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KazamTools

AVIF to JPG Converter

Turn next-generation AVIF images into JPGs that open everywhere.

Files are processed in your browser and never uploaded.How it works

or drop AVIF images here. Batch conversion, no limits.

90

90 is a good default: it looks like the original at a fraction of the size.

Background for transparent areas

JPG cannot store transparency, so see-through areas are filled with this colour.

How to use the AVIF to JPG

  1. 1Click Choose images or drop AVIF files onto the box.
  2. 2Keep quality 90 or lower it for smaller files.
  3. 3Choose a background colour if your AVIF images have transparency.
  4. 4Download each JPG or all of them as one ZIP.

What is AVIF?

AVIF stands for AV1 Image File Format. It was released in 2019 by the Alliance for Open Media, a group that includes Google, Apple, Microsoft, Mozilla, Netflix and Amazon. It stores a single frame compressed with the AV1 video codec inside a HEIF container (the same container family as iPhone HEIC photos), but AV1 is royalty-free, so anyone can support it.

AVIF is impressively efficient. It handles smooth gradients and fine detail well at low file sizes, supports transparency, and can store HDR images with 10 or 12 bits per colour. That is why image CDNs and large sites increasingly serve AVIF to browsers that accept it.

Who supports AVIF

Software AVIF support
Chrome and Edge Yes (Chrome since version 85, 2020)
Firefox Yes, since version 93 (2021)
Safari Yes, since Safari 16 (2022)
Windows Photos With the AV1 Video Extension installed
Older phones, many editors, office apps and upload forms Often no

So an image saved from a website as .avif may display fine in your browser yet refuse to open anywhere else. Converting to JPG solves that.

How much bigger will the JPG be?

AVIF’s efficiency works against you here. We saved two 1920 × 1200 landscape photos both ways, as AVIF at a typical web setting and as JPG at quality 90:

Photo AVIF JPG (quality 90) Growth
Hills and sky 35 KB 301 KB 8.6×
Forest lake 51 KB 314 KB 6.2×

The JPG is not better quality than the AVIF; both formats are lossy, and converting cannot restore detail the AVIF discarded. The JPG simply needs more bytes to describe the same picture. If size matters, lower the quality to 80, or use Compress to KB to hit an exact limit.

How the converter decodes AVIF

The tool first asks your browser to decode the image, which handles colour profiles, HDR tone mapping and rotation. On older browsers without AVIF support it falls back to libavif, the reference decoder, compiled to WebAssembly. Either way everything happens on your device; nothing is uploaded.

The decoded image is then saved with MozJPEG. Because JPG has no transparency, see-through areas are filled with the background colour you choose (white by default). Images with HDR or wide colour are converted to standard 8-bit colour, which looks right on ordinary screens; the brightest HDR highlights may look a little flatter than in an HDR viewer.

Converting on your own computer

  • Windows 11: install the free AV1 Video Extension from the Microsoft Store, open the file in Photos or Paint and use Save as to choose JPEG.
  • Mac: on macOS Ventura and later, Preview opens AVIF; use File → Export and pick JPEG.
  • Any device: this page, for one image or a whole folder at once, with the original file names kept (hero-image.avif becomes hero-image.jpg).

Tips

  • Keep the AVIF if you might use the image on a website again: it is the smaller, more modern file.
  • Got WebP images too? Use WebP to JPG. iPhone photos in HEIC format convert with HEIC to JPG.
  • To shrink the converted JPGs, try Compress Image, or combine them into one document with JPG to PDF.

Common conversions

Frequently asked questions

What is an AVIF file?

AVIF (AV1 Image File Format) is a modern image format from the Alliance for Open Media, released in 2019. It uses the AV1 video codec and makes files much smaller than JPG, so many websites now serve images as AVIF.

Why can’t I open AVIF files?

Current browsers show AVIF, but many photo viewers, editors, office programs and upload forms do not. Converting to JPG makes the image usable everywhere.

Why is the JPG so much bigger than the AVIF?

AVIF is very efficient. In our test the same photo was 35 KB as AVIF and 301 KB as a JPG at quality 90. Quality 80 gives a noticeably smaller file that still looks good.

Does it work with HDR or 10-bit AVIF images?

Yes. They are converted to standard 8-bit JPG, which every screen can show. Very bright HDR highlights may look flatter than in an HDR-capable viewer.

Are my images uploaded?

No. Decoding and conversion happen in your browser, on your device.

Guides

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