Convert AVIF to WebP
Free, unlimited AVIF to WebP conversion that runs entirely inside your browser. No upload, no sign-up, no watermark.
Convert your AVIF files to WebP
or drop them here, or paste with Ctrl+V · files never leave your device
Settings
Nothing queued yet. Add as many files as you like — everything runs on your own device.
Nothing is uploaded
Conversion runs in your browser. Your files never touch a server, so there is no copy of them to leak.
No sign-up, no watermark
No account, no email, no daily limit, and nothing stamped across your image.
Batch and folders
Drop a hundred files at once and download the results as a single ZIP.
Works offline
Once this page has loaded you can disconnect entirely and it still works.
This converter turns AVIF images into WebP files without uploading anything. The conversion runs inside this page using your own device's processor, so your photos never leave your computer — there is no server copy to worry about, no queue to wait in, and no limit on how many files you convert.
AVIF is a modern format built on the AV1 video codec, producing the smallest files of any widely supported image format. All current browsers decode AVIF. Outside the browser, support is still thin — which is usually why you need it converted. WebP, by contrast, excellent in browsers, poor outside them. This mismatch is why "save image" so often lands you a file nothing else will open.
AVIF turns up when you save an image from a site that has modernised its delivery. Browsers handle it fine, but nearly everything else — desktop editors, office software, print services — does not. WebP is the pragmatic choice when the file has to leave the browser.
How to convert AVIF to WebP
- Add your AVIF files. Drag them onto the box above, click to browse, or paste an image straight from your clipboard. You can add as many at once as you like.
- Adjust the settings if you need to. The defaults suit most images. Raise the quality slider if the image contains text or flat colour.
- Download the WebP file. Each file gets its own download button as soon as it finishes, and you can pull the whole batch down as a single ZIP.
What changes when you convert AVIF to WebP
Every format conversion involves trade-offs, and vague tools hide them. Here is exactly what happens to your image in this particular conversion.
- Transparency is preserved: both AVIF and WebP carry a full alpha channel.
- Both formats are lossy, so the file is being re-compressed. We decode AVIF at full fidelity and re-encode once at your chosen quality, which keeps generational loss to a minimum, but converting back and forth repeatedly will visibly degrade an image.
What happens to the file size
Measured, not estimated: two 1200 x 800 pixels references — a photograph and a flat-colour graphic — put through this converter.
| Reference image | As AVIF | As WebP | Change |
|---|---|---|---|
| Photograph | 104 KB | 139 KB | +34% |
| Graphic with text | 4 KB | 8 KB | +134% |
Yours will differ: size depends more on what is in the picture than on the formats involved.
About AVIF (AV1 Image File Format)
AVIF is a modern format built on the AV1 video codec, producing the smallest files of any widely supported image format.
Where you probably got it: Downloaded from a modern website that serves next-gen images.
Strengths
- Typically 30–50% smaller than JPG at visually identical quality
- Handles transparency, HDR and wide colour gamut
- Royalty-free and supported in all current browsers
Limitations
- Encoding is computationally expensive — noticeably slower than JPG or PNG
- Very little support outside browsers: most desktop and print software cannot open it
- Can smear fine texture at aggressive settings
About WebP
WebP is Google’s web image format, offering roughly 25–35% smaller files than JPG at comparable quality.
Support: Excellent in browsers, poor outside them. This mismatch is why "save image" so often lands you a file nothing else will open.
Strengths
- Noticeably smaller than JPG and PNG at matching quality
- Does both lossy and lossless, and supports transparency in either mode
- Supported by every current browser
Limitations
- Older desktop software, printers and photo kiosks often reject it
- Many websites, job portals and government forms still refuse .webp uploads
- Windows Photo Viewer and older Office versions cannot open it
Is it safe to convert AVIF online?
Here, yes — and you can check rather than trust. Open your browser’s developer tools, switch to the Network tab and convert a AVIF file: no request carrying your image is made. Disconnect from the internet after this page has loaded and the converter still works, which would be impossible if a server were doing the conversion.
That is worth verifying wherever you convert, because most online converters do upload, and AVIF files are so often personal photos and documents people would not hand to a stranger. Once a file is on somebody else’s server you are relying on a privacy policy rather than on anything you can observe. We wrote up how to tell a safe converter from a risky one in more detail.
Frequently asked questions
How do I convert AVIF to WebP?
Drag your AVIF file onto the box above, or click it to browse. The conversion starts immediately in your browser and the WebP download appears within a second or two for most images. You can drop in a whole folder of files at once and download them together as a ZIP.
Are my AVIF files uploaded to a server?
No. The conversion happens locally in your browser, so your files are never transmitted anywhere — the tool even works with the network disconnected once the page has loaded. That is also why there is no file size or file count limit: nothing costs us anything per conversion. The practical ceiling is your own device's memory, which on a phone means very large images may fail.
Will converting AVIF to WebP reduce the quality?
A little. Both formats are lossy, so the image is decompressed and re-compressed once. We decode at full fidelity and encode a single time at your chosen quality, so a one-off conversion is close to invisible — but avoid converting the same image back and forth repeatedly.
What is the difference between AVIF and WebP?
AVIF is a modern format built on the AV1 video codec, producing the smallest files of any widely supported image format. WebP is Google’s web image format, offering roughly 25–35% smaller files than JPG at comparable quality. In practice the choice comes down to compatibility: all current browsers decode AVIF. Outside the browser, support is still thin — which is usually why you need it converted. Meanwhile excellent in browsers, poor outside them. This mismatch is why "save image" so often lands you a file nothing else will open.