Convert BMP images to ICO online for free. Upload one file or many, choose the quality and maximum size, then download the ICO results one by one or all together in a ZIP. No sign-up needed.
BMP is a simple image format from Windows that usually stores pixels with little or no compression, so files are large compared with JPG, PNG or WebP. It is rarely used on the web, and converting a BMP is the easiest way to make it small enough to share.
More BMP conversionsICO is the Windows icon format, and browsers also use it for favicons. A single .ico file can hold several sizes of the same icon, from 16x16 up to 256x256, so the right one is shown wherever it is needed.
More ICO conversions| Feature | BMP | ICO |
|---|---|---|
| Full name | Bitmap | Windows Icon |
| Compression | Usually uncompressed | PNG or BMP images inside |
| Transparency | No | Yes |
| Animation | No | No |
| Introduced | 1990 | 1985 |
| Developed by | Microsoft | Microsoft |
| Best for | Legacy Windows software | Favicons and Windows icons |
Click Select File or drop your BMP file onto the upload box. Pick the quality and maximum size, and the converted ICO appears in the list below with a download button. You can add many files at once and download them together as a ZIP.
Yes. There is no sign-up and no watermark. To keep the service available for everyone there is a 95MB limit per file and a cap on how many files one connection can process in a short period.
Your upload is used only to make the converted file. Images are processed in memory; other files are written to a private temporary folder that is deleted as soon as the conversion finishes. Nothing is kept after the result has been sent back.
For images, a little, by design: the image is re-encoded at the Quality you choose (default 75%). Audio and video are re-encoded with high-quality settings; documents keep their text and layout as far as the target format allows. Converting never restores detail that is already missing from the original.