Check If an Image Is a WebP
Read a file's real bytes to confirm whether it is a true WebP. Runs entirely in your browser, so your data never leaves your device.
Drop a file here, or click to browse
Files never leave your device
Output
The result appears here as you type.
How to use Check If an Image Is a WebP
- 1. Upload the file in question. Drop in the file you want to check, regardless of what extension it currently has. The tool reads the raw byte structure instead of relying on the name.
- 2. See the container check. The tool looks for the RIFF container header followed by the WEBP identifier that every genuine WebP file carries near the start of the file.
- 3. Read the verdict. Note the yes-or-no result, which also names the real format found when the file turns out mislabeled, such as a PNG saved under a .webp extension.
When to use Check If an Image Is a WebP
Check If an Image Is a WebP reads a file's actual RIFF and WEBP header bytes to confirm whether it genuinely is a WebP image. It settles the question when a file's extension cannot be trusted, such as after a download, rename or bulk conversion.
- Validating assets before a build. A site build pipeline expects every asset in a webp folder to actually be WebP for its optimization step to work. Checking each file first prevents a mislabeled PNG from breaking the build.
- Auditing a bulk-converted image set. A batch conversion tool claimed to output WebP for hundreds of images, but a handful look suspiciously large. Checking their real signatures reveals which ones the conversion silently skipped.
- Investigating a browser compatibility bug. An image that should be WebP renders incorrectly in an older browser. Checking its actual bytes confirms whether the file truly is WebP or was mislabeled during an earlier export step.
Examples
Renamed file
Input
image.webp (actually a PNG)
Output
No — it looks like a PNG file.
About the Check If an Image Is a WebP tool
Check If an Image Is a WebP does its work locally, right in the browser. Read a file's real bytes to confirm whether it is a true WebP. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Image Tools collection on EditSafely, a set of 200 small, focused Image utilities that share the same instant, private workspace.
There is nothing to configure. Provide the input and the result appears on its own. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Check If an Image Is a WebP free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Are my files uploaded to a server?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
Which files does Check If an Image Is a WebP accept?
It accepts images in any common format (PNG, JPG, WebP, GIF and more). There is no file size cap imposed by a server; very large files are limited only by your device's memory.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.