JPG to AVIF Converter

For photos, AVIF usually needs about 40% fewer bytes than a JPG that stays as close to the original, and about 20% fewer than WebP. Measured with this converter on 22 detailed photos saved as high-quality JPGs (3.0 MB in total):

At 70%, the AVIF files were as close to the originals, on average, as JPGs saved at 75%, at 58% of their size. Smooth pictures do even better: a 1600 × 1200 landscape with a clear sky went from 193 KB as JPG to 12 KB as AVIF at 85%.

AVIF squeezes photos so well because the encoder tries many ways of compressing each part of the image, and that takes time. It runs in the background, so the page stays usable, but expect to wait. On a recent, fast laptop in Chrome:

Phones and older computers take longer, and photos are converted one at a time, so a folder of 100 phone photos can take several minutes. Photos with less fine detail encode faster. Resizing big photos to the size they’re shown at first saves time as well as bytes.

Browsers can display AVIF but have no built-in way to create it, so this page brings its own encoder: libavif, the open-source AVIF library, running on your device. It’s about 1 MB, downloaded from this site the first time you add images here, and then kept by your browser, so later visits and offline use don’t fetch it again.

Your photos are encoded on your phone or computer and never uploaded. If the download fails, for example on a patchy connection, you’ll see an error; press Process again to retry.

• 85% (the default): for photos you care about. Still about a fifth smaller than WebP at 85%.
• 70–80%: the best balance for most websites, from the table above.
• 60% and below: only for thumbnails and backgrounds. AVIF smooths fine texture first: at 60%, the fine lines in an owl’s eyes in one test photo had visibly smoothed away.
• 90–100%: not lossless, and the files grow fast. The 22 test photos were 1.1 MB at 90% and 1.9 MB at 100%.

To check a setting before converting a whole folder, open one original and its AVIF in Compare Two Images.

All current browsers display AVIF: Chrome since 2020, Firefox since 2021, Safari since iOS 16 and macOS Ventura in 2022, and Edge since January 2024. Apps have been slower: Windows 11 and macOS have only opened AVIF out of the box since 2022, and WordPress accepts AVIF uploads from version 6.5 if the server supports it (check Tools → Site Health → Info → Media Handling). For email, printing and upload forms, send JPGs.

To cover older browsers, list AVIF first in a picture element, then WebP, with the JPG in the img. Each browser loads the first format it supports:

<picture>
  <source srcset="photo.avif" type="image/avif">
  <source srcset="photo.webp" type="image/webp">
  <img src="photo.jpg" alt="Describe the photo" width="1200" height="800">
</picture>

Make the WebP copies with the JPG to WebP converter. If someone sends you an AVIF that won’t open, AVIF to JPG turns it back.