Ani-ST vs APNG Format Comparison
Ani-ST
Ani ST Animation Script
image/x-ani-st
VS
Animated Portable Network Graphics
image/apng
APNG
A complete technical comparison of Ani ST Animation Script and Animated Portable Network Graphics — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
APNG wins on browser support
Feature Support
| Feature | Ani-ST | APNG |
|---|---|---|
| Transparency (Alpha) | ✕ No | Yes |
| Animation Support | Yes | Yes |
| Progressive Loading | ✕ No | ✕ No |
| HDR Support | ✕ No | ✕ No |
| EXIF Metadata | ✕ No | Yes |
| ICC Color Profile | ✕ No | Yes |
Ani ST Animation Script
image/x-ani-st
Extension
.scr.str
Container
Text-based Scripting Language
Compression
Uncompressed (Plain Text Script)
Algorithm
None
Color Depth
Atari ST Indexed Palette (up to 16 colors)
Developed by
Jim Kent (Published by Antic Software)
Released
1987
Magic Bytes
Animated Portable Network Graphics
image/apng
Extension
.apng.png
Container
PNG
Compression
Lossless
Algorithm
DEFLATE
Color Depth
8-bit, 24-bit, 32-bit
Developed by
Mozilla Corporation
Released
2004
Magic Bytes
89 50 4E 47 0D 0A 1A 0A
Browser Support Comparison
| Browser | Ani-ST | APNG |
|---|---|---|
Chrome
|
✕ |
✓ 59+
|
Firefox
|
✕ |
✓ 3+
|
Safari
|
✕ |
✓ 8+
|
Edge
|
✕ |
✓ 79+
|
IE (Legacy)
|
✕ | ✕ |
Ani-ST
Ani-ST Strengths
- Produced incredibly small file sizes by storing rendering instructions (vectors) rather than raw raster frames, making it ideal for floppy disks
- The human-readable script format allowed advanced users to manually edit animation paths and parameters directly in a text editor
Limitations
- Completely obsolete and inherently tied to the hardware limitations of the Atari ST ecosystem
- The generic .scr and .str extensions conflict with dozens of other historical and modern formats, making file identification a major challenge
- Zero native support in modern operating systems, web browsers, or standard graphics software
APNG
APNG Strengths
- Drastically better quality than GIF (supports millions of colors and full alpha transparency)
- Backward compatibility: Standard PNG decoders will gracefully fall back to displaying the first frame of the APNG
- Lossless compression guarantees no ugly artifacting around edges
Limitations
- File sizes can become very large for complex, long animations or high frame rates
- Often confused with standard PNGs since they share the same '.png' extension
- Lack of lossy compression options compared to Animated WebP or AVIF
When to choose which format
Ani-ST
Use Ani-ST when…
- Atari ST Retrocomputing Archival
- Vector Animation Scripts
- 1980s Computer Graphics History
APNG
Use APNG when…
- Web Animations
- Animated Stickers
- UI Loading Spinners
- High-Quality Memes
Convert & Edit Online
Free online web tools for Ani-ST and APNG files.
Free Image Resizer
Editor
Resize, scale, crop, and modify dimensions for any photo or graphic.
Use Tool
Image Metadata Remover
Privacy
Clean EXIF, camera, lens, and location tags from your photos.
Use Tool
WebP to JPG Converter
Universal
Convert modern web images to universal high-compatibility JPG.
Use Tool
Compress WebP Images
Optimizer
Reduce image file sizes for faster web performance.
Use Tool