ALL IMAGE TOOLS56
AVIF to WebP
Convert AVIF to WebP Online — Free & Instant
Move a modern format into the modern format far more software will open.
About AVIF to WebP
AVIF and WebP are both modern formats, so this is not a conversion out of the past — it is a conversion sideways, into the one more software will actually open. WebP has been in every major browser since 2020 and is read by design tools, content systems, chat apps and phone galleries that still show an AVIF as a broken thumbnail. Your browser decodes the AVIF (Chrome 85+, Firefox 93+ and Safari 16.4+ all can) and the Canvas API encodes the WebP. Be clear about what that costs. Both formats are lossy, so what comes back is a second generation: the AVIF is decoded to pixels — artifacts and all — and those pixels are compressed again by a different codec, which cannot recover detail and will add a little of its own. The quality slider governs the second pass only; the first one is already baked into the file you brought. Converting back to AVIF later will not undo any of it. Transparency does survive, because WebP carries an alpha channel, and the pixel dimensions are unchanged. If the destination accepts AVIF, the honest advice is not to convert at all — an AVIF is usually the smaller file. Batch conversion is supported. Everything happens in this tab, and no image is uploaded.
Questions
Why convert between two modern formats?
Because compatibility is not the same as modernity. WebP arrived a decade before AVIF and is read by essentially every browser, most image editors, the major messaging apps and a long tail of upload forms; AVIF is still refused by plenty of them. This is the conversion you want when the file has to go somewhere AVIF is rejected and you would rather not fall all the way back to JPG.
Is this a second generation of loss?
Yes, and it is worth saying plainly. AVIF is lossy and WebP is lossy, so the encoder here is deciding what to discard from a picture that has already had detail discarded by a different encoder with a different model. You do not get the better of the two; you get the damage from both. Set the quality high and do it once from the best source you have, rather than repeatedly.
Which format produces the smaller file?
AVIF, in general — it is the newer codec and the more efficient of the two at the same visual quality. So expect the WebP to be the larger of the two at a comparable setting, and treat any saving as a bonus rather than the reason to convert. Rather than average anybody's benchmark, the page prints the IN and OUT sizes for the file you actually dropped.
Does my browser need to support AVIF for this to work?
Yes. The decode is your browser's — Chrome (85+), Firefox (93+) and Safari (16.4+) all do it — and nothing here can substitute for it. The encode is the browser's too: writing WebP has been supported far longer and far more widely, so in practice the input side is the one that decides whether the conversion runs.
Does transparency survive?
Yes. Both formats carry a full alpha channel, so a transparent AVIF comes out as a transparent WebP and nothing is flattened onto a background. That is the main practical advantage over converting to JPG, which has nowhere to store an alpha channel at all.
Is my file uploaded to a server?
No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.