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You can serve AVIF to compatible browsers and keep JPG available for clients and tools that need it. Convert source images with AVIF encoders, retain the original JPG, and measure the output on your own images: AVIF can save substantial space, but no published figure guarantees the same result for every asset.
What AVIF changes—and what it does not
AVIF (AV1 Image File Format) stores AV1 bitstreams in the HEIF container. It supports still images and sequences, transparency, high dynamic range (HDR), wide color gamut (WCG), auxiliary data such as depth maps, and layered images for progressive decoding. The Alliance for Open Media’s AVIF specification says the format supports HDR and WCG as well as standard dynamic range (SDR).
Those format capabilities are not a promise that every encoder, browser, or downstream tool handles every feature consistently. Check the specific profiles and features your workflow uses. For ordinary web photos, the practical question is whether the AVIF looks acceptable at a smaller file size on your target clients—not whether the format can support more advanced image features.
How to convert between JPG and AVIF
Convert JPG to AVIF
The official libavif utility avifenc accepts JPEG and PNG inputs, among other documented input types. A basic conversion is:
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avifenc input.jpg output.avifExact options and codec support depend on how libavif was built. Choose encoder settings for your quality and performance needs, and inspect the result rather than assuming a particular setting will suit every image.
Convert AVIF to JPG
The companion utility avifdec can write JPEG or PNG output:
avifdec input.avif output.jpgThe avifdec manual documents JPEG output as always 8 bits per channel. Because this path decodes AVIF and encodes a new JPEG, it does not recover the bytes of an earlier JPG. Keep the original file if you need the exact source or its original metadata.
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See the avifenc manual for input details and options. These command-line tools are useful for batch or build workflows; verify the installed libavif version’s documentation before relying on version-specific flags.
How to serve AVIF while keeping JPG compatibility
MDN lists AVIF’s MIME type as image/avif and its extension as .avif. It lists support for still AVIF images in Chrome 85, Edge 121, Opera 71, Firefox 93, and Safari 16.1. Firefox support for animated AVIF begins with version 113. These are the versions listed in MDN’s image format guide; check its compatibility information for current details.
For a website, provide AVIF where it fits your audience and retain a suitable JPG alternative for clients or parts of your pipeline that need it. Test the actual browsers and features you rely on. A browser’s support for still AVIF does not by itself establish support for animation, every color profile, or every other AVIF feature.
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Include both formats in the delivery and cache plan. Generating and storing multiple versions adds operational work, so weigh the likely byte savings against the cost of encoding, storage, and maintaining fallbacks. The cited compatibility information establishes browser support by version, not the behavior of every CDN, image pipeline, or downstream application.
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How much smaller can AVIF make an image?
The Alliance for Open Media says AVIF can provide over 50% file-size savings compared with JPEG and over 30% compared with WebP; the cited overview does not state a publication year. These are stated potentials, not guarantees for a specific image, encoder, or matched-quality workflow.
A Google Developers codelab published in 2026 shows one sample image shrinking from 3340 kB to 378 kB after conversion—nearly ten times smaller in that demonstration. It is an example, not a general benchmark. Image content, encoder configuration, and the quality target all affect the result.
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How to decide whether AVIF is worth using
Compare AVIF and JPG at the quality level your product actually needs. A smaller file is useful only if the image remains acceptable and the clients and tools that matter can handle it.
- Compare file size at an acceptable visual quality, and visual quality at a file-size target.
- Inspect the actual assets: photographs, graphics, transparent images, animation, and color-critical images can behave differently.
- Measure encoding time, decoding time, and compute cost in your deployment environment.
- Check support for the features you use, including still images, animation, alpha transparency, HDR, and color profiles.
- Account for fallback generation, storage, cache behavior, and the effort of maintaining multiple formats.
The cited sources do not establish a controlled, apples-to-apples benchmark across encoders and image classes. Test representative assets and target clients before deciding how broadly to adopt AVIF; the available savings claims alone do not establish one universally best format.
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