BMP to ICO Converter - beta

About BMP to ICO Conversion

BMP (Bitmap) is a standard image format with uncompressed pixel data, commonly used in Windows environments.

ICO (Icon) is a specialized image format used for Windows icons and website favicons, supporting multiple sizes and color depths in a single file.

This converter transforms your BMP images into ICO format with multiple icon sizes in a single file. ICO files are perfect for website favicons, application icons, and Windows desktop shortcuts.

How to Convert BMP to ICO Images

1. Upload your BMP image by dragging and dropping or using the file browser
2. Select the icon sizes you want to include (multiple sizes can be included in a single ICO file)
3. Adjust the quality slider to balance between appearance and file size
4. Choose color depth and transparency options
5. Click the "Convert to ICO" button
6. Download your converted ICO file

ICO Conversion Options

Icon Sizes

ICO files can contain multiple icon sizes in a single file:

• 512x512: Ultra high-resolution for Retina displays and modern OS interfaces
• 256x256: High quality for modern displays and high-DPI screens (Windows 10/11)
• 128x128: Good for desktop applications and folder icons
• 64x64: Standard size for desktop icons (Windows 7 and later)
• 48x48: Used in Windows Explorer and file views
• 32x32: Standard size for small desktop icons and application toolbars
• 16x16: Used for website favicons and small menu icons

Quality Setting

The quality slider affects several aspects of icon generation:

• Image Compression: Higher quality uses less compression for better details
• Anti-aliasing: Higher quality applies better edge smoothing
• Dithering: Higher quality uses more sophisticated color blending techniques
• Detail Preservation: Higher quality retains more fine details when scaling

Based on the Icons8 article, different quality levels are recommended for different uses:

• High Quality (90-100%): Best for application icons, desktop icons, and professional use
• Medium Quality (75-89%): Good for website icons and general purpose use
• Low Quality (60-74%): Suitable for small UI elements and when file size matters most

Auto-select Sizes

When enabled, this feature will automatically select the most appropriate icon sizes based on your quality setting:

• High Quality: Includes all standard sizes (16×16 to 256×256, plus 512×512 at maximum quality)
• Medium Quality: Includes most common sizes (16×16, 32×32, 48×48, 64×64, 256×256)
• Low Quality: Includes only essential sizes (16×16, 32×32, 64×64)

Color Depth

Controls the number of colors in your icon:

• 32-bit: 16.7 million colors with transparency (recommended)
• 24-bit: 16.7 million colors without transparency
• 8-bit: 256 colors (smaller file size)
• 4-bit: 16 colors (smallest file size)

Additional Options

• Preserve Transparency: Maintains transparent areas from the source BMP (if present)
• Optimize for Web Favicon: Ensures compatibility with web browsers
• Bundle All Sizes: Creates a single ICO file with all selected dimensions