AVIF Converter — Free, Fast & Private
AVIF usually gives the smallest file of the web formats, but it encodes slowly and many apps cannot open it yet. Everything runs in your browser — nothing is uploaded.
Where AVIF opens
AVIF displays in Chrome 85+, Firefox 93+, Safari 16+ and Edge 85+. Many editors, older Windows apps and upload forms reject it. Keep the original until the destination is confirmed.
Encoding is slower
AVIF encoding is noticeably slower than JPG or WebP and slows with image size. Very large images are scaled down with a note on the result.
Transparency and animation
Transparent sources stay transparent. Animated sources are converted as their first frame; MiniPx does not write animated AVIF.
Choosing a source format
The biggest gains come from large photographs in JPG or PNG. Small images and flat graphics gain less, and can even grow. If you only have a WebP, converting it to AVIF re-compresses already-compressed pixels, so the gain is smaller. Pick the pair that matches your source on the pages linked here.
Check the AVIF before you save
Each row shows the original size, AVIF size, the change and the output dimensions, plus a before and after slider for gradients and fine texture. Batches download as a ZIP.
Specific pairs
WebP to AVIF re-encodes a lossy file. SVG to AVIF rasterises vector art at its declared size. To shrink an AVIF without changing format, use the AVIF compressor.
Converting to AVIF on real files: measured sizes
| File | Before | After | Change | Background |
|---|---|---|---|---|
| 12 MP phone photo | JPG · 4032 × 3024 px · 3.73 MB | AVIF · 4032 × 3024 px · 975.1 KB | 3.9× smaller | — |
| Screenshot (PNG) | PNG · 1280 × 800 px · 88.1 KB | AVIF · 1280 × 800 px · 16.5 KB | 5.3× smaller | — |
| App icon on transparency (PNG) | PNG · 2048 × 2048 px · 162.5 KB | AVIF · 2048 × 2048 px · 10.9 KB | 15.0× smaller | Kept transparent |
| Phone photo as WebP (2016 × 1512) | WebP · 2016 × 1512 px · 784.7 KB | AVIF · 2016 × 1512 px · 480.0 KB | 39% smaller | — |
Measured 2026-10-06 in Chromium 145.0.7632.6 by running this page's converter with its default setting (AVIF) on each file. The photos and scans are CC0 or public-domain files from Wikimedia Commons; the screenshot is MiniPx's own; the app icon is drawn by the measuring script, with a soft shadow so partial transparency is tested; the WebP photo is the phone photo halved and saved as WebP quality 80. Sizes are shown as the tool shows them (1 KB = 1,024 bytes).