Processed entirely on your device — nothing is uploaded
How to use the avif to webp converter
- 1Drop your AVIF files onto the box above, or click to browse for them.
- 2Adjust the quality slider if you want a smaller file or a sharper result.
- 3Press Convert and wait while your browser re-encodes each image.
- 4Download the finished WebP files.
Why convert AVIF to WebP?
A modern format derived from the AV1 video codec, delivering the smallest files of any widely-supported image format. That is exactly what you want when the file is being archived or edited, and an obstacle when it has to be emailed, uploaded or served on a web page. WebP solves the second problem.
Google's web-first format that offers both lossy and lossless modes plus transparency in a single container. For a AVIF source specifically, the payoff is typically 25-35% smaller than JPEG at visually equivalent quality — and alongside that, supports transparency and animation, which JPEG cannot do at all and supported by every browser released since 2020, making it safe for production websites.
The cost of the switch is worth stating plainly before you make it: some desktop software, older printers and a few social platforms still refuse WebP uploads and lossy WebP is still lossy — re-encoding an already-compressed image compounds the damage. Weigh that against what AVIF was giving you, which was roughly 50% smaller than JPEG and 20-30% smaller than WebP at matched quality.
Where AVIF files usually come from
Most people arrive at this page holding one of three things: images saved from a performance-focused site that serves AVIF to capable browsers, exports from a modern static site build pipeline, or photos returned by a CDN doing automatic format negotiation.
Knowing which one you have matters, because it changes the right settings. Photographic content tolerates aggressive compression well — the eye is forgiving about noise in a sky or a skin tone. Screenshots, charts and line art do not: they contain hard edges and small text, which is precisely what lossy compression handles worst. If your AVIF is the second kind, push the quality slider higher than feels necessary.
AVIF originated in performance-focused websites and modern CDNs, and that lineage explains most of its behaviour: a modern format derived from the AV1 video codec, delivering the smallest files of any widely-supported image format.
What happens to quality when you convert AVIF to WebP
Both AVIF and WebP are lossy, so this is a re-encode: the file is decoded back to raw pixels and then compressed again by a different algorithm with different priorities. Each such round trip compounds the artefacts left by the last, an effect called generation loss. One conversion is almost always fine. Converting back and forth repeatedly is what visibly destroys an image.
Set the quality slider slightly higher than you think you need — 85 to 92 is the sensible band for a AVIF source. Compressing an already-compressed image at a low setting is the fastest route to visible mush.
Transparency survives intact. Both AVIF and WebP carry an alpha channel, so cut-out logos and images with soft, feathered edges convert without picking up a background.
If your AVIF is animated, only the first frame is converted — WebP here is a still-image output. Use a video tool if you need the whole sequence.
How much smaller (or larger) will the file be?
AVIF is the most efficient of the widely-supported formats, so almost any conversion out of it increases file size — typically 1.5 to 2x for WebP at matched quality. Again, the reason to do this is compatibility, not efficiency.
The quality slider is your main control. Dropping from 92 to 80 typically halves the file for a difference most people cannot see at normal viewing distance. Below 70, artefacts become obvious on skin tones, skies and any smooth gradient. If you are unsure, convert once at 85 and look at the result before going lower.
When converting AVIF to WebP is the wrong move
This conversion is not always the right answer, and it is cheaper to know that now than after you have replaced your originals. Skip it if the destination is a printer, a government upload portal or older desktop software, several of which still reject WebP outright and the animation matters, since only the first frame comes across.
A reasonable default: keep your AVIF originals in a folder you do not touch, and treat the WebP output as a derived, disposable copy for whatever you are publishing or sending. That way a bad quality setting costs you a re-export rather than the image.
Your AVIF files never leave your device
Ask what actually happens to a file you drop into a typical converter and the answer is: it travels across the internet to a machine you do not control, and stays there for a while.
This converter does not work that way. Your AVIF is decoded by the browser's own image pipeline, drawn into an off-screen canvas, and re-encoded as WebP — all inside this tab, on your processor. There is no upload progress bar because there is no upload, no queue because there is no server, and nothing to delete afterwards.
If you want to check, the network tab in your browser's developer tools will show no upload request at any point during the conversion. A practical side effect is that speed depends on your own hardware rather than on someone else's server load, and there is no file size cap beyond your available memory.
Frequently asked questions
Is this AVIF to WebP converter really free?
Yes — no account, no watermark, no daily cap. The conversion runs on your own processor, so it costs nothing to serve and there is nothing to meter.
Are my AVIF files uploaded anywhere?
No. The file is read locally, decoded into a canvas and re-encoded to WebP entirely within this browser tab. No image data crosses the network at any point.
Can I convert several AVIF files at once?
Yes. Drop in as many as you like and each is converted with the same settings, one at a time so a large batch does not exhaust your memory.
What happens to my animated AVIF?
Only the first frame is converted, because the output here is a still image. To keep the motion you need a video or animation tool rather than an image converter.
Will WebP work everywhere?
Every browser released since 2020 displays WebP, so it is safe for websites. Some desktop applications, older printers and a few upload forms still reject it — use JPG or PNG if you hit one.
Why can I not save back to AVIF?
Browsers can decode AVIF but cannot yet encode it through the canvas API. Reading AVIF works everywhere modern; writing it needs a WebAssembly encoder, which is on the roadmap here.
Does the converter change my image dimensions?
Not unless you ask. Output keeps the exact pixel dimensions of the source; the max-width box is empty by default and only resizes when you fill it in.