Convert BMP to ICO Online - Free, Local & Instant
Convert BMP (image/bmp) to Multi-Size Favicon ICO (16x16, 32x32, 48x48, 64x64) (.ico) locally in your browser using HTML5 Canvas. Adjust compression quality, resize in pixels, and download instantly with zero server uploads.
Technical Comparison: BMP vs ICO
Images & Game/Web Assets| Specification | BMP (Source) | ICO (Target) |
|---|---|---|
| Format Name | Windows Bitmap (DIB) | Multi-Size Favicon ICO (16x16, 32x32, 48x48, 64x64) |
| MIME Type | image/bmp | image/x-icon |
| Transparency / Alpha | Yes (32-bit RGBA DIB) | Preserved for PNG, WEBP, AVIF, ICO, SVG, BMP |
| Compression Profile | Uncompressed raw pixel buffer | multi-resolution favicon.ico bundle for browsers, Windows apps, and game clients |
| Processing Engine | Native Browser Image Decoder | HTML5 Canvas + Client-Side Binary Encoder |
BMP to ICO — Before & After Example
Input File: asset.bmp MIME Type: image/bmp Alpha: Yes (32-bit RGBA DIB) Compression: Uncompressed raw pixel buffer Decoding: Browser HTML5 Image + Canvas 2D Context
Output File: favicon.ico (Binary Multi-Resolution Container) Embedded PNG Frames: 16x16, 32x32, 48x48, 64x64 (32-bit RGBA) Header: 6-byte ICONDIR + 4x16-byte ICONDIRENTRY directory Usage: <link rel="icon" href="/favicon.ico" sizes="any" />
Frequently Asked Questions: BMP to ICO
Does converting BMP to ICO upload my images to a remote server? ▾
Never. Every BMP file you select is decoded directly in your browser using the HTML5 Canvas API and FileReader API. Your images stay in your computer or phone RAM at all times.
Can I resize and adjust compression quality when converting BMP to ICO? ▾
Yes. Use the Quality slider (10%–100%) and the Width/Height pixel inputs above the drop zone. Keeping "Lock Ratio" checked preserves your original aspect ratio automatically.
Does this converter support batch BMP to ICO conversion with ZIP download? ▾
Yes. Drag and drop multiple BMP files at once; you can download each converted ICO individually or click "Download All (.ZIP)" to bundle them locally via JSZip.
Why use ICO instead of BMP? ▾
Converting BMP to ICO gives you multi-resolution favicon.ico bundle for browsers, Windows apps, and game clients while keeping full control over pixel dimensions and byte size.