Free webp to jpg
EN
Image MIME Reference
APNG

Animated Portable Network Graphics

image/vnd.mozilla.apng
VS

Comverse Network Systems INF2 Image

image/vnd.cns.inf2
CNS-INF2

A complete technical comparison of Animated Portable Network Graphics and Comverse Network Systems INF2 Image — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

APNG wins on browser support

Feature Support

Feature APNG CNS-INF2
Transparency (Alpha) Yes ✕ No
Animation Support Yes ✕ No
Progressive Loading Yes ✕ No
HDR Support ✕ No ✕ No
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
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
Full APNG reference →
Comverse Network Systems INF2 Image
image/vnd.cns.inf2
Extension
.inf2
Container Proprietary Comverse Container
Compression Proprietary
Algorithm
Unknown (Proprietary Telecom Encoding)
Color Depth Unknown
Developed by Comverse Network Systems (Ann McLaughlin)
Released 1999
Magic Bytes
Unknown (Proprietary)
Full CNS-INF2 reference →

Browser Support Comparison

Browser APNG CNS-INF2
Chrome Chrome
✓ 59
 ✕
Firefox Firefox
✓ 3
 ✕
Safari Safari
✓ 8
 ✕
Edge Edge
✓ 79
 ✕
IE 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)
CNS-INF2

CNS-INF2 Strengths

  • Historically allowed Comverse to standardize media transmission internally across their global telecom messaging platforms
Limitations
  • Completely obsolete and non-functional outside of decommissioned telecom infrastructure
  • Undocumented, closed-source binary structure
  • Zero support in modern image processing libraries like ImageMagick, libvips, or FFmpeg

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
CNS-INF2
Use CNS-INF2 when…
  • Legacy Telecom Infrastructure
  • Historical Comverse Unified Messaging Systems
  • Proprietary Server-to-Server Media Exchange

More comparisons

APNG vs ACES → CNS-INF2 vs ACES → APNG vs AVCI → CNS-INF2 vs AVCI → APNG vs AVCS → CNS-INF2 vs AVCS → APNG vs AVIF → CNS-INF2 vs AVIF → All comparisons →
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