ICO to BMP Converter — Uncompressed Windows Icon to BMP
Convert Windows ICO icons to uncompressed DIB BMP files online for free. Fast direct raster parsing with zero server uploads and instant browser speed.
Click or drag & drop Windows Icon (.ico) files here
Extracts highest-resolution embedded PNG or DIB payload • 100% Client RAM
ICO vs BMP: Technical Architectural Comparison
Comprehensive side-by-side evaluation across five core architectural layers of modern digital imaging.
1Part 1: Format Architecture & Standardization
| Evaluation Metric | ICO Icon Format | BMP Bitmap Format |
|---|---|---|
| Standard Authority | Microsoft Windows Icon Architecture | Microsoft Windows DIB Architecture |
| Binary Structure | 6-byte header + 16-byte entries + DIB/PNG | 14-byte BITMAPFILEHEADER + 40-byte DIB header |
| OS Integration | Shell icon resource and favicon storage | Native Windows Graphics Device Interface (GDI) |
2Part 2: Color Space & Rendering Pipeline
| Evaluation Metric | ICO Icon Format | BMP Bitmap Format |
|---|---|---|
| Compression Architecture | Uncompressed DIB or Deflate PNG | Completely uncompressed raw raster scanlines |
| Scanline Alignment | DIB mask scanline ordering | Bottom-up raster rows with 4-byte padding |
| Pixel Fidelity | Bit-exact bitmap reproduction | Byte-exact uncompressed raw pixel grid |
3Part 3: Web Performance & Asset Delivery
| Evaluation Metric | ICO Icon Format | BMP Bitmap Format |
|---|---|---|
| Resolution Scaling | Fixed discrete icon layers | Exact pixel dimensions (1x, 2x, 4x presets) |
| Color Representation | 1, 4, 8, 24, or 32-bit color | 24-bit TrueColor (8-bit BGR channel ordering) |
| Alpha Channel | Full 32-bit RGBA alpha supported | Opaque matte (solid white background fill) |
4Part 4: Alpha Transparency & Layer Compositing
| Evaluation Metric | ICO Icon Format | BMP Bitmap Format |
|---|---|---|
| Application Ecosystem | Windows explorer, desktop apps, favicons | Legacy Windows apps, Paint, CAD, embedded systems |
| GDI Blitting | Requires icon extraction API (DrawIconEx) | Direct BitBlt memory transfer without decoding |
| Dependencies | Requires multi-icon parser | Zero dependencies; reads directly in memory |
5Part 5: Software Interoperability & Longevity
| Evaluation Metric | ICO Icon Format | BMP Bitmap Format |
|---|---|---|
| File Size | Compact binary wrapper | Large uncompressed binary pixel buffer |
| Decoding Overhead | Directory traversal required | Zero decoding overhead; direct linear memory blit |
| Workflow Utility | UI iconography and shortcuts | Legacy industrial, gaming, and embedded Windows software |
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Frequently Asked Questions
Everything you need to know about converting Windows ICO icons to BMP format securely in browser memory.