Convert JPG to AVIF

Convert JPG to AVIF online, free and 100% in your browser. No upload, no signup. All the work happens on your device, so files can be as large as it can handle.

How to convert an image

  1. Drop or pick your JPG file, or paste it with Ctrl/⌘+V.
  2. AVIF is already selected as the target; tune the quality slider if you like (default 60).
  3. Convert, compare the before/after, and save, all on your device.

Why convert to this format?

JPEG is the universal lossy photo format, small and readable everywhere, but with no transparency. AVIF is the newest, most efficient format, the smallest files of all, with transparency and wide-gamut color.

OptImg runs the same high-quality engines desktop tools use, so you get desktop-grade AVIF output at a sensible default (quality 60), adjustable at any time, without ever uploading your image.

Your JPG is decoded, re-encoded to AVIF and handed straight back, ready to save, all in an instant on your device: no server sees a single byte, which is why there's no queue and files can be as large as your device can handle.

Frequently asked questions

Is my JPG uploaded to a server?
The JPG-to-AVIF conversion runs at native speed entirely in your browser: nothing is uploaded, your file never leaves your device, there is no queue, and no size limit beyond your device's memory.
Why is AVIF slower than the other formats?
AVIF trades encode time for the smallest files of any format. Small images finish in a moment; very large photos can take a minute or more. The tool warns you first and you can cancel anytime.
Will converting JPG to AVIF lose quality?
AVIF is lossy, tuned to a visually transparent default (quality 60) that you can raise or lower with the slider. If the conversion can't produce a smaller file than your original, we hand the original back instead.
Is the JPG to AVIF converter free?
Yes: completely free, with no signup, no watermark and no cap on how many files you convert. There is nothing to install; it runs in your browser.