Image format checker
What is an Image Format Checker?
The Image Format Checker lists every image on a webpage together with its file extension, making it easy to see at a glance which format each image uses (JPEG, PNG, WebP, AVIF, GIF, SVG, etc.).
Why Image Format Matters
- Modern formats compress better — WebP and AVIF typically produce 25-50% smaller files than equivalent-quality JPEG or PNG images.
- Right format for the job — Photos generally suit JPEG/WebP, graphics with transparency suit PNG/WebP, and logos/icons suit SVG for infinite scalability at tiny file sizes.
- Page weight — Images are typically the single largest contributor to total page weight, so format choice has an outsized effect on load time.
Similar tools
Image alt tags checker
Check whether the images on a webpage have alt attributes set.
Lazy loading images checker
Check whether the images on a webpage use native lazy loading.
Website page size checker
Check the total size of a web page, including all resources, for performance analysis.