCP element so it appears in the initial HTML.
  • Web fonts delaying LCP text: use font-display: swap so the LCP heading renders immediately in a fallback font.

Best practices

  • Target sub-2.5 second LCP at the 75th percentile: the official Core Web Vitals threshold for a "good" experience.
  • Preload the LCP image: the single highest-impact LCP optimization on most sites.
  • Use fetchpriority="high": tells the browser to prioritize the resource ahead of others.
  • Ship modern image formats: AVIF and WebP cut hero image bytes substantially, which directly lowers LCP.
Measures Largest Contentful Paint, the time at which the largest visible element in the viewport, such as a hero image or main heading, finishes rendering. LCP is one of Google's Core Web Vitals and a direct ranking factor, used as a proxy for when the user perceives the page as effectively loaded.
Cumulative Layout Shift Test
91% of top 100 sites passed
The CLS score of this webpage is 0.0002. To provide a good user experience, Google recommends that sites should strive to have a CLS score of 0.1 or less.
0.0002
0.1
0.25
DOM element which contributes the most to CLS score:
Text: E39 CASINO THỂ THAO BẮN CÁ NỔ HŨ XỔ SỐ HƯỚNG DẪN KHUYẾN MÃI
Html: <ul class="nav header-nav header-bottom-nav nav-center nav-s...">
Score: 0.0002
Measures Cumulative Layout Shift, the total amount that visible elements move around unexpectedly while the page loads. Layout shifts cause users to misclick and feel the page is unstable, and CLS is one of Google's Core Web Vitals and a direct ranking factor. Common causes include images without explicit dimensions, late-loading fonts, and aggressively injected overlays such as cookie consent banners.

Server and security

Score:95
Failed:1
Warnings:0
Passed:6
URL Canonicalization Test
93% of top 100 sites passed
https://e39e39.com/ and https://www.e39e39.com/ resolve to the same URL.
Detects whether different URL variants of the site, such as the apex domain and the www subdomain or HTTP and HTTPS, all resolve consistently to a single canonical version. When the same content is reachable at multiple URLs without proper redirects, search engines may split ranking signals across the variants and become unsure which one to index.
SSL Checker and HTTPS Test
100% of top 100 sites passed
This website is successfully using HTTPS, a secure communication protocol over the Internet.
The certificate is not used before the activation date.
The certificate has not expired.
The hostname "e39e39.com" is correctly listed in the certificate.
The certificate should be trusted by all major web browsers.
The certificate was not revoked.
The certificate was signed with a secure hash.
Certificate Chain:
Server certificate
Common Name
e39e39.com
Subject Alternative Names
*.e39e39.com, e39e39.com
Not Valid Before
Thu, October 15, 2026 at 6:19:07 AM UTC
Not Valid After
Wed, January 13, 2027 at 6:19:06 AM UTC
Signature Algorithm
ecdsaWithSha384
Issuer
YE2
Intermediate certificate
Common Name
YE2
Organization
Let's Encrypt
Location
US
Not Valid Before
Wed, September 3, 2025 at 12:00:00 AM UTC
Not Valid After
Sat, September 2, 2028 at 11:59:59 PM UTC
Signature Algorithm
ecdsaWithSha384
Issuer
Root YE
Intermediate certificate
Common Name
Root YE
Organization
ISRG
Location
US
Not Valid Before
Wed, May 13, 2026 at 12:00:00 AM UTC
Not Valid After
Thu, September 2, 2032 at 11:59:59 PM UTC
Signature Algorithm
ecdsaWithSha384
Issuer
ISRG Root X2
Root certificate
Common Name
ISRG Root X2
Organization
Internet Security Research Group
Location
US
Not Valid Before
Fri, September 4, 2020 at 12:00:00 AM UTC
Not Valid After
Mon, September 17, 2040 at 4:00:00 PM UTC
Signature Algorithm
ecdsaWithSha384
Issuer
ISRG Root X2
Verifies whether the site is served over HTTPS with a valid TLS certificate. HTTPS encrypts the connection between visitor and server, protecting credentials and other sensitive data in transit, and Google has used it as a positive ranking signal since 2014. Modern browsers also flag non-HTTPS pages as Not Secure, which damages user trust.
Mixed Content Test (HTTP over HTTPS)
100% of top 100 sites passed
This webpage does not use mixed content - both the initial HTML and all other resources are loaded over HTTPS.
Detects whether a page served over HTTPS is loading any sub-resources such as images, scripts, or stylesheets over insecure HTTP. Mixed content weakens the security guarantees of HTTPS, and modern browsers either block the resources outright or warn the user, often breaking the page in the process.
HTTP2 Test
99% of top 100 sites passed
This webpage is using the HTTP/2 protocol.
Verifies whether the page and its resources are delivered over HTTP/2 or newer, rather than the legacy HTTP/1.1 protocol. HTTP/2 introduces multiplexing, header compression, and prioritization, which together reduce latency and allow the browser to load many resources from the same origin far more efficiently.
HSTS Test
84% of top 100 sites passed
This webpage is not using the Strict-Transport-Security header! This is a security header that was created as a way to force the browser to use secure connections when a site is running over HTTPS.

HSTS Test

How to pass this test?

The Strict-Transport-Security (HSTS) response header tells browsers to access the site only over HTTPS, automatically upgrading future requests and refusing to fall back to HTTP. Fixing this issue means configuring the server to send the header on every HTTPS response.

Example

Strict-Transport-Security: max-age=31536000; includeSubDomains; preload

Where to make the change

  • Server configuration: add the header in Nginx (add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;), Apache (Header always set Strict-Transport-Security ...), or your application's response middleware.
  • CDN: Cloudflare, Fastly, and CloudFront let you set HSTS at the edge so it applies regardless of origin configuration.
  • Cloud platforms: Netlify and Vercel allow HSTS via headers files (_headers on Netlify, vercel.json on Vercel).

Common causes and how to resolve them

  • Header not sent: add it in the server or CDN config. Confirm in DevTools, Network tab.
  • Header sent only on HTTP responses: HSTS is only honored over HTTPS, so the header must accompany the HTTPS response.
  • Short max-age: a max-age below a few months provides little protection. Bump to a year (31536000) once you are confident HTTPS is stable.
  • includeSubDomains breaking subdomains that lack HTTPS: only add this directive after every subdomain serves HTTPS. Otherwise users will lose access to the HTTP-only ones.

Best practices

  • Start with a short max-age, then ramp up: a one-week max-age lets you back out quickly if something breaks. Increase to a year once stable.
  • Add preload after testing: submit your domain to hstspreload.org so browsers ship with HSTS for your site baked in. Note that removing a preloaded site is slow.
  • Pair with HTTP-to-HTTPS redirects: HSTS only kicks in after a successful HTTPS visit. Until then, redirects do the work.
Checks whether the server sends a Strict-Transport-Security header instructing browsers to only access the site over HTTPS. HSTS protects users from protocol downgrade attacks and accidental exposure to insecure connections, and is a baseline requirement for any site handling sensitive data.
Plaintext Emails Test
97% of top 100 sites passed
This webpage does not include email addresses in plaintext.
Scans the page for email addresses written in plain text. Spambots harvest such addresses to add them to bulk mailing lists, so obfuscating contact emails or replacing them with contact forms helps reduce inbox spam without hiding the address from legitimate visitors.
Unsafe Cross-Origin Links Test
45% of top 100 sites passed
This webpage is not using target="_blank" links without rel="noopener" or rel="noreferrer" attribute.
Inspects external links opened in a new tab to confirm they include the noopener or noreferrer relationship attributes. Modern browsers now apply noopener implicitly to such links, so this is largely a defense for older browsers and a way to keep the destination page from running in the same process as the original tab. Including the attributes explicitly remains a security and performance best practice.

Mobile usability

Score:100
Failed:0
Warnings:0
Passed:3
Meta Viewport Test
92% of top 100 sites passed
This webpage is using a viewport meta tag.
<meta name="viewport" content="width=device-width, initial-scale=1" />
Checks whether the page declares a viewport meta tag that controls how the layout scales on mobile devices. Without it, mobile browsers render the page at a default desktop width and shrink it to fit, producing unreadable text and unusable touch targets. A correct viewport declaration is the foundation of responsive design.
Media Query Responsive Test
98% of top 100 sites passed
This webpage is using CSS media queries, which is the base for responsive design functionalities.
Detects whether the page's stylesheets use CSS media queries to adapt the layout to different screen sizes. Media queries are the primary mechanism for responsive design, allowing typography, spacing, and component arrangement to adjust gracefully from phones to large desktops. Because Google now indexes the web mobile-first, the responsive mobile layout is effectively the version search engines crawl, evaluate, and rank.
Mobile Snapshot Test
Mobile view
A rendered screenshot of how the page appears on a mobile device. Useful for visually confirming that responsive layouts work as intended and for spotting issues such as overflowing content, illegible text, or broken images that automated checks alone may miss.

Advanced SEO

Score:43
Failed:5
Warnings:0
Passed:4
Structured Data Test
66% of top 100 sites passed
This webpage is using structured data.
Inspects the page for structured data markup such as JSON-LD or Microdata that follows schema.org vocabularies. Structured data helps search engines understand entities and relationships on the page, often unlocking rich result features in SERPs such as star ratings, FAQs, recipes, and product cards. It is also a primary signal AI answer engines use to extract precise facts when generating responses.
Custom 404 Error Page Test
80% of top 100 sites passed
This website is not using a custom 404 error page! Default 404 error pages result in a poor experience - it can mislead users into thinking an entire site is down or broken, greatly increases the chance they leave the website entirely, and looks unprofessional. We recommend to have a custom 404 error page in order to improve the website's user experience by letting users know that only a specific page is missing/broken (and not the entire site), providing them helpful links, the opportunity to report bugs, and potentially track the source of broken links.

Custom 404 Error Page Test

How to pass this test?

This test fails when the site does not serve a branded, helpful page for missing URLs. A custom 404 keeps users on the site by offering navigation, search, and suggested links rather than dropping them at the browser's generic error screen. Fixing this issue means designing a 404 template, ensuring it returns the correct HTTP 404 status, and pointing your server at it.

Where to make the change

  • Server configuration: point your web server at a custom 404 page. In Nginx, use error_page 404 /404.html;. In Apache, use ErrorDocument 404 /404.html.
  • WordPress: create a 404.php template in your theme. WordPress invokes it automatically for missing URLs.
  • Shopify: edit the 404.liquid template in the theme code editor.
  • Wix or Squarespace: use the platform's built-in 404 page editor in site settings.
  • Headless or framework sites: Next.js uses not-found.js, Astro uses 404.astro, and similar frameworks all have a convention for the missing-route page.

Common causes and how to resolve them

  • No custom 404 at all: create one. The minimum is the site header, navigation, a clear "page not found" message, and links to popular sections.
  • 404 page returns HTTP 200: a "soft 404" confuses search engines. Verify the response status with DevTools or curl, and configure the server to return 404 for missing routes.
  • 404 page redirects to homepage: redirecting users to the homepage hides broken URLs from analytics and search engines. Show a real 404 instead.
  • Generic browser error visible: the server is not invoking the custom template. Check the configuration directive.

Best practices

  • Keep the site chrome: show the header, footer, and navigation so users do not feel lost.
  • Offer next steps: a search box, popular links, or category navigation help users get back on track.
  • Track 404s: log missing-URL hits in analytics so you can spot broken inbound links worth fixing or redirecting.
  • Be clear about the error: "Sorry, that page does not exist" is better than vague messaging that confuses users.
Detects whether the site serves a branded, helpful page when a requested URL is not found, instead of the browser's generic error screen. A custom 404 keeps users on the site by offering navigation, search, or suggested links, which reduces frustration and protects engagement metrics that influence both UX perception and indirect SEO outcomes.
Noindex Tag Test
99% of top 100 sites passed
This webpage is using the noindex meta tag! This means that it will be read but not indexed by search engines.

Noindex Tag Test

How to pass this test?

This test fails when the page is being excluded from search engine indexes via a noindex directive in the robots meta tag or X-Robots-Tag HTTP header. A noindex on the wrong page is one of the most common ways important content silently disappears from search results. Fixing this issue means removing the directive from any page that should rank.

Where to make the change

  • Raw HTML: remove <meta name="robots" content="noindex"> from the <head> of pages you want indexed.
  • Server configuration: remove or update X-Robots-Tag: noindex response headers for affected URL paths.
  • WordPress: in the post or page editor, your SEO plugin has a "Search engine visibility" toggle. Make sure it is set to allow indexing. Also check Settings, Reading, "Discourage search engines" — this site-wide flag must be off.
  • Shopify: certain templates and resource types (search results, cart) are noindexed by default and should stay that way. For other URLs, edit theme.liquid to remove the conditional noindex.
  • Headless or framework sites: remove the meta tag from the page's metadata configuration or layout file.

Common causes and how to resolve them

  • Site-wide noindex left over from staging: the most common cause. Disable the global setting after launch.
  • Per-page noindex set in the CMS by mistake: review the page's SEO settings and toggle indexing back on.
  • X-Robots-Tag header set by server config: check the server or CDN rules; remove the header for production URLs.
  • Noindex on category or tag pages that should rank: some SEO plugins noindex archives by default. Override the setting for archives that earn organic traffic.

Best practices

  • Verify with URL Inspection in Search Console: the live test confirms whether Google currently sees the page as indexable.
  • Audit after migrations: staging sites are usually noindexed; verify the directive is removed before traffic resumes.
  • Keep noindex for thin or duplicate pages: not every page should rank. Internal search results, paginated archives, and login pages benefit from noindex.
Detects whether the page is being excluded from search engine indexes via a noindex directive in the robots meta tag or X-Robots-Tag HTTP header. A noindex on the wrong page is one of the most common ways important content silently disappears from search results, so verifying its absence on pages meant to rank is critical.
Canonical Tag Test
93% of top 100 sites passed
This webpage does not use the canonical link tag.
Detects whether the page declares a canonical link tag indicating its preferred URL. Canonical tags consolidate ranking signals across duplicate or near-duplicate URLs onto a single authoritative version, which prevents search engines from splitting authority across variants caused by query parameters, session IDs, or alternate paths. They also help AI crawlers identify the source of truth when citing the page.
Nofollow Tag Test
This webpage is using the nofollow meta tag! We recommend to use this tag carefully since search engines will not crawl all links from this webpage.

Nofollow Tag Test

How to pass this test?

This test reports on whether the page applies a nofollow directive that tells search engines not to follow outbound links. The nofollow attribute (and the related sponsored and ugc values) controls how link equity flows from your page. Fixing this issue means using the right rel value on each external link based on its purpose so signals are passed only where you intend.

Where to make the change

  • Raw HTML: add rel="nofollow", rel="sponsored", or rel="ugc" to specific outbound links rather than blanket-applying them site-wide.
  • WordPress: the block editor offers a "mark as nofollow" option per link, and SEO plugins can auto-tag external links by domain.
  • Shopify, Wix, Squarespace: editor-generated links allow rel attribute toggles; manual HTML embeds need them set explicitly.
  • Headless or framework sites: wrap external links in a component that decides the rel based on the link's classification.

Common causes and how to resolve them

  • Site-wide nofollow on every external link: overly aggressive. Reserve nofollow for sponsored, untrusted, or user-generated content.
  • Sponsored content not labeled: use rel="sponsored" on paid placements and affiliate links to comply with Google's link spam policy.
  • User-generated content unmarked: comments, forum posts, and review user submissions should use rel="ugc".
  • Trusted editorial links nofollowed: these should pass equity. Remove the nofollow.

Best practices

  • Use the most specific value: sponsored for paid links, ugc for user content, nofollow for everything else you want to disclaim. They can be combined: rel="sponsored noopener".
  • Do not nofollow internal links: "PageRank sculpting" with internal nofollow no longer works and just wastes crawl signal.
  • Audit periodically: as content ages, sponsored relationships change. Review affiliate and partner links once a year.
Detects whether the page applies a nofollow directive, either through a robots meta tag, an X-Robots-Tag header, or per-link rel attributes, that tells search engines not to follow outbound links. Google recommends nofollow for sponsored links and for user-generated content where the linked sites are not vetted, so its presence or absence has real consequences for how link equity flows.
Disallow Directive Test
Your robots.txt file includes a disallow command which instructs search engines to avoid certain parts of your website! You are advised to confirm if access to these resources or pages are intended to be blocked (e.g., if they contain internal-only content or sensitive information).
Surfaces the disallow rules declared in the site's robots.txt file. Disallow directives tell search engine crawlers not to access specific files, paths, or directories, which is useful for keeping admin sections and duplicate content out of indexes but dangerous when applied too broadly, since over-blocking can hide important pages from search.
Meta Refresh Test
98% of top 100 sites passed
This webpage is not using a meta refresh tag.
Detects whether the page uses a meta refresh tag to automatically reload or redirect after a delay. Meta refresh is largely obsolete, hurts accessibility by jumping focus and disorienting screen reader users, and is a weaker signal to search engines than a proper server-side 301 redirect. Its presence usually indicates outdated implementation worth updating.
SPF Records Test
94% of top 100 sites passed
This DNS server is not using an SPF record! SPF (Sender Policy Framework) allows administrators to specify which hosts are allowed to send mail from a given domain by creating a specific SPF record or TXT record in the Domain Name System (DNS). You can find more information about SPF records here.

SPF Records Test

How to pass this test?

The Sender Policy Framework (SPF) DNS record lists the mail servers authorized to send email on behalf of your domain. Receiving servers use it to verify that messages claiming to come from your domain are legitimate, which significantly reduces the chance of email being marked as spam. Fixing this issue means publishing an SPF record in your DNS that includes every legitimate sender and ends with a strict policy.

Example

example.com.  TXT  "v=spf1 include:_spf.google.com include:mailgun.org ~all"

Where to make the change

  • DNS provider: add a TXT record at the domain root with the SPF policy. Cloudflare, Route 53, Namecheap, GoDaddy, and similar all expose a TXT record editor.
  • Email providers: Google Workspace, Microsoft 365, and most transactional email services publish their required SPF include directives in their setup documentation.

Common causes and how to resolve them

  • No SPF record at all: add one. Even a minimal record (v=spf1 include:_spf.google.com ~all) is better than nothing.
  • Multiple SPF records: SPF only allows one TXT record per domain. Merge multiple records into a single one with all required include: directives.
  • Policy too permissive: ending with +all authorizes anyone to send as your domain. Use ~all (soft fail) or -all (hard fail) instead.
  • Missing legitimate senders: add an include: for every transactional email service (SendGrid, Mailgun, Postmark) and every marketing platform you use.
  • Too many DNS lookups: SPF caps include lookups at ten. Flatten or consolidate include: chains if you exceed it.

Best practices

  • Pair SPF with DKIM and DMARC: SPF alone is not enough. DKIM signs messages cryptographically; DMARC tells receivers what to do when SPF or DKIM fails.
  • Start with ~all, move to -all: soft fail lets you observe before strict enforcement. Move to hard fail once you are confident no legitimate sender is missing.
  • Test deliverability: tools such as MXToolbox SPF check or Google Postmaster Tools surface SPF problems before users complain.
  • Audit annually: as you add or remove email vendors, the SPF record needs to keep up.
Checks the domain's DNS for a Sender Policy Framework record. SPF lets receiving mail servers verify that messages claiming to come from the domain were actually sent by an authorized mail server, which significantly reduces the chance of legitimate email being marked as spam and protects the domain's sender reputation.
Ads.txt Validation Test
67% of top 100 sites passed
The request of ads.txt file has an unexpected Content-Type header: text/html; charset=UTF-8. In order for this resource to be easily accessed by the DSPs and advertisers, its Content-Type header should be text/plain or text/plain; charset=utf-8.

Ads.txt Validation Test

How to pass this test?

The ads.txt file is a public list of the advertising vendors authorized to sell your inventory programmatically. A correctly formatted ads.txt protects against domain spoofing in the ad supply chain and is required for inclusion in many premium advertising marketplaces. Fixing this issue means publishing a valid ads.txt at the site root with current authorized seller entries.

Example

google.com, pub-0000000000000000, DIRECT, f08c47fec0942fa0
example-ssp.com, 12345, RESELLER
contact=ads@example.com

Where to make the change

  • Raw HTML or static site: upload ads.txt to the site root so it is served at https://example.com/ads.txt.
  • WordPress: use a small plugin or upload the file via FTP. Some advertising plugins manage it automatically based on connected accounts.
  • Shopify: upload the file through the theme code editor as an asset, then expose it at the root via a route configuration.
  • Cloudflare or similar CDN: serve ads.txt from a worker if you do not have file-system access at the origin.

Common causes and how to resolve them

  • File missing: create one with at least your direct advertising relationships.
  • File at the wrong path: ads.txt must be at the domain root, not in a subdirectory.
  • Wrong relationship value: use DIRECT for direct seller relationships, RESELLER for authorized resellers. Other values are invalid.
  • Stale entries: partners change; remove relationships you no longer have so spoofers cannot exploit them.
  • Returning HTML instead of plain text: the file must be served as text/plain. A page that returns HTML or a 404 fails validation.

Best practices

  • Audit quarterly: stale entries are the main source of ads.txt vulnerabilities.
  • Mirror app-ads.txt for mobile inventory: apps use a parallel app-ads.txt file with the same syntax.
  • Add a contact line: include a contact=email@example.com line so vendors can reach the right person about ad-quality issues.
Validates the format of the site's ads.txt file, which publishers use to declare which advertising vendors are authorized to sell their inventory programmatically. A correctly formatted ads.txt protects against domain spoofing in the ad supply chain and is required for inclusion in many premium advertising marketplaces.

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