Image to ICO Converter
Convert images to ICO format for favicons
This free online image to ico converter runs in your browser and is part of our Image Tools collection.
Image to ICO Converter
Convert images to ICO format for favicons and icons
About ICO Format
- ICO is the standard format for Windows icons and favicons
- Multiple sizes can be included in a single ICO file
- Common sizes: 16x16, 32x32, 48x48 for desktop applications
- Use 16x16, 32x32 for favicons in browsers
- The converter resizes your image to square dimensions
- Output uses PNG compression for better quality
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Instant In-Browser Execution
Runs locally in JavaScript without wait times or server delays.
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100% Privacy & Security
Your inputs and files are never stored or logged on remote servers.
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Cross-Device Responsive
Fully optimized for mobile smartphones, tablets, and desktop displays.
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100% Free Forever
No subscription fees, no signups, and no software installations.
How to Use the Online Image to ICO Converter
1
Upload Source Image
Select a high-resolution logo or square icon (PNG with transparent background recommended).
2
Select Included Resolutions
Choose icon sizes to bundle into the `.ico` container: 16x16, 32x32, 48x48, 64x64, 128x128, and 256x256.
3
Convert to Multi-Resolution ICO Container
Click "Convert to ICO" to assemble the binary Windows Icon header and bitmap directory entries.
4
Download favicon.ico
Download the compiled `favicon.ico` file and place it in the root folder of your website.
Frequently Asked Questions
Common questions about using this free online image to ico converter.
What makes a true `.ico` file different from a renamed `.png`? ▾
A true Windows `.ico` file is an encapsulation container that holds multiple icon resolutions (e.g. 16x16, 32x32, and 48x48) within a single binary file. Simply renaming `image.png` to `favicon.ico` causes rendering issues in Windows Explorer and legacy browsers.
Where should I place the `favicon.ico` file on my web server? ▾
Place it in the root document directory of your domain (e.g. `https://example.com/favicon.ico`). Web browsers and search engine crawlers automatically look for this file at the root by default.
Does this ICO generator support transparency? ▾
Yes. 32-bit RGBA alpha transparency is fully preserved across every generated icon layer.
Can I use this generated `.ico` for Windows desktop application icons? ▾
Yes! The generated `.ico` file contains standard 48x48 and 256x256 frames, making it fully compatible with Windows .exe application executables, C# / Electron builds, and shortcut icons.
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