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Image MIME Reference
AVCI

AVC Image (HEIF Container)

image/avci
VS

Graphics Interchange Format

image/gif
GIF

A complete technical comparison of AVC Image (HEIF Container) and Graphics Interchange Format — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

GIF wins on browser support

Feature Support

Feature AVCI GIF
Transparency (Alpha) Yes Yes
Animation Support ✕ No Yes
Progressive Loading ✕ No Yes
HDR Support Yes ✕ No
EXIF Metadata Yes ✕ No
ICC Color Profile Yes Yes
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
Full AVCI reference →
Graphics Interchange Format
image/gif
Extension
.gif
Container GIF
Compression Lossless (LZW)
Algorithm
LZW (Lempel-Ziv-Welch)
Color Depth 1-bit, 4-bit, 8-bit (Indexed)
Developed by CompuServe
Released 1987
Magic Bytes
47 49 46 38 39 61
Full GIF reference →

Browser Support Comparison

Browser AVCI GIF
Chrome Chrome
✕
✓ All
Firefox Firefox
✕
✓ All
Safari Safari
✕
✓ All
Edge Edge
✕
✓ All
IE IE (Legacy)
✕
✓
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.
GIF

GIF Strengths

  • Universal support across all web browsers, operating systems, and messaging apps
  • Supports basic frame-by-frame animation out of the box
  • Lossless compression is highly effective for simple, flat-color graphics like logos or pixel art
Limitations
  • Limited to 256 colors per frame, resulting in poor quality for complex gradients and photographs
  • Animations produce massive file sizes compared to modern formats like MP4, WebP, or AVIF
  • 1-bit transparency limits edge blending on non-uniform backgrounds

When to choose which format

AVCI
Use AVCI when…
  • Digital Photography
  • Camera Capture
  • Archival Storage
GIF
Use GIF when…
  • Web Animations
  • Memes
  • Simple Graphics
  • Logos with flat colors

More comparisons

AVCI vs ACES → GIF vs ACES → AVCI vs APNG → GIF vs APNG → AVCI vs AVCS → GIF vs AVCS → AVCI vs AVIF → GIF vs AVIF → All comparisons →
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