How to convert BMP to ICO
- Add your .BMP file - drop it in the box above or click to browse.
- Convert it to .ICO in a few seconds.
- Download your new .ICO file.
What to expect
- ICO is a container - it can store images at several sizes (16×16, 32×32, 48×48, 256×256); a single-size
.icoworks but Windows may scale it for other contexts, which can look blurry. - Your
.bmpmust be square before converting - non-square images will be stretched or cropped by most tools. - Standard
.bmpfiles have no alpha channel, so the converted.icowill have no transparent background; add transparency in an editor first if your icon needs it.
Frequently asked questions
What BMP size gives the best ICO result?
256×256 pixels, square - that is the largest standard slot and gives Windows the sharpest image to scale down for taskbar and desktop use.
Can I use the converted ICO as a Windows application icon?
A single-size ICO works fine for folder icons and shortcuts; for
.exe icons that look sharp at every size, pack 16, 32, 48, and 256 px variants using ImageMagick or XnConvert.Does converting BMP to ICO lose quality?
Only if you scale up a small image - always start from the largest BMP you have and scale down to avoid blurriness.
Is the 256×256 ICO slot stored as PNG inside the file?
Yes - modern ICO files store the 256×256 slot as a compressed PNG internally, keeping the file size small; most converters handle this automatically.
Programs that convert BMP: Picture Resize Free Online Images Converter · Diagram Designer · PhotoFiltre Studio · FastStone Image Viewer · ACDSee Photo Manager · FastPictureViewer Professional · FormatFactory · Preview
