AVIF is an image format based on the AV1 video codec. It supports lossy and lossless compression, transparency, and high dynamic range, and at the same visual quality it can produce smaller files than JPG and often than WebP. Current versions of the major browsers can display AVIF, but many desktop apps, older phones and upload forms cannot open it yet.
About AVIF
Browser support for saving AVIF
This converter relies on the browser's built-in image encoder. Displaying AVIF and saving AVIF are different features, and many browsers that show AVIF images cannot write them from a canvas. When a browser is asked for a format it cannot write, it quietly produces PNG instead.
The tool checks the result. If what came back is not AVIF, the file is marked "This browser cannot save AVIF files" and nothing mislabelled is offered for download. If you see that message, convert to WebP instead, which every current major browser can encode, or use desktop software with an AVIF encoder.
Before switching a website to AVIF
- Serve AVIF with a fallback (WebP or JPG) using the
<picture>element, so visitors with older software still see the image. - Check that your content system and CDN accept and pass through AVIF files.
- Compare sizes on your own images. Gains vary a lot between photos.
Settings and output
- Quality: AVIF is written at quality 0.9 where the format uses a quality setting. There is no slider on converter pages; use the Image Compressor if you want to choose the quality yourself.
- Size limits: images longer than 4096 px on either side are scaled down to 4096 px. If a converted file would be over 10 MB, it is reduced in steps until it fits.
- Batches: add several files; three are converted at a time. One file downloads directly, two or more come as a ZIP.
- Metadata: EXIF data (camera, date, GPS) and colour profiles are not carried into the new file.
Where the processing happens
Encoding happens in your browser; images are not uploaded to any server.
Questions about this tool
Why do all my files show an error?
Your browser cannot encode AVIF from a canvas. The tool refuses to save a PNG with an .avif name. Use WebP, or try a different browser.
How do I know if my browser can save AVIF?
Add one JPG and press Convert Images. If the file shows "This browser cannot save AVIF files", your browser can only display AVIF, not create it. In that case convert to WebP instead.
Is AVIF smaller than WebP?
Often, but not always. It depends on the picture. Compare the sizes shown under each converted file before switching a whole website.
Will everyone be able to open my AVIF files?
Current browsers can show AVIF, but many desktop apps, older phones and upload forms cannot. For sharing with other people, JPG or WebP is safer.
Can I convert many files at once?
Yes. Add several files and press Convert Images once. Three are converted at the same time. Download All gives you one ZIP file, or you can download each file on its own.