Convert WebP to AVIF
WebP already cut your image sizes once — AVIF usually shaves another slice off the top. At similar visual quality, AVIF files commonly land 20–40% below the equivalent WebP, and transparency carries through, which adds up quickly across a high-traffic site. This tool converts WebP to AVIF entirely in your browser: it decodes the WebP with your browser's own image engine, then encodes AVIF with the libaom encoder compiled to WebAssembly. Honest and important: the AVIF encoding step is WASM-based, not a built-in browser transcoder — everything still runs locally, with no uploads, no server, no watermarks, no usage limits, and it works offline once the encoder has loaded. The quality slider (default 50%) guides the size/quality balance. Two truthful caveats: both formats are lossy, so converting can't recover detail the original WebP already discarded — it only re-wraps what's there, and at low quality watch for banding on smooth gradients. Very old software still prefers JPG or PNG, so keep originals where maximum compatibility matters.
Drop WebP files here or click to browse
Processed locally — files never leave your device
How to use
- Drop your .webp files into the box, or click it to browse.
- Set the quality slider (50% is a good default).
- The AVIF encoder (WebAssembly) runs locally on your device.
- Download the .avif files.
Frequently asked questions
Why convert WebP to AVIF?
AVIF typically beats WebP by 20–40% at similar visual quality while also supporting transparency — for image-heavy pages, that's another meaningful slice off total page weight.
Are my WebP files uploaded?
No. WebP decoding uses the browser's built-in image engine and AVIF encoding runs as WebAssembly in your tab. Nothing is transmitted, and it works offline once loaded.
Is transparency kept?
Yes. AVIF supports an alpha channel, so transparent WebP logos and overlays keep their transparency after conversion.
Will conversion recover quality lost in the WebP?
No — the original WebP was already lossy, and re-encoding can only re-wrap the decoded pixels. If the source looks soft or banded, the AVIF will look the same, just smaller.
Can every app open AVIF?
Current Chrome, Firefox and Safari (16+) display AVIF, so it's safe for modern web use. Some older editors and legacy software still prefer WebP, JPG or PNG — keep originals for those cases.
Related tools
Starting from JPG or PNG? Use JPG to AVIF or PNG to AVIF. Need to decode AVIF back to a common format first? AVIF to JPG (PNG output option included) or AVIF to JXL — then re-encode to WebP with JPG to WebP if you want WebP out. Going the other way, WebP to JPG keeps WebP files convertible everywhere.