Convert Images to ICO Format
Need to transform images to ICO? Our tool makes it easy to convert from PNG, WebP, AVIF, GIF, BMP and other formats to ICO with optimal quality settings.
- Support for multiple files at once
- Your images stay crisp and clear
- Quick conversions that save you time
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Common ICO Conversions
ICO is a file format used for computer icons in Windows. It can contain multiple images of different sizes and color depths to support various display scenarios.
Multiple Sizes
ICO files can contain multiple images of different resolutions in a single file.
Transparency Support
ICO supports alpha channel transparency for modern icons.
Windows Compatibility
ICO is the native icon format for Windows systems and applications.
Complete Guide to ICO Conversion
ICO is the essential format for website favicons and Windows application icons. Unlike regular image formats, ICO files can contain multiple sizes (16x16, 32x32, 48x48, 256x256) in a single file - allowing the operating system or browser to pick the best size for each context. Converting to ICO is straightforward but important for any website or Windows application.
How to Convert to ICO
Upload your source image
Start with a square image - ideally at least 256x256 pixels. PNG with transparency works best for modern icons with smooth edges.
Select ICO output
Choose ICO from the format options. The converter will automatically generate multiple sizes from your source image.
Review generated sizes
Standard ICO includes 16x16, 32x32, and 48x48 for maximum compatibility. Add 256x256 for high-DPI displays and Windows 10/11 desktop icons.
Download your ICO
Your multi-resolution ICO is ready. For websites, place it at /favicon.ico in your site root and add appropriate link tags in your HTML head.
Pro Tips for ICO Conversion
- 💡Always start with a transparent PNG - ICO preserves alpha transparency for smooth edges on any background
- 💡Test your favicon in browser tabs and bookmarks - tiny 16x16 pixels need simple, recognizable designs
- 💡Windows application icons should include 256x256 for the Start menu and high-DPI displays
- 💡For web favicons, also generate apple-touch-icon.png (180x180) for iOS devices
- 💡Simple, high-contrast designs work best at small sizes - avoid fine details that disappear at 16x16
ICO is Ideal For
- ✓Website favicons (the icon in browser tabs)
- ✓Windows desktop application icons
- ✓Desktop shortcuts
- ✓File type associations in Windows
- ✓Toolbar and system tray icons
Technical Details
ICO is a container format that stores multiple BMP or PNG images at different resolutions. Modern ICO files use PNG compression for sizes 256x256 and larger. Standard sizes are 16, 32, 48, and 256 pixels square. Alpha channel transparency is supported for smooth edges on any background.
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I love the bulk option — Squoosh doesn't support it
That's pretty nice!
Great job, btw.
That's really impressive, thanks for sharing! I'm blown away by how fast it is
Looks and functions really nice!
Good stuff
Very clean
That's impressive
This is by far the best converter. Thank you for your work!
Worked great!
I love this so much, it's very easy to use and straightforward. It also took less than a minute in compressing my image.
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