Convert AVIF to WebP — Free, Fast & Private
WebP opens in more places than AVIF and also keeps transparency, which is why this is the usual step back from AVIF. Everything runs in your browser — nothing is uploaded.
Two lossy formats, one more pass
AVIF is decoded and re-encoded as WebP, so you add a second round of loss, and WebP is often the larger of the two. The measured table below shows real sizes. For other targets see AVIF to JPG and AVIF to PNG.
Transparency is kept
Both formats carry an alpha channel; the output WebP stays transparent where the AVIF was.
A real WebP on every browser
Safari cannot write WebP from a canvas, so MiniPx uses its own WebAssembly WebP encoder; the file is a genuine WebP. WebP displays from Safari 14.
Animated AVIF
An AVIF image sequence becomes a still from the first frame, with a notice. MiniPx does not write animated WebP.
Why people make this conversion
AVIF files saved from the web often will not open in editors, messaging apps or older systems. WebP is accepted in far more places while still being a compact, transparency-capable format, so it is a practical bridge. If the destination still refuses WebP, use JPG or PNG instead.
Check the WebP against the AVIF before you save
Each row shows the AVIF size, the WebP size and the change, with a before and after slider. Expect the WebP to be larger than the AVIF in most cases; the card marks growth in amber.
More WebP options
See the WebP converter for every WebP direction.
AVIF to WebP on real files: measured sizes
| File | Before | After | Change | Background |
|---|---|---|---|---|
| Phone photo as AVIF (2016 × 1512) | AVIF · 2016 × 1512 px · 646.9 KB | WebP · 2016 × 1512 px · 598.0 KB | 8% smaller | — |
| Screenshot as AVIF | AVIF · 1280 × 800 px · 19.7 KB | WebP · 1280 × 800 px · 28.1 KB | 42% larger | — |
| App icon as AVIF (transparent) | AVIF · 2048 × 2048 px · 19.4 KB | WebP · 2048 × 2048 px · 79.0 KB | 4.1× larger | Kept transparent |
Measured 2026-10-07 in Chromium 145.0.7632.6 by running this page's converter with its default setting (WebP) on each file. The photos and scans are CC0 or public-domain files from Wikimedia Commons; the screenshot is MiniPx's own; the AVIF photo is the phone photo halved and saved as AVIF quality 60; the screenshot AVIF is MiniPx's own screenshot saved as AVIF quality 60; the transparent AVIF is the measuring script's app icon saved as AVIF quality 60. Sizes are shown as the tool shows them (1 KB = 1,024 bytes).