WebP was the size-saving upgrade of the 2010s; AVIF is the current one. If you already migrated a site's images to WebP, you squeezed roughly 25–35% out of your old JPEGs — and AVIF can usually go meaningfully further, particularly on photographic content and at aggressive compression levels where the AV1 encoder pulls ahead. With native AVIF support now in Chrome, Firefox, Safari, and Edge, the last practical reason to stop at WebP has largely disappeared.
The two formats are close relatives in capability, which makes this a low-friction conversion. Both support transparency, so alpha channels carry straight through — a transparent WebP badge or product cutout comes out as a transparent AVIF. Both are lossy at web settings; the quality slider here defaults to 55, which on AVIF's scale keeps typical images visually identical to their WebP source while still trimming the size. Where you should slow down and inspect the result is content with hard edges — flat-color graphics or small text — since any lossy re-encode can soften lines; a quick look at full zoom settles it.
Like every converter on Convertmaxxing, this one processes files locally. WebAssembly builds of the decoder and encoder run in your browser tab, meaning nothing is uploaded, nothing is retained, and no account stands between you and the download. That matters more than it might seem — feeding a site's entire asset library to a random conversion server is real exposure, and here that step simply does not exist. It is free, and the engine — a one-time download of about 5 MB — is cached by your browser, so later conversions start instantly.
Set expectations on two points before you begin. AVIF encoding is slow relative to other formats — AV1 spends serious computation to hit its compression numbers, so a large image takes a while. And animated WebP is not supported yet; this conversion handles still images, so animated files should stay in their current format for now.
Why convert WebP to AVIF?
- AVIF typically compresses further than WebP, so already-optimized assets get smaller again
- Transparency carries over — both formats have full alpha channels, so cutouts and badges need no rework
- Every current major browser renders AVIF natively, making the switch production-safe
- Local WebAssembly conversion: your files never touch a server, with no cost and no signup
How it works
- Step 1
Drop your files
Drag your WebP files into the converter above, or click “Choose files”. Batches are welcome.
- Step 2
Pick your settings
AVIF is preselected. Adjust quality or size if you want, or keep the defaults.
- Step 3
Convert and download
Conversion runs locally in your browser. Download files individually or grab everything as a zip.
Frequently asked questions
- If I convert a whole folder of site assets, is anything sent to your servers?
- Nothing, ever. The converter has no upload step — encoding happens in your browser through WebAssembly, file by file, entirely on your machine.
- Is it worth converting WebP to AVIF, or are the gains marginal?
- It depends on the content. Photographic images and complex textures usually shrink noticeably at equal visual quality; simple flat graphics that WebP already compressed extremely well may improve only modestly. Convert a few representative files and compare sizes before committing to a full migration.
- Will transparent areas in my WebP stay transparent?
- Yes. AVIF supports an alpha channel just as WebP does, so transparency converts intact rather than being flattened onto a background.
- What about animated WebP files?
- Animated conversion is not supported yet, so this tool handles still WebP images only. Keep animated files in their current format for now.
- Why does encoding take longer than converting to WebP or JPEG would?
- AVIF sits on top of the AV1 video codec, which was designed to maximize compression at the cost of encode time. A big image can take a while to finish — that is expected behavior, not a stall.