BMP to ICO Converter
Drop your BMP images here
Convert BMP to ICO — free, instant, no upload
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Standard favicon: 32×32. For high-DPI displays use 64×64 or larger. Windows icons use 256×256.
How to Convert BMP to ICO
Click Browse Files or drag & drop your BMP images onto the converter above. You can select multiple files for batch conversion.
Set the compression quality using the slider — higher values preserve more detail, lower values produce smaller files. Optionally enable resizing to change the output dimensions.
Click Convert to ICO and your files will be processed instantly in your browser. Download them individually or all at once.
🔒 All image conversions happen 100% in your browser. Your files are never uploaded to any server — completely private, free, and unlimited.
Why Convert BMP to ICO?
ICO supports transparency, allowing you to place images over any background without a white or colored box around them.
Create favicons for your website directly from BMP images — essential for browser tabs and bookmarks.
BMP files are extremely large because they're uncompressed. Converting to ICO will dramatically reduce file size.
BMP vs ICO — Format Comparison
| Feature | BMP | ICO |
|---|---|---|
| Full Name | BMP (Bitmap Image File) | ICO (Windows Icon) |
| Compression | Uncompressed / Lossless | Lossless |
| Transparency | ❌ No | ✅ Yes |
| Animation | ❌ No | ❌ No |
| Color Depth | Up to 32-bit | Up to 32-bit with alpha |
| Best For | Raw image data, Windows system graphics, situations requiring zero compression. | Website favicons, Windows application icons, desktop shortcuts. |
About the BMP Format
BMP (Bitmap) is an uncompressed image format native to Windows operating systems. Because it stores raw pixel data without any compression, BMP files are extremely large but preserve every single pixel with absolute fidelity. BMP is rarely used on the web due to its massive file sizes, but it remains relevant in Windows system graphics, legacy software, and scenarios where you need completely uncompressed image data for processing.
The BMP format was introduced by Microsoft in the early days of Windows as the native image format for the operating system. While it has been largely superseded by more efficient formats, it remains supported across virtually all image viewing and editing software.
✅ Advantages
- Zero quality loss — completely uncompressed
- Universal support on Windows systems
- Simple format — easy to read and write programmatically
- No patent or licensing restrictions
❌ Disadvantages
- Extremely large file sizes
- No compression means impractical for web use
- No transparency support
- No animation support
- Inefficient storage compared to PNG or WebP
About the ICO Format
ICO is the standard icon format used by Microsoft Windows and web browsers for favicons (the small icons displayed in browser tabs). An ICO file can contain multiple image sizes and color depths within a single file, allowing the operating system or browser to choose the most appropriate version. For web developers, creating a proper ICO favicon is essential for browser compatibility and professional website appearance.
The ICO format was created by Microsoft for use in the Windows operating system, dating back to Windows 1.0 in 1985. While modern browsers also support PNG favicons, ICO remains the most universally compatible format for website icons.
✅ Advantages
- Universal favicon format for all browsers
- Can contain multiple sizes in one file
- Full transparency support
- Required for older browser compatibility
❌ Disadvantages
- Limited to icon-sized images
- Not suitable for general image storage
- Larger than necessary for single-size icons
- Somewhat outdated — PNG favicons are increasingly preferred
Frequently Asked Questions
Is it free to convert BMP to ICO?
Yes, completely free with no limits. Our converter runs in your browser — no uploads, no registration, no hidden costs.
Will I lose image quality?
ICO uses lossless compression, so your image quality will be perfectly preserved during conversion.
Are my files uploaded to a server?
No. All image conversions happen 100% in your browser using the Canvas API. Your files never leave your device, making this the most private way to convert images.
Can I convert multiple BMP files at once?
Yes! Simply drag and drop multiple files or select them with the file browser. All files will be converted in batch with a single click.
Will my converted image have a transparent background?
If your original BMP image doesn't have transparency data, the converted ICO will have the same background. ICO supports transparency, but you'll need an image editor to make specific areas transparent.