Drop or paste images
Settings
Images are processed locally on your device, ensuring privacy.
Set image quality
Higher values retain more detail, while lower values result in smaller file sizes.
Limit file size
Try to compress the image to a target file size.
Keep original dimensions
Do not alter the width and height of the image.
Limit dimensions
Limit the width and height of the image.
Default
JPG
Effective at reducing file size of large photos and images, with some quality loss.
PNG
Preserves image sharpness, colors, and transparency, but may result in large files.
WebP
Retains good details and transparency, may affect colors slightly at low quality settings.
ICO
Mainly used for website favicons and Windows file icons
Free ICO Compressor - Compress ICO Icon Files Online
Compress ICO icon files online for free with our specialized compression tool. ICO files are primarily used for favicons and Windows application icons. Our compressor optimizes these files to reduce size while maintaining the crisp, clear appearance essential for icons across different sizes and resolutions.
What is ICO Compression?
ICO compression optimizes icon files that contain multiple image sizes within a single file. Our free ICO compressor uses advanced algorithms specifically designed for icon optimization, reducing file sizes while preserving the visual quality essential for professional icons and favicons.
Benefits of ICO Compression
Faster Website Performance
Smaller favicon files load faster, improving overall website performance and user experience. Optimized favicons contribute to better page speed scores.
Storage Space Optimization
Reduce storage space used by icon collections, application resources, and favicon libraries. Save bandwidth and server storage costs.
Enhanced Application Performance
Optimized ICO files improve application startup times and reduce memory usage. Better performance for Windows applications and desktop software.
Multi-Resolution Quality
Maintain visual quality across all icon sizes including 16x16, 32x32, 48x48, 64x64, 128x128, and 256x256 pixels.
How Our ICO Compressor Works
Complete Privacy and Security
- All compression happens locally in your browser
- No files uploaded to external servers
- Complete privacy protection guaranteed
- Your icon files never leave your device
Icon-Specific Optimization
- Preserves multiple icon sizes within single ICO file
- Maintains transparency and alpha channels
- Optimizes color palettes intelligently
- Reduces redundant data across resolutions
Efficient Processing Technology
- Fast compression algorithms optimized for icons
- Batch processing for multiple files
- Real-time preview at different sizes
- Advanced quality control options
Key Features
- Multi-Size Support: Compress ICO files containing multiple icon resolutions
- Transparency Preservation: Maintain alpha channels and transparency
- Color Optimization: Smart palette reduction for smaller file sizes
- Batch Processing: Compress multiple ICO files simultaneously
- Quality Control: Adjustable compression levels for optimal results
- Format Conversion: Convert other image formats to optimized ICO
When to Use ICO Compression
Website Favicon Optimization
Optimize favicons for faster website loading without compromising visual quality. Essential for professional websites and web applications.
Windows Application Development
Reduce application icon file sizes for better performance and easier distribution. Perfect for desktop software and Windows applications.
Game Development Projects
Compress game icons and interface elements for optimal performance. Reduce resource usage in gaming applications.
Custom File System Icons
Optimize custom folder and file icons for Windows Explorer and file management applications.
Favicon Size Recommendations
Standard Favicon Sizes
- 16x16: Basic favicon for browser tabs
- 32x32: High-DPI browser support
- 48x48: Windows desktop shortcuts
- 64x64: Windows taskbar icons
- 128x128: Chrome Web Store
- 256x256: High-resolution displays
Step-by-Step Guide
- Upload Files: Use drag and drop or click to select ICO files
- Configure Settings: Choose compression level and optimization options
- Preview Results: Review compressed icons at different resolutions
- Download Files: Get your optimized ICO files instantly
Frequently Asked Questions
Is ICO compression completely free?
Yes, our ICO compressor is completely free with no limitations on file size, number of icons, or usage frequency.
What sizes should my favicon ICO include?
For optimal compatibility, include 16x16, 32x32, and 48x48 pixel sizes. Modern favicons often include 64x64, 128x128, and 256x256 sizes.
How much can ICO files be compressed?
Compression results vary by content. Simple icons can achieve 30-70% size reduction, while complex multi-size ICO files typically compress by 20-40%.
Do ICO files support transparency?
Yes, ICO files support transparency through alpha channels, making them perfect for favicons and application icons with transparent backgrounds.
Should I use ICO or PNG for favicons?
ICO is recommended for favicons as it can contain multiple sizes in one file and has better support across all browsers and platforms.
Can I convert other formats to ICO?
Yes, our tool can convert PNG, JPEG, and other image formats to ICO while applying optimization.
Technical Specifications
- Supported Input Formats: ICO, PNG, JPEG, WebP, HEIC
- Output Format: ICO
- Resolution Support: 16x16 to 256x256 pixels
- Transparency Support: Full alpha channel preservation
- Color Depth: 1, 4, 8, 16, 24, and 32-bit
- Browser Support: All modern browsers
- File Size Limit: Based on device memory
- Processing Speed: Instant compression
Start Compressing ICO Files
Optimize your ICO icon files instantly with our free, secure, and efficient compression tool. Perfect for web developers, application designers, and anyone working with icon files.