Free webp to jpg
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Image MIME Reference
GIF

Graphics Interchange Format

image/gif
VS

PTI Image (Personal/Vanity Tree)

image/prs.pti
PTI

A complete technical comparison of Graphics Interchange Format and PTI Image (Personal/Vanity Tree) — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

GIF wins on browser support

Feature Support

Feature GIF PTI
Transparency (Alpha) Yes ✕ No
Animation Support Yes ✕ No
Progressive Loading Yes ✕ No
HDR Support ✕ No ✕ No
EXIF Metadata ✕ No ✕ No
ICC Color Profile Yes ✕ No
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 →
PTI Image (Personal/Vanity Tree)
image/prs.pti
Extension
.pti
Container Proprietary
Compression Unknown / Proprietary
Algorithm
Unknown
Color Depth Unknown
Developed by Jürn Laun
Released 1999
Magic Bytes
Unknown
Full PTI reference →

Browser Support Comparison

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

PTI Strengths

  • Provided a registered MIME type namespace for a specific application's proprietary image format without conflicting with standard web types
Limitations
  • Completely undocumented and unsupported in modern ecosystems
  • Zero web browser compatibility
  • Falls into the 'vanity' tree, making it irrelevant for standard cross-platform data exchange

When to choose which format

GIF
Use GIF when…
  • Web Animations
  • Memes
  • Simple Graphics
  • Logos with flat colors
PTI
Use PTI when…
  • Legacy Application Specific Workflows
  • Proprietary Image Storage

More comparisons

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