Does BMP support transparency when converting to ICO?

Standard BMP does not support transparency, so converted ICO files will have a solid background. For transparent icons, use a PNG or WebP source image instead.

What is the ideal BMP source size for ICO conversion?

Use a square BMP of at least 256×256 pixels. The tool scales it down to all ICO sizes — a larger source gives sharper 16×16 and 32×32 results.

What ICO sizes are generated from BMP?

The generated ICO contains 16×16, 32×32, 48×48, 64×64, 128×128, and 256×256 pixels packed into a single .ico file.

Can I use the ICO as a website favicon?

Yes. Place favicon.ico in your site root and add to your HTML . All browsers recognise the ICO format natively.

BMP to ICO

Convert BMP bitmap images to ICO icons

Drag and drop your file here

or click to browse files • Max 50MB

Tips:

•Use PNG source files with transparency — the alpha channel is preserved in the ICO output
•A larger source image (512×512 or higher) produces sharper icons at every ICO size
•ICO files bundle multiple sizes (16×16 to 256×256) so Windows and browsers pick the best fit automatically
•For favicons, add <link rel="icon" href="favicon.ico"> to your HTML <head>

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