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.