Stayput

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Convert AVIF to WebP

An AVIF image as a WebP that more software can open, made on your device.

Convert AVIF images to WebP in your browser, with transparency kept. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The size limit is your device’s memory, and phones hold less; give the page a short while after one visit to save itself for offline use, and then it works offline.

Drop AVIF files hereor click to choose files. Batches welcome.

    Working…

    Done

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    Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.

    WebP is the older, more widely supported sibling of AVIF. Browsers and image editors that open WebP often still cannot open AVIF, so converting is the quick way to use an AVIF picture in a tool that does not know the format yet.

    Your browser decodes the AVIF and writes the WebP itself, with transparency preserved. Safari cannot write WebP on its own, so it fetches a small WebP encoder from this site the first time you save one; the picture is still encoded on your device and never uploaded.

    How it works

    1. Drop your AVIF files onto the page, or tap to pick them. Batches are fine.
    2. Pick a quality. 80 to 90 is a good range for photos; go higher for screenshots with text.
    3. Download each WebP, or all of them as one zip.

    In your browser, not on a server

    Stayput first reads the opening bytes of each file, where every image format writes its signature, so it knows what the file really is whatever it is called. Your browser decodes JPG, PNG, WebP, GIF, BMP, AVIF and SVG itself; TIFF goes through UTIF.js, HEIC through the libheif WebAssembly decoder, and JPEG XL (or AVIF, in a browser without native support) through the Squoosh decoders, all served from this site and cached. The browser re-encodes JPG, PNG and WebP; PDF, ICO, GIF, BMP and TIFF files are written by small encoders in the page. Nothing here needs a server.

    Compared with upload-based tools: Online converters upload your image, convert it on their machine, keep it for hours and cap you at a few files a day. This does the same conversion on your device, for as many files as your device’s memory can hold, with no upload to wait for.

    Verify it yourself. Give the page a short while after one visit to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.

    Questions

    Is transparency preserved?

    Yes. WebP supports an alpha channel, and transparent areas of the AVIF stay transparent.

    Does AVIF to WebP lose quality?

    Both formats are lossy, so the re-encode discards a little detail. At quality 85 to 90 it is hard to see in normal viewing. Keep the original AVIF if you may need it again.

    Does it work in Safari?

    Yes. Safari 16 and later decode AVIF, and the page loads a small WebP encoder from this site the first time you save a WebP. Nothing is uploaded.

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