BMP to ICO Converter

Summary

Upload a BMP image and instantly download a multi-size .ico file (16, 32, 48, 64 px) — no server, no account needed.

How it works

1. Click "Choose BMP File" and select any .bmp image from your device.
2. The tool renders the BMP onto four Canvas elements at 16x16, 32x32, 48x48, and 64x64 pixels.
3. Each canvas is read as raw RGBA pixel data and encoded as a 32-bit BMP DIB bitmap.
4. A valid ICO file header is assembled in memory, referencing all four bitmap images.
5. The finished .ico binary is offered as an instant browser download — no upload, no server.

Use cases

• Create a multi-resolution favicon.ico from a BMP logo or artwork.
• Package a BMP graphic as a Windows desktop or taskbar icon.
• Convert a BMP to ICO for use in Electron or desktop application projects.
• Produce a quick icon asset without installing Photoshop or GIMP.
• Generate multiple icon sizes from a single source BMP in one step.
• Prepare icons for browser extension manifests that require .ico format.
• Convert scanned or legacy BMP artwork into modern icon format.

Frequently Asked Questions