Convert BMP to ICO
Free online BMP to ICO converter. Drop an image below and convert it instantly — right in your browser, with no upload and no sign-up.
100% private — your image is processed in your browser and never uploaded.
Why convert BMP to ICO?
BMP is an uncompressed raster format from early Windows. It preserves every pixel but produces very large files, so it is mainly used for compatibility with legacy software. ICO is the Windows icon container, used for application icons and website favicons. It can hold one or more small images, typically 16x16 up to 256x256 pixels.
- ICO supports transparency, so you can later cut out backgrounds — something BMP cannot store.
- Generate a Windows favicon or app icon — ICO is the format browsers and Windows expect for icons.
- Replace the bulky, uncompressed BMP with a much smaller ICO file at the same visual quality.
How to convert BMP to ICO
- Upload your BMP file. Drag and drop your BMP image into the box above, or click to browse. Files up to 5 MB are supported.
- Adjust settings (optional). ICO is lossless, so there are no quality settings to adjust — just convert.
- Click "Convert to ICO". The conversion runs instantly in your browser. Nothing is sent to a server.
- Download your image. Click the download button to save your new ICO file to your device.
BMP vs ICO
| Property | BMP | ICO |
|---|---|---|
| Compression | Lossless | Lossless |
| Transparency | No | Yes |
| Best for | legacy Windows applications and workflows that require raw, uncompressed bitmaps | website favicons and Windows application/desktop icons |
Frequently asked questions
Is the BMP to ICO converter free?
Yes. ConvertPix is completely free with no limits on the number of conversions, no watermarks, and no account required.
Are my BMP images uploaded to a server?
No. Conversion happens entirely inside your web browser using your own device. Your images are never uploaded, stored, or seen by anyone.
Will I lose quality converting BMP to ICO?
No. ICO is a lossless format, so every pixel from your source image is preserved exactly.
Does ICO support transparency?
Yes, ICO supports a transparency (alpha) channel, so transparent areas are preserved.
What is the largest file I can convert?
You can convert BMP images up to 5 MB. Because processing is done on your device, very large images depend on your device's available memory.