Convert Windows Icon (.ico) to Bitmap Image (.bmp) online for free. Fast, secure image conversion with no watermarks or registration.
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ICO (Windows Icon) is a multi-resolution container format that embeds multiple images at standard sizes like 16x16, 32x32, 48x48, and 256x256 pixels within a single file. ICO files are used for Windows application icons and website favicons. BMP (Bitmap) is the simplest uncompressed raster format, storing raw pixel data that any image viewer or editor can open. Converting ICO to BMP extracts the largest embedded image from the ICO container and saves it as a flat, uncompressed bitmap.
This conversion is useful when you need to edit, inspect, or use an icon image in applications that do not understand the ICO multi-resolution container format. Most image editors, web platforms, and design tools cannot open ICO files directly but handle BMP without any issues.
ICO is a specialized format understood only by Windows shell, web browsers (for favicons), and a few icon editors. When you need to view, edit, or repurpose an icon image in a standard image editor like Photoshop, GIMP, or Paint.NET, converting to BMP provides the most straightforward uncompressed representation of the icon's pixel data.
BMP output is also useful for embedded systems, firmware, and legacy applications that need raw pixel data from icon images. Display controllers, boot screens, and custom OS shells that read BMP directly can use the extracted icon data without implementing ICO container parsing.
The ICO container is parsed to identify all embedded image entries and their resolutions. The largest resolution image (typically 256x256 for modern icons, or 48x48 for older icons) is extracted. If the 256x256 entry is stored as embedded PNG data (common in Windows Vista+ icons), it is decoded from PNG to raw pixels. Older ICO entries stored as BMP-format device-independent bitmaps are extracted directly. The pixel data is written as a standard Windows BMP v3 file with 24-bit (RGB) or 32-bit (RGBA) color depth. Alpha channel data from 32-bit ICO entries is preserved in the BMP output. Sharp handles the ICO decoding.
No quality loss occurs during conversion. ICO images are stored either as uncompressed bitmaps or as lossless PNG data within the container. The BMP output is a pixel-perfect representation of the extracted icon image. The only limitation is resolution -- ICO images are small by design (typically 256x256 maximum), so the BMP output will also be small.
| Device | ICO | BMP |
|---|---|---|
| Windows PC | Native | Native |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
ICO to BMP extracts the highest-resolution icon image into a universally readable format. Use it when you need to edit or inspect icon images outside of specialized icon editors.
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| Χαρακτηριστικό | ICO | BMP |
|---|---|---|
| Πλήρες όνομα | Windows Icon | Bitmap Image |
| Επέκταση | .ico | .bmp |
| Ιδανικό για | Windows icons | Uncompressed |