Select ICO files
ICO files will be converted to PNG format and compressed. PNG format has better compression ratios and modern browser compatibility while maintaining transparency support.
Compress ICO
Optimize ICO favicon files. Reduce icon file size for faster website loading.
Select ICO files
or drop files here
Maximum file size: 50MB per file
Convert to a modern format for better compression. WebP is recommended for best results.
Super Fast
Process multiple files in seconds with our optimized browser-based tools.
100% Secure
All processing happens in your browser. Your files never leave your device.
High Quality
Keep your files clear and usable while reducing size or converting formats.
Compress, convert & crop images offline on iPhone — privacy-first, batch 200
Compress to Target Size
Quickly compress your files to specific file sizes
Related Tools
Compress WebP
Optimize WebP images for better performance. Reduce WebP file size efficiently.
Compress SVG
Optimize SVG vector graphics for web. Remove unnecessary code and reduce file size efficiently.
Compress AVIF
Compress AVIF images for next-gen web performance. Reduce file size efficiently.
Compress PNG
Reduce PNG file size up to 80% while maintaining quality. Fast, secure, and free.
Compress TIFF
Compress TIFF images for photography and print. Reduce file size while preserving professional quality.
Compress JPG
Compress JPG/JPEG images without losing quality. Reduce file size instantly.
About ICO Compression
ICO (Icon) is the standard format for favicons and application icons. Our ICO compression tool optimizes these small but important files, ensuring fast loading times for your website favicons and app icons without sacrificing sharpness and clarity.
How to Use This Tool
-
1
Select Your Files
Click the upload button or drag and drop your files into the upload area. You can select multiple files at once.
-
2
Start Processing
Choose the settings you need, then start the tool. Processing happens in your browser and results appear in real time.
-
3
Download the Results
Download your processed files individually or all at once when the task is complete. Your original files remain unchanged.
Frequently Asked Questions
Will processing reduce quality?
It depends on the tool and the settings you choose. Many tools balance smaller file sizes with usable quality, and some actions like formatting or archive creation do not reduce quality at all.
Are my files safe and private?
Absolutely. All processing happens locally in your browser. Your files are never uploaded to our servers or transmitted over the internet, which helps keep your documents, media, and other files private.
What's the maximum file size?
Most tools accept files up to 50MB each. For larger files, try splitting them into smaller batches or using a different format.
How much can I reduce file size?
Results vary depending on the file type, content, and tool settings. Many files can often be reduced by 30-80%, while some tools focus on compatibility, cleanup, or conversion instead of maximum size reduction.
Why Choose Let Compress?
- No file upload required - 100% client-side processing
- Free to use with no registration needed
- Batch compress multiple files at once
- Optimized compression algorithms for best results
- Works on all modern browsers and devices
- No file size limits or compression quotas
Learn More About Image Compression
Explore these authoritative resources to deepen your understanding of image compression and optimization.
MDN Web Docs: Image Optimization
Comprehensive guide on image optimization for web performance by Mozilla.
Google Web Fundamentals: Image Optimization
Best practices for image optimization from Google's web performance team.
W3C WebP Specification
Official W3C specification for the WebP image format.