HEIC vs AVIF: Next-Gen Image Format Showdown

HEIC and AVIF represent two competing visions for the future of image compression. Both outperform legacy formats like JPG and PNG by wide margins. Both support HDR, transparency, and advanced color depth. The critical difference lies in their underlying codecs and licensing models -- HEIC relies on the patent-encumbered HEVC, while AVIF builds on the royalty-free AV1.

This guide examines how these two next-generation formats compare on compression, quality, compatibility, and practical use cases.

Codec Foundations

HEIC (High Efficiency Image Container) encodes images using the HEVC/H.265 video codec, standardized in 2013 by the ITU-T and ISO/IEC. HEVC was designed primarily for 4K and 8K video streaming. Apple adopted HEIC as the default iPhone camera format in 2017 with iOS 11, packaging HEVC-compressed still images inside the HEIF container format. For more background on the format, see What is HEIC?.

AVIF (AV1 Image File Format) encodes images using the AV1 video codec, released in 2018 by the Alliance for Open Media (AOMedia). AOMedia's founding members include Google, Mozilla, Microsoft, Apple, Netflix, Amazon, and Intel. AV1 was built from the ground up as a royalty-free successor to VP9 and a competitor to HEVC. AVIF wraps AV1-compressed still frames inside the same HEIF container that HEIC uses.

Both formats are technically HEIF containers. The difference is the compression engine inside: HEVC for HEIC, AV1 for AVIF.

Head-to-Head Comparison

| Feature | HEIC | AVIF | | --- | --- | --- | | Underlying Codec | HEVC / H.265 | AV1 | | Standardized | 2015 (HEIF); codec from 2013 | 2019 (AVIF); codec from 2018 | | Licensing | Patent royalties required | Royalty-free | | Max Color Depth | 16-bit per channel | 12-bit per channel (sufficient for HDR) | | HDR Support | Yes (HLG, HDR10) | Yes (HLG, HDR10, PQ) | | Wide Color Gamut | Display P3, Rec. 2020 | Display P3, Rec. 2020 | | Transparency | Yes (alpha channel) | Yes (alpha channel) | | Animation | Yes (image sequences) | Yes (animated AVIF sequences) | | Lossless Mode | Supported | Supported | | Browser Support | Safari, partial Chromium | Chrome, Firefox, Edge, Safari 16.4+ | | Encoding Speed | Fast | Slow (3-10x slower than HEIC) | | Max Resolution | 8192 x 4320 (Level 6) | 65536 x 65536 (with tiling) |

Compression Efficiency

AVIF achieves slightly better compression than HEIC at low-to-medium bitrates. Multiple independent studies, including those by Netflix and Mozilla, show AV1 delivering 5-15% smaller files than HEVC at equivalent visual quality (measured by SSIM and VMAF). The advantage is most pronounced at lower quality settings where aggressive compression exposes codec differences.

At high bitrates -- where both formats produce near-lossless output -- the gap narrows to negligible levels. For typical web images compressed to quality levels around 60-80, AVIF consistently produces smaller files.

| Scenario | HEIC Size | AVIF Size | AVIF Advantage | | --- | --- | --- | --- | | 12 MP photo, medium quality | ~1.8 MB | ~1.5 MB | ~17% smaller | | 12 MP photo, high quality | ~2.5 MB | ~2.3 MB | ~8% smaller | | 4K HDR image | ~4.0 MB | ~3.4 MB | ~15% smaller | | Graphic with transparency | ~120 KB | ~95 KB | ~21% smaller |

The trade-off is encoding speed. AV1 encoding is computationally expensive -- roughly 3 to 10 times slower than HEVC encoding, depending on the encoder settings and hardware. This makes AVIF impractical for real-time camera capture but well-suited for pre-processed web assets.

Visual Quality

Both formats produce excellent visual quality that surpasses JPG at any given file size. The perceptual differences between HEIC and AVIF at the same file size are subtle and difficult to detect without pixel-level inspection.

Where AVIF has a measurable edge:

• Low-bitrate compression: AVIF preserves fine textures and avoids blocking artifacts more effectively than HEIC when both are pushed to aggressive compression levels.
• Film grain handling: AV1 includes a film grain synthesis tool that can strip grain during encoding and reconstruct it during decoding. This saves bits without losing the visual character of the grain.
• Smooth gradients: AVIF handles banding in gradients slightly better at equivalent file sizes.

Where HEIC holds up well:

• Photographic content at medium-to-high quality: At quality settings above 75, HEIC and AVIF are visually indistinguishable in most photographs.
• High color depth: HEIC supports up to 16-bit per channel versus AVIF's 12-bit. In practice, 12-bit is sufficient for all current display technologies, including HDR.

HDR and Wide Color Gamut

Both formats handle HDR and wide color gamuts natively. This sets them apart from JPG, which has no standardized HDR support, and PNG, which lacks HDR metadata entirely. For a look at how HEIC compares with those older formats, see HEIC vs JPG and HEIC vs PNG.

HEIC supports HDR through HEVC's HLG and HDR10 transfer functions, with 10-bit and 16-bit color depths. AVIF supports PQ (Perceptual Quantizer), HLG, and HDR10 transfer functions with 10-bit and 12-bit color depths. Both support wide gamuts including Display P3 and Rec. 2020.

For HDR photography and display, either format is technically capable. The practical difference is that AVIF's HDR content can be displayed in all major browsers, while HEIC HDR is limited to Safari and Apple's native apps.

Transparency and Alpha Channels

Both HEIC and AVIF support full alpha channel transparency with variable opacity per pixel. Both can encode the alpha channel separately from the color data, allowing different compression settings for each.

In practice, AVIF is the more useful choice for transparent web images because of its broader browser support. HEIC transparency works within Apple's ecosystem but is not usable on the web outside Safari.

Animation Support

HEIC stores animated content as image sequences within the HEIF container. This is how Apple stores Live Photos -- a still frame combined with a short video clip. AVIF supports animated sequences using sequential AV1 frames, similar to how animated WebP works.

Both formats produce animated images that are dramatically smaller than GIF. AVIF has the practical advantage for web-based animation because browsers that support AVIF also support animated AVIF.

Browser and OS Compatibility

AVIF has significantly broader browser support than HEIC. This is the single most important practical difference for web developers and anyone publishing images online.

AVIF browser support:

• Chrome 85+ (August 2020)
• Firefox 93+ (October 2021)
• Edge 85+ (August 2020)
• Opera 71+ (August 2020)
• Safari 16.4+ (March 2023)
• Samsung Internet 16+ (2022)

HEIC browser support:

• Safari on macOS and iOS (native)
• Partial support in Chromium-based browsers (varies by platform and OS codec availability)
• Firefox does not support HEIC

For operating systems, HEIC has native support across Apple's platforms. Windows requires the HEIF Image Extensions from the Microsoft Store. Android added HEIC reading support in Android 10 but results vary. AVIF support in operating systems is growing but still relies on application-level decoding in most cases.

For sharing photos outside the Apple ecosystem, converting HEIC to a universal format remains the most reliable approach. HEICify's HEIC to JPG converter processes files directly in your browser with no server uploads.

Licensing: The Fundamental Divide

This is where HEIC and AVIF diverge most sharply.

HEIC depends on HEVC, which is covered by patents held by multiple patent pools: MPEG LA, Access Advance, and individual patent holders. Any company shipping an HEVC encoder or decoder must negotiate license agreements and pay royalties. These licensing complexities have slowed HEVC adoption outside of Apple and major hardware manufacturers.

AVIF depends on AV1, which AOMedia developed specifically to be royalty-free. All AOMedia members have committed to a perpetual, royalty-free patent license for AV1. This open licensing model is why every major browser vendor added AVIF support -- there is no licensing cost or legal risk.

The royalty-free nature of AV1 is the primary reason AVIF has gained broader industry adoption than HEIC despite being the newer format.

Encoding Speed and Hardware Support

HEIC has a clear advantage in encoding speed. HEVC hardware encoders exist in billions of devices, including every iPhone since the iPhone 7, most modern Android phones, and Intel, AMD, and NVIDIA GPUs. This hardware acceleration makes HEIC encoding fast enough for real-time camera capture.

AV1 hardware encoding support is newer and less widespread. Intel Arc GPUs, NVIDIA RTX 40-series, and AMD RDNA 3 GPUs include AV1 hardware encoders, but most mobile devices still rely on software encoding. Software AV1 encoding is slow -- a single 12 MP image can take 1-5 seconds depending on quality settings and CPU.

For camera manufacturers, HEVC's mature hardware ecosystem makes HEIC the practical choice. For web asset pipelines where images are encoded once and served millions of times, AVIF's slower encoding is an acceptable trade-off for smaller file sizes.

When to Use Each Format

Use HEIC when:

• You are shooting photos on an iPhone or iPad and want efficient on-device storage
• You are working entirely within the Apple ecosystem
• You need fast encoding, such as real-time camera capture
• You want embedded Live Photo sequences or depth map data
• You are syncing photos through iCloud

Use AVIF when:

• You are optimizing images for web delivery and need maximum compression
• You want broad browser compatibility without patent licensing concerns
• You are building a web application that serves images to diverse devices
• You need HDR images that display correctly across all modern browsers
• You are processing images in a server-side pipeline where encoding speed is secondary

Convert HEIC for broader use:

• When web projects require universal format support, convert HEIC to JPG or PNG
• When a website or service rejects HEIC uploads
• When sharing with recipients on Windows or Android who may lack HEIC support

HEICify's HEIC to PNG converter handles lossless conversion when you need to preserve transparency and maximum quality.

The Bottom Line

HEIC and AVIF are both superior to JPG and PNG in compression efficiency, feature set, and color capabilities. Choosing between them depends on your context.

For Apple device photography, HEIC is the practical default. It leverages hardware HEVC encoding for instant capture, integrates deeply with iOS and macOS, and stores advanced metadata like depth maps and Live Photos.

For web delivery and open-ecosystem use, AVIF is the stronger choice. It offers slightly better compression at typical web quality levels, has broader browser support, and carries no patent licensing burden. The royalty-free AV1 foundation ensures AVIF will continue gaining adoption across platforms and tools.

In many workflows, both formats coexist naturally: capture in HEIC on Apple devices, then convert or re-encode to AVIF (or JPG/PNG for maximum compatibility) when publishing to the web. The key is matching the format to the destination rather than committing to a single format for every scenario.