Which Format Is Smallest
Tries every modern format at the same visual quality and tells you which wins for this picture.
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How to use this tool
- Add your files — drag them onto the page or choose them. They stay on your device.
- Pick how closely the encodes should match the original — Visually identical is the fair test.
- The tool encodes the same picture into JPG, WEBP and AVIF and ranks the results by size in a table you can download any row from.
- Press “Compare formats” and download the results, individually or as one ZIP.
About this tool
Tries every modern format at the same visual quality and tells you which wins for this picture. Everything is analysed and produced on your own device — nothing is uploaded anywhere, and you can verify it: the tools keep working even offline.
Privacy & limitations
The shootout re-encodes one picture at a time and its ranking is per-picture: the winner for a screenshot is often the loser for a photograph.
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Frequently asked questions
Which image format is smallest?
It depends on the picture, which is why this exists. Photographs usually favour WebP or AVIF over JPEG; flat graphics and screenshots often behave differently. The only reliable answer for one image is to encode it every way and compare, which takes under a second here.
How is the comparison fair?
Each format gets its own quality search rather than a shared number, because quality 80 means something different in each of them. They are matched on the *result* — the same measured fidelity against your original — so the sizes are comparable.
Why is AVIF sometimes unavailable?
Most browsers can display AVIF but cannot write it. The tool reports that rather than silently leaving it out, since the answer "your browser cannot make this" is useful.
Which one should I actually use?
The winner, unless you need to support something old. WebP is supported everywhere that matters now; AVIF is smaller again but slower to encode and not universally writable.