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BPG at a glance
BPG
BPG arrived in the mid-2010s when image engineers were looking for better post-JPEG compression before AVIF and JPEG XL had ecosystem momentum.
ICNS at a glance
ICNS
ICNS reflects the Mac graphics-resource tradition where a single icon asset is really a packaged set of representations for one application or object identity.
Format comparison
| Feature | BPG | ICNS |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2014 | 2000 |
| Inventor | Fabrice Bellard | Apple |
| Status | active | proprietary |
| Transparency | Not supported | Not supported |
| Animation | Supported | Not supported |
| Primary use cases |
|
|
| Layer support | Not supported | Not supported |
| Vector scaling | Not supported | Not supported |
| Camera raw data | Not supported | Not supported |
| HDR support | Supported | Not supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use BPG
- Your source file is already in BPG.
- Preserve source expectations before exporting to ICNS.
- BPG is commonly used in image workflows.
When to use ICNS
- Your target workflow expects ICNS.
- Improve delivery compatibility with ICNS.
- ICNS is commonly used in image workflows.
FAQs
Why convert BPG to ICNS?
Convert to ICNS when creating or updating macOS application icons or preserving Apple-specific icon assets.
It is the correct target when a Mac application bundle or desktop asset workflow expects native icon resources.
What changes when converting BPG to ICNS?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to ICNS removes animation support. Moving to ICNS removes HDR content.
What should I review after converting BPG to ICNS?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.