Why is my WebP image not opening
Tools Nimbus is a free, no-signup developer toolkit that runs entirely in your browser, so your data is never uploaded to a server. A .webp file that will not open is rarely damaged. The format is newer than the app you are opening it with, or the file was renamed rather than converted. Update the viewer, or convert the file to PNG or JPG with the Tools Nimbus Image Format Converter.
Last updated August 2026
Start by confirming what the file actually is
Before installing a codec or blaming the download, check the bytes. A WebP file begins with the ASCII characters RIFF, then a four-byte length, then WEBP. That signature is what a decoder looks at, and it does not care what the filename says.
file photo.webp
# photo.webp: RIFF (little-endian) data, Web/P image
xxd -l 16 photo.webp
# 00000000: 5249 4646 2c3a 0000 5745 4250 5650 3820 RIFF,:..WEBPVP8Three outcomes, and each one sends you somewhere different. If you see the RIFF and WEBP markers, the file is genuinely WebP and the problem is your viewer. If you see something else, such as JPEG image data or PNG image data, the file was renamed and the extension is lying about the contents. If the command reports data or the file is a few hundred bytes when it should be megabytes, the download was truncated and no converter will rescue it. On Windows without those tools, open the file in a browser tab: a browser that renders it has proved the file is valid.
Symptoms, causes and fixes
| Symptom | Most likely cause | Fix |
|---|---|---|
| Photos or Explorer shows a blank or generic icon | No WebP decoder installed for the shell | Install WebP Image Extensions, or convert to PNG |
| Opens in a browser but in no desktop app | The browser has its own decoder; the app predates the format | Update the app, or convert the file once |
| Editor reports an invalid or corrupt JPEG | A WebP renamed to .jpg | Convert the pixels; renaming back changes nothing |
| Only the first frame appears | Animated WebP in a viewer that decodes stills only | View in a browser, or export to GIF or MP4 |
| Transparent areas turn black or white | Alpha channel dropped by the target format or viewer | Convert to PNG, which keeps alpha; JPG cannot |
| Upload form refuses the file | Extension or MIME allowlist that predates WebP | Convert to PNG or JPG before uploading |
| Half the image renders, then grey | Truncated or interrupted download | Download again; the bytes are incomplete |
| Fine on your machine, broken on a colleague's | Different app versions, not a file problem | Send a PNG or JPG when the recipient is unknown |
Cause 1: the app is older than the format
This is the common case. WebP arrived in 2010 but desktop software adopted it slowly and unevenly, so support depends on which application you double-clicked and which version of it you have. Browsers were first and are now universal, which is exactly why the file reached you: the site that served it checked your browser, not your image editor.
Roughly where support stands as of 2026:
| Application | WebP support |
|---|---|
| Chrome, Edge, Firefox, Safari | Yes, for years, including animation |
| Windows 11 Photos and Paint | Yes in current versions, no extension needed |
| Windows 10 Photos and File Explorer | Only with WebP Image Extensions from the Microsoft Store, on build 1809 or later |
| macOS Preview and Quick Look | Yes since Big Sur |
| Adobe Photoshop | Yes natively since version 23.2, February 2022; earlier versions need a plugin |
| Microsoft 365 apps on Windows | Insert works in recent builds, and on Windows 10 it relies on the same store extension |
| Older viewers and thumbnailers | Frequently not, and they usually fail silently |
| Upload forms and print services | Varies wildly; assume no unless the page says otherwise |
Two practical consequences. First, updating the application is the durable fix when you control the machine. Second, when you are sending a file to someone whose software you cannot see, WebP is the wrong choice no matter how much smaller it is. PNG and JPG open everywhere.
Cause 2: the extension does not match the bytes
Renaming a file changes the label, never the contents. This trips people up in both directions. A WebP renamed to .jpg makes strict decoders report a corrupt JPEG, while lenient ones sniff the header and open it anyway, which is why the trick seems to work often enough to keep spreading. A JPEG renamed to .webp confuses the opposite set of tools.
The reverse case is worth knowing too. If your browser downloaded a file as .webp when the page looked like an ordinary photograph, nothing malfunctioned. Sites commonly negotiate the image format per request and send WebP to any browser that advertises support, so Save image as writes the bytes that were actually served. The fix is a real conversion, which rewrites the pixel data into the target format and gives the file an extension that tells the truth. The Image Format Converter does this through the Canvas API in your own browser, so the image is never uploaded to a server, which matters when the picture is a screenshot of something private.
Cause 3: animation and transparency
WebP carries two features that its replacements handle differently, and both produce confusing part-failures rather than clean errors.
- Animation. Decoding a WebP and playing an animated one are separate capabilities. Plenty of viewers do the first and not the second, so you get a still first frame with no warning. Converting an animated WebP to PNG or JPG keeps that first frame and discards the rest, permanently. If the motion matters, keep the WebP for browser viewing or export to GIF or MP4 with a video tool.
- Transparency. WebP supports an alpha channel, and so does PNG, so that conversion preserves see-through areas. JPG has no alpha at all, so transparent pixels have to become some solid color, normally white. A logo that arrives with an unexpected white box behind it went through a JPG step somewhere. Convert to PNG when the background must stay transparent.
Cause 4: the file is incomplete
Rarer, but it looks alarming and is easy to confirm. An interrupted download or a partial copy off a flaky drive gives you a file that starts with a valid WebP header and then stops. Browsers tend to render what they can and leave the remainder grey, while stricter decoders refuse the whole file. Compare the size against the source if you can, and download it again. No converter can reconstruct bytes that never arrived.
Converting one, and choosing the target
For a one-off file the fastest route is a browser-based converter, since every browser already contains a WebP decoder. Open the Image Format Converter, pick the file, choose PNG or JPG, and download the result. Nothing is uploaded, which is the practical reason to prefer a local tool over a site that wants your file on its server first.
Which target to pick:
- PNG when the image has transparency, contains text or sharp edges, or will be edited further. It is lossless, so it adds no new artifacts, but the file will usually be noticeably larger than the WebP was.
- JPG for photographs headed somewhere with a size limit or an old uploader. It re-compresses, so keep the quality high if the image will be edited again. JPG vs PNG covers the trade-off in more detail.
- Keep the WebP when the destination is a modern browser. It is genuinely smaller at the same visual quality, and converting away from it for no reason costs you that.
If the converted PNG turns out too heavy for an email or an upload cap, run it through the Tools Nimbus Image Compressor rather than reaching for a lower-quality conversion.
A checklist
- Run
fileon it, or open it in a browser tab, to prove the bytes are really WebP. - If a browser renders it and your app does not, the app is the problem, not the file.
- On Windows 10, install WebP Image Extensions; on Windows 11, update Photos and Paint.
- Update Photoshop to 23.2 or later rather than hunting for a plugin.
- Never rename to change format; convert instead.
- Convert to PNG to keep transparency, JPG for maximum compatibility.
- Check the size against the source if the image renders only halfway.
- Send PNG or JPG when you do not know what the recipient can open.
For a related asset that fails just as quietly in the wrong format, see why is my favicon not showing, or read JPG vs PNG before picking a conversion target. All of our Tools Nimbus guides are indexed on one page.