Image MIME Reference
APNG
Animated Portable Network Graphics
image/vnd.mozilla.apng
VS
AVC Image (HEIF Container)
image/avci
AVCI
A complete technical comparison of Animated Portable Network Graphics and AVC Image (HEIF Container) — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
APNG wins on browser support
Feature Support
| Feature | APNG | AVCI |
|---|---|---|
| Transparency (Alpha) | Yes | Yes |
| Animation Support | Yes | ✕ No |
| Progressive Loading | Yes | ✕ No |
| HDR Support | ✕ No | Yes |
| EXIF Metadata | Yes | Yes |
| ICC Color Profile | Yes | Yes |
Animated Portable Network Graphics
image/vnd.mozilla.apng
Extension
.apng.png
Container
PNG Chunk Stream
Compression
Deflate (Lossless)
Algorithm
Deflate (zlib)
Color Depth
8-bit (Indexed), 24-bit (TrueColor), 32-bit (RGBA)
Developed by
Mozilla Corporation (Stuart Parmenter & Vladimir Vukićević)
Released
2004
Magic Bytes
89 50 4E 47 0D 0A 1A 0A
AVC Image (HEIF Container)
image/avci
Extension
.avci.hif
Container
HEIF / ISOBMFF (ISO/IEC 14496-12)
Compression
Lossy / Lossless
Algorithm
AVC (Advanced Video Coding / H.264)
Color Depth
8-bit, 10-bit, 12-bit
Developed by
Moving Picture Experts Group (MPEG) / ISO/IEC JTC 1
Released
2015
Magic Bytes
XX XX XX XX 66 74 79 70 61 76 63 69
Browser Support Comparison
| Browser | APNG | AVCI |
|---|---|---|
Chrome
|
✓ 59
|
✕ |
Firefox
|
✓ 3
|
✕ |
Safari
|
✓ 8
|
✕ |
Edge
|
✓ 79
|
✕ |
IE (Legacy)
|
✕ | ✕ |
APNG
APNG Strengths
- Supports 8-bit alpha transparency, completely solving the ugly 'white halo' problem inherent to GIFs
- Gracefully degrades; viewers that do not support APNG will render a perfectly valid, static PNG of the first frame
- Provides lossless compression that retains absolute pixel-perfect quality for UI elements and line art
Limitations
- Because it relies on lossless Deflate compression, file sizes for complex, video-like animations can be massive compared to lossy formats like WebP or AVIF
- Was initially rejected by the official PNG group, delaying its adoption for nearly a decade
- Lacks native hardware decoding acceleration, unlike video-based animated formats (like MP4 or WebM)
AVCI
AVCI Strengths
- Shares the robust, flexible HEIF container architecture that allows for rich metadata, HDR, and depth maps.
- Backed by the highly ubiquitous AVC (H.264) codec, which is widely supported in hardware decoding.
- Supports rectangular cropping and rotation metadata without needing to re-encode the pixel data.
Limitations
- No native support within web browsers for HTML rendering.
- Inferior compression efficiency when compared to newer container formats like HEIC (HEVC) or AVIF (AV1).
- Easily confused with HEIC and AVIF, which use the same base ISOBMFF container.
When to choose which format
APNG
Use APNG when…
- High-Quality Web Animations
- Stickers (Apple iMessage, LINE, Discord)
- UI Loaders with Alpha Transparency
- GIF Replacement
AVCI
Use AVCI when…
- Digital Photography
- Camera Capture
- Archival Storage