Image format checker
Image format checker lists image URLs and their file extensions. Review page image references while recognizing that extension names may hide actual formats.
Image format checker: what this tool checks
Image format checker extracts image source URLs from the img elements in a fetched page. It reports the apparent format from each URL's file extension. The list can help you review image naming conventions, identify mixed asset patterns, or prepare a more detailed investigation of image delivery.
How to use it
- Enter the full address of the page containing the images.
- Submit it and review the image URL list and detected extensions.
- Open relevant assets or inspect their response headers when you need to confirm the actual delivered media type.
Understanding your results
This is extension-based detection, not binary file inspection. A URL ending in jpg can deliver another format, while a clean image-service URL may have no extension. The checker uses img src references, so CSS backgrounds, alternative srcset candidates, and sources inserted by JavaScript may be absent.
Frequently asked questions
Does an unknown result mean the image is broken?
No. It may simply have an extensionless URL. Confirm the response and rendered image before treating an unknown extension as a website problem.
Can this tool recommend the best compression settings?
No. It does not inspect visual quality, actual file size, or dimensions. Those decisions require examining the original asset and the context in which visitors see it.
Continue your review
Review image descriptions with the Image alt tags checker, inspect loading attributes through the Lazy loading images checker, and examine asset headers using HTTP headers lookup.
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