AVIF vs HEIC: Browser Compatibility and Licensing

AVIF and HEIC are both modern image formats designed to deliver superior compression and image quality compared to legacy standards like JPEG. However, their practical application diverges sharply when evaluated for the web. This comparison examines AVIF and HEIC through the critical lenses of browser compatibility and licensing friction, detailing why AVIF has emerged as the preferred open standard for web delivery while HEIC remains largely confined to specific operating system ecosystems.

Licensing Friction

The most significant operational difference between AVIF and HEIC lies in their intellectual property and licensing models:

• HEIC (High Efficiency Image Container): HEIC relies on the HEVC (H.265) compression standard. HEVC is governed by an intricate, fragmented web of multiple patent pools—including MPEG LA, Access Advance, and Velos Media—as well as independent patent holders. Implementing HEIC requires commercial distributors and software vendors to navigate complex royalty structures, negotiate multiple licenses, and potentially pay substantial recurring fees. This patent thicket creates immense legal and financial risk for open-source projects and software distributors.
• AVIF (AV1 Image File Format): AVIF is built on the AV1 video codec developed by the Alliance for Open Media (AOMedia), a consortium that includes Google, Apple, Microsoft, Mozilla, Amazon, and Netflix. AVIF is an open, royalty-free format. Its specification includes an explicit patent license grant, eliminating the risk of unexpected royalty claims and enabling developers to integrate AVIF decoding and encoding into open-source software and commercial products without legal friction.

Browser Compatibility

Licensing terms directly dictate how web browsers have adopted each format:

• HEIC Browser Support: HEIC has virtually nonexistent native support across the broader web. Because integrating HEIC decoders exposes browser vendors to HEVC patent royalties, Google Chrome, Mozilla Firefox, and Microsoft Edge do not natively decode HEIC images on the web. Only Apple's Safari natively renders HEIC images, and typically only when running on Apple hardware with built-in HEVC hardware support. Consequently, HEIC cannot be reliably served to general web traffic without converting it to another format on the server or using resource-heavy client-side JavaScript decoders.
• AVIF Browser Support: Because AVIF is royalty-free, browser vendors have adopted it rapidly. Native AVIF support is standard across all major modern desktop and mobile browsers, including Google Chrome, Mozilla Firefox, Microsoft Edge, Opera, and Apple Safari (since iOS 16 and macOS Ventura). Web developers can confidently use AVIF in production using standard HTML elements like <picture> to serve lightweight images to the overwhelming majority of global web users.

Conclusion

While both formats offer remarkable compression capabilities, AVIF is the definitive winner for web use. HEIC functions effectively as a capture and storage format within consumer hardware—most notably on Apple devices—but its restrictive licensing prevents it from becoming a universal web standard. In contrast, AVIF’s open-source, royalty-free governance has enabled near-universal browser adoption, making it the industry standard for next-generation web image delivery.