Convert JPG images to AVIF locally - much smaller files at the same quality, no upload.
Running locally on your device ...
0%
Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
AVIF is a modern format that often stores photos noticeably smaller than JPG at the same quality - ideal for fast websites and lean storage. Modern browsers display AVIF natively.
The JPG is decoded locally (including correct EXIF orientation) and encoded as AVIF with a self-hosted codec. The quality slider controls the file size. Nothing is uploaded.
The biggest win comes when serving photos on a website: smaller files mean faster load times, a better Core Web Vitals score and less data usage for mobile visitors. The conversion only makes sense, though, if your audience uses modern browsers - ideally ship AVIF with a JPG fallback in the picture element so no visitor sees a broken image. Note as well that while AVIF compresses again, the typical JPG artefacts from the first compression remain.
| Input formats | JPG, JPEG |
|---|---|
| Output format | AVIF |
| Batch processing | Yes |
| Processing | Locally in your browser (WebAssembly) |
| File upload | None |
Limitations: AVIF cannot recover detail JPG already discarded, but it stores the image more compactly. Older programs may not open AVIF. Very large images need time and memory.
Depending on content and quality, often 30-50 percent smaller than a comparable JPG.
No. Lost JPG detail does not return; AVIF only stores more efficiently.
No, everything runs locally in the browser.
Yes, download individually or as a ZIP.