UnlimitedConvert
BMP to ICO Converter
Turn BMP files into ICO in seconds. Everything happens on your device: nothing is uploaded, and there's no limit.
Your images are processed in this browser tab and never uploaded.
Why convert BMP to ICO?
BMP files are uncompressed and very large.
Browsers and Windows need ICO for favicons and app icons.
What to expect
- One ICO file is created with 16, 32, 48, 64, 128 and 256 pixel sizes. Non-square images are centred on a transparent square.
How to convert BMP to ICO
Add your files
Drop your BMP files into the box or tap “select files”. Add as many as you like.
Pick the options
Nothing to set: every favicon size from 16 to 256 pixels goes into one file.
Convert and download
Press Convert. Download each ICO on its own, or everything at once as a ZIP file.
BMP vs ICO
| BMP | ICO | |
|---|---|---|
| Full name | Windows Bitmap | Windows Icon |
| Compression | Lossless | Lossless |
| Transparency | No | Yes |
| Animation | No | No |
| Best for | old Windows programs, embedded devices and tools that require uncompressed images | website favicons and Windows app icons |
| Support | Opens on Windows, macOS and most image editors. | Used by all browsers for favicons and by Windows for icons. |
About the formats
BMP (Windows Bitmap, 1990) is a simple, uncompressed Windows format. Files are large because every pixel is stored as-is, but almost any program, including very old software and embedded devices, can read it.
ICO (Windows Icon, 1985) is the icon format used by Windows and by website favicons. One ICO file can hold several sizes (16×16 up to 256×256), so the right one is shown in tabs, desktops and taskbars.
Frequently asked questions
How do I convert BMP to ICO?
Drop your BMP files into the box above (or tap Select files), check the options, then press Convert. Each ICO downloads on its own, or you can download them all as one ZIP file.
Are my files uploaded anywhere?
No. The conversion runs entirely in your browser on your own device. Your BMP files are never sent to a server, so they stay private, and it works even on a slow connection once the page has loaded.
Is there a limit on how many BMP files I can convert?
No. Convert as many as you like, for free, without signing up. Very large batches are processed one after another so your browser stays responsive.
What size should a favicon be?
Modern sites use a 32×32 favicon, with 16×16 for older browsers and larger sizes for shortcuts. This converter puts 16, 32, 48, 64, 128 and 256 pixel versions into one ICO file, so you only need one. Use a square image for the best result.
Will I lose quality converting to ICO?
No. ICO is lossless, so the converted image keeps every pixel of the original.
Does it work on iPhone and Android?
Yes. It works in Safari, Chrome, Firefox and Edge on phones, tablets and computers. Nothing to install.