Notice: ICO (Microsoft Icon Format) supports alpha channel transparency, but HEIF / HEIC (High Efficiency Image Format) is a non-transparent format. Any transparent backgrounds in your input file will be filled with a solid background during conversion (typically white).
ICO vs HEIF Technical Comparison
| Technical Feature | ICO (Source) | HEIF (Target) |
|---|
| Compression Type | Uncompressed / PNG container | Lossy HEVC |
| Alpha Transparency | Supported (8-bit Alpha) | Not Supported (Opaque) |
| Animation Support | Static Image | Static Image |
| Browser Compatibility | Universal for web browser favicons | Apple Ecosystem Native (Safari / iOS / macOS native; requires conversion for general web playback) |
| Editing Compatibility | Specialized icon editor support | Moderate (Native on iOS/macOS, requires extensions on Windows) |
| Primary Use Case | Website favicons, Windows desktop shortcuts, application icons | iPhone camera photos, iPad image captures, high-efficiency mobile storage |