What is an AVIF file?
Learn how the open AVIF image format cuts file sizes up to 50 percent compared to JPG while retaining transparency, HDR color, and rich animation fidelity. Free AVIF converters included.
AVIF stands for AV1 Image File Format, introduced in 2019 by the Alliance for Open Media. It was created to address the growing demand for smaller, higher-quality web imagery without the restrictive licensing fees tied to older standards. By packaging individual video frames from the royalty-free AV1 video codec into the standardized HEIF container structure, AVIF delivers dramatic bandwidth savings for modern websites. It gives you a way to serve crisp photographs and intricate illustrations at roughly half the file size of traditional JPG files while maintaining visual clarity across supported platforms.
Under the hood, AVIF utilizes the AV1 compression engine to support both lossy and lossless encoding. It goes beyond the limitations of legacy formats by supporting 8-bit, 10-bit, and 12-bit color depths along with High Dynamic Range, wide color gamuts, and full alpha channel transparency. Because the underlying architecture treats still images as keyframes within an ISOBMFF container, the format natively accommodates multi-layer sequences and animated image bursts. This means you can replace bulky animated GIF files with lightweight sequences that consume a fraction of the bandwidth while preserving smooth gradients.
You encounter AVIF across the modern web, where content delivery networks and progressive websites serve it dynamically to compatible browsers. Native support arrived in Chrome 85, Firefox 93, and Safari 16.4, making it accessible on the majority of modern smartphones and desktop operating systems. However, older operating systems, native image viewers, and legacy software pipelines cannot decode the format without specialized plugins. When you prepare graphics for wide distribution, you must balance its superior compression against the necessity of providing fallback formats for users on older hardware.
Technical specification
| Extension | .avif |
|---|---|
| MIME type | image/avif |
| Compression | Lossy and lossless (AV1 core) |
| Transparency | Yes |
| Animation | Yes |
| Typical file size | Roughly half of JPG and about 20% smaller than WebP at equal quality |
| Browser and system support | Chrome 85+, Firefox 93+, Safari 16.4+; older devices cannot decode it |
| Developed by / year | Alliance for Open Media, 2019 |
When to use it
- Choose this format when you need to serve high-resolution web photographs at roughly half the file size of standard JPG files without visible compression artifacts.
- Choose this format when you want to replace animated GIF assets with modern animated image sequences that use up to eighty percent less data.
- Choose this format when your user interface requires transparent background graphics that render smaller than equivalent PNG or WebP files.
- Choose this format when publishing photographic portfolios that take advantage of ten-bit or twelve-bit High Dynamic Range color gamuts.
When not to use it
- Avoid this format when creating universal email marketing campaigns, and use JPG or PNG instead to ensure reliable rendering across legacy email clients.
- Avoid this format when preparing print-ready files or working in traditional desktop publishing workflows, and choose TIFF or PNG instead.
- Avoid this format when distributing assets to users on older operating systems or browsers released before 2020, and provide WebP or JPG fallbacks instead.
Our tools for this format
9 tools that take AVIF files in or write them out. Each one runs in your browser, so nothing is uploaded.
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Common problems
Your exported AVIF image appears completely blank or fails to open on an older computer.
Older operating systems lack native codecs required to decode AV1 image frames. You can resolve this by converting the file to a widely supported format like JPG or PNG directly in your web browser. Alternatively, install an AV1 extension pack if your operating system supports add-on codec packages.
Image editing software displays an unsupported format error when importing an AVIF file.
Many legacy graphics editors and desktop applications do not yet include built-in decoders for the AVIF container. Convert the image into a standard lossless PNG or high-quality JPG before importing it into your editor. You can also look for third-party file format plugins designed for your specific image editing program.
Animated AVIF files fail to loop or play back in certain web browsers.
Older browser versions often lack support for animated AVIF sequence containers even if they can render static AVIF frames. Convert the animated asset into an animated WebP file or a short muted MP4 video to guarantee broader animation compatibility. Always test your animations across Safari, Chrome, and Firefox to confirm consistent playback.
Colors in your AVIF photo look washed out or shift unexpectedly after saving.
This issue typically occurs when an image with a wide color gamut or High Dynamic Range profile is converted without proper sRGB color space mapping. Re-encode the image while converting the color profile explicitly to standard sRGB for web delivery. This ensures accurate color reproduction across monitors with varying color capabilities.
Frequently asked questions
How much smaller is AVIF compared to JPG and WebP?
AVIF reduces image file sizes by roughly 50% compared to JPG and about 20% compared to WebP at equivalent visual quality. This significant compression efficiency helps web pages load substantially faster while consuming less bandwidth.
Which web browsers support AVIF files?
AVIF is supported by Chrome 85 and newer, Firefox 93 and newer, and Safari starting with version 16.4. Browsers released before 2020 generally cannot decode AVIF files without polyfills or server-side fallbacks.
Can AVIF files handle transparency and animation?
Yes, AVIF fully supports alpha channel transparency for clean cutouts as well as multi-frame animations. Animated AVIF files can replace legacy animated GIF files while reducing file sizes by up to 80%.
Is AVIF a proprietary or royalty-free format?
AVIF is an open, royalty-free image format developed by the Alliance for Open Media in 2019. It uses the open-source AV1 video compression standard, preventing licensing and patent fee complications.
Can I convert an AVIF file back to JPG or PNG without quality loss?
Converting an AVIF to PNG is completely lossless and retains every detail present in the AVIF file. Converting to JPG introduces standard lossy recompression, though choosing a quality setting of 90% or higher will keep degradation imperceptible.