seo site checkup logo
PricingFree ToolsArticles

Modern Image Format Test

What is it?

This test will check if the webpage is serving images in modern formats. Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption for users.

Pass rate:

  • Top 100 websites: 38%
  • All websites: 28%
Pass rates of Top 100 US websites











How do I fix it ?

In order to pass this test, convert all the images listed in this report into a modern image format such as JPEG 2000, JPEG XR or WebP.

It's important to understand that the modern image formats, like WebP, are not yet widely supported across all devices and browsers. You can find here a full list of supported browsers and devices for the WebP format.

If your target audience falls within one of the unsupported browser/device categories, you should serve optimized fall-back images in the original JPEG/PNG format so that your users don't see a broken or badly designed page:

<img src="image.jpg" alt="">

	<source type="image/webp" srcset="image.webp">
	<img src="image.jpg" alt="">

The browser uses the first listed source that's in a format it supports. If the browser does not support any of the formats listed in the "source" tags, it falls back to loading the image specified by the "img" tag.

Check your website's SEO for free right now!

seo site checkup logo
Website SEO, Monitoring & Automation Made Easy.
  • Pricing
  • Free Tools
  • Articles
  • Login
  • Free 7-Day Trial
© SEO Site Checkup 2020-2024 • All rights reserved