Convert BMP to ICNS on Mac
Convert BMP files to ICNS format on your Mac with Jollycat. Uncompressed raster image format. Simple and lossless but produces very large files. Legacy Windows format. All processing runs locally on your Mac — no cloud processing and no uploads required for conversion.
BMP vs ICNS
| Property | BMP | ICNS |
|---|---|---|
| Type | lossless | lossless |
| Compression | Uncompressed or RLE | PNG or JPEG 2000 embedded |
| Transparency | No | Yes |
| Animation | No | No |
| Bit Depth | 1/4/8/24/32-bit | 8/32-bit |
| File Extension | .bmp | .icns |
| Key Advantage | No compression artifacts | macOS standard icon format |
How to Convert BMP to ICNS on Mac
Open your BMP file
Drag and drop your .bmp file onto the Jollycat icon in your macOS dock or menu bar. Jollycat instantly detects the format.
Select ICNS format
Pick ICNS from the list of output formats. Optionally adjust quality, resolution, or compression settings.
Convert and save
Click Convert and Jollycat processes the file instantly on your Mac. No uploads required, no waiting — everything runs locally on Apple Silicon.
When to Convert BMP to ICNS
ICNS advantages
macOS standard icon format. Retina display support.
BMP limitations
Extremely large files. No transparency in common usage.
Common use cases
macOS app icons, Dock icons, macOS development.
BMP to ICNS Conversion Tips
ICNS supports transparency. If your source image has a solid background, you can remove it with an image editor before converting.
ICNS bundles multiple image sizes from 16x16 to 1024x1024 for standard and Retina displays.
Frequently Asked Questions
Is the BMP to ICNS conversion free?
Jollycat is a one-time purchase for $9.99. Once purchased, you can convert BMP to ICNS and use all 1,650+ conversion paths with no limits.
Does converting BMP to ICNS require an internet connection?
No. Jollycat processes everything locally on your Mac. Your BMP files never leave your device — all conversion happens offline using Apple Silicon.
Can I batch convert multiple BMP files to ICNS?
Yes. Drag multiple BMP files onto Jollycat and convert them all to ICNS at once. Batch processing is built in.
Ready to Convert BMP to ICNS?
Jollycat handles BMP to ICNS conversion and 1,650+ other format conversions. All offline on your Mac.
Get Jollycat for Mac