Why convert JPG to AVIF
AVIF typically stores the same photograph in 30–50% fewer bytes than JPG at matched visual quality, because it uses compression developed decades later. JPG was standardised in 1992 and has served the web well, but the maths behind it has been comprehensively improved on since.
That saving is not free: AVIF takes noticeably longer to encode. You pay that cost once, when you convert, and every visitor afterwards downloads the smaller file. On a gallery or a product catalogue the arithmetic is straightforward.
One honest caveat. A JPG is already lossy — detail was discarded when it was first saved, and re-encoding cannot bring it back. What AVIF does is store what remains far more efficiently. At quality 70–85 the result is visually indistinguishable from the JPG you started with, at a fraction of the weight.
Convert JPG to AVIF in three steps
- Drop your JPG files inDrag one photo or an entire shoot onto the converter above. Files load straight into your browser — there is no upload step to wait through.
- AVIF is already selectedOutput is set to AVIF. Quality 75 suits most photographs; push to 85 for hero images you want pristine.
- Download your AVIFTake a single file, or export the whole batch as a ZIP with original filenames preserved.
JPG vs AVIF
| JPG | AVIF | |
|---|---|---|
| Compression | 1992-era, less efficient | Modern, 30–50% smaller |
| Transparency | No | Yes |
| Encoding speed | Very fast | Slower — it works harder |
| Browser support | Universal | All current browsers |
| Best for | Legacy compatibility | Web delivery, speed |
Keep a JPG copy for anywhere that still demands one. Serve AVIF on your own site, where the bandwidth saving is yours to keep. Need the wider-compatibility middle ground instead? Try JPG to WebP.
Nothing you convert leaves this page
Most converters upload your images to a server, process them there, and hand back a download link. Compressly does not. The libavif encoder is compiled to WebAssembly and runs on your own machine, so a client asset, an unreleased product shot, or a screenshot with something private in it never travels anywhere. There is also no queue and no upload cap set by someone else's bandwidth.
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Questions
Is AVIF really smaller than JPG?
Yes — at matched visual quality AVIF is usually 30–50% smaller than JPG. The gain is largest on detailed photographs and smallest on very small images, where format overhead matters more.
Will converting JPG to AVIF lose quality?
A JPG is already lossy, so a re-encode discards a little more in theory. At quality 75–85 the AVIF is visually indistinguishable from the source while being substantially lighter.
Why does conversion take a few seconds per image?
AVIF searches much harder for redundancy than JPG does, which is precisely why the output is smaller. Compressly spreads the work across several parallel workers to keep batches quick.
Can I convert a whole folder at once?
Yes. Drop them all in and download the results as one ZIP. The free tier handles 20 files per batch at 25 MB each; Pro removes the batch limit and raises the cap to 200 MB.
Are my photos uploaded anywhere?
No. Conversion runs inside your browser via WebAssembly. Your files never touch a server — you can verify it in the Network tab of your browser DevTools.