How to convert BMP to ICO
- Choose or drop your BMP files. You can add several at once.
- Check that “To” is set to ICO.
- Press “Convert to ICO” and download the results — or all of them as one ZIP.
BMP vs ICO
BMP — Bitmap image. BMP is an uncompressed Windows image format. Files are very large because every pixel is stored as-is, so it is rarely used outside older Windows software.
ICO — Windows icon. ICO is the icon format used for website favicons and Windows app icons. One .ico file holds the same picture at several sizes, so it looks crisp in a browser tab, on a taskbar and on a desktop.
Convert BMP to ICO when you need a file for favicons and Windows icons. BMP is better suited to legacy Windows programs.
FAQ
5Are my files uploaded anywhere?
No. The conversion runs in your browser using your own device’s processor. Your files are never sent to a server, so nobody — including us — can see them. You can even disconnect from the internet after the page loads.
Will I lose quality?
The icon contains six sizes — 16, 32, 48, 64, 128 and 256 pixels — each stored as a PNG, so transparency is kept. Non-square images are centred on a transparent square rather than stretched. Start from a simple, high-contrast picture: fine detail disappears at 16 pixels.
Is there a file size or daily limit?
No limits, and no sign-up. Because nothing is uploaded, we don’t pay for your conversions and have no reason to cap them. Very large files are limited only by your device’s memory.
Can I convert many BMP files at once?
Yes. Add as many files as you like; each is converted to ICO, and “Download all” saves them together as a ZIP.
Does it work on iPhone and Android?
Yes. It works in any modern browser — Safari, Chrome, Firefox or Edge — on phones, tablets and computers. Older or low-memory phones may be slower with very large files.