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Image Format Checker

Check if your page uses optimal image formats for fast loading

Check Results

This only checks image formats. For a comprehensive analysis, use the full page check.

You can also audit your entire site. Duplicate titles and descriptions, orphan pages, broken links between sections, and other site-wide issues can only be found with a full site audit.

If you don't have an SEO specialist, we can help fix the errors found.

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Why Optimize Image Formats

Images are one of the heaviest elements on a web page. Choosing the right format directly affects loading speed, and speed is one of Google's ranking factors. Modern formats WebP and AVIF compress images 25-50% more efficiently than PNG and JPEG without visible quality loss.

What This Tool Checks

  • Image formats — which formats are used on the page (PNG, JPEG, GIF, SVG, WebP, AVIF)
  • Modern format share — percentage of images in WebP or AVIF
  • Legacy formats — PNG and JPEG images that can be converted
  • <picture> tag — whether the picture element is used to serve different formats
  • SVG graphics — proper use of vector images for icons and logos

WebP and AVIF vs PNG and JPEG

  • WebP — format by Google, supported by all modern browsers. 25-35% better compression than JPEG at the same quality
  • AVIF — newest format based on the AV1 codec. 30-50% better compression than JPEG, but browser support is still incomplete
  • PNG — suitable for images with transparency, but files are significantly heavier than WebP
  • JPEG — classic format for photos, but inferior to WebP and AVIF in compression ratio

How to Switch to Modern Formats

  • Use the <picture> tag with JPEG fallback for older browsers
  • Set up automatic WebP conversion on the server or via CDN
  • Save new images directly in WebP format
  • Use AVIF as an additional format for maximum compression

Frequently Asked Questions

Do all browsers support WebP? ▶
Yes, all modern browsers support WebP: Chrome, Firefox, Safari, Edge, and Opera. Issues may only arise with very old Safari versions (before 14) and Internet Explorer. For such cases, use the <picture> tag with JPEG fallback.
Should AVIF be used instead of WebP? ▶
AVIF provides better compression but isn't supported by all browsers. The optimal approach is to use both formats via the <picture> tag: AVIF as primary, WebP as backup, and JPEG as the final fallback.
Does image format affect SEO? ▶
Format doesn't directly affect rankings, but it affects page loading speed. Speed is a confirmed Google ranking factor (Core Web Vitals). Heavy images slow down LCP — one of the key performance metrics.

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Meta Description Check
Headings Check
Canonical Check
Viewport Check
Open Graph Check
Encoding Check
Image Format Check
Alt Tags Check
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Broken Links Check
Structured Data Check
Compression Check
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URL Structure Check