Image to ICO
ImageConvert PNG, JPEG or WebP to ICO favicon format, with a full icon set from 16x16 to 256x256 packed into one .ico file so browsers pick the right size.
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About Image to ICO
This image to ICO converter transforms PNG, JPEG, and WebP images into ICO icon files locally in your browser. ICO is the Windows icon format: a file begins with an ICONDIR header followed by multiple ICONDIRENTRY directory entries, each embedding bitmap data at a different size. This tool generates multi-size ICO files (16x16 up to 256x256), using the Canvas 2D API to scale the source image into each target size and encode all of them into one ICO container. A common misconception is that an icon is just one size — in practice Windows and browsers pick the best entry for each scenario (taskbar, tab, address bar, context menu) and for the display's DPI scaling, so shipping multiple sizes gives crisp results everywhere. It is best to start from a square, subject-centered image so it reads well even at 16x16. Output works directly as a favicon.ico in a site root or as a Windows application icon, and everything runs locally so brand assets never leave your device.
How to Use
- Open the Image to ICO tool
- Upload the image file
- Adjust the output options as needed
- Click the Process button; results appear in real time
- Copy or export the result
Use Cases
- Website favicon — Convert brand logos to multi-size ICO files as favicon.ico to enhance browser tab recognition.
- Desktop app icons — Generate multi-size ICO icons for Windows desktop applications, adapting to different display scaling levels.
- Shortcut icons — Convert custom images to ICO format for Windows desktop or folder shortcut icons.
- Browser extension icons — Generate 16x16 and 48x48 ICO icon files for Chrome or Firefox extensions.
- Brand asset output — Batch-convert brand images to ICO format for delivery to development teams for Windows applications.
FAQ
What sizes does the ICO file include?
By default it includes 16x16, 32x32, 48x48, 64x64, 128x128, and 256x256. Browsers and the system auto-select the best size for each display scenario.
Why is the generated ICO file large?
Multi-size ICO files embed bitmap data at multiple resolutions. Uncheck large size options to reduce file size if only small icons are needed.
Will large icons look blurry?
No. A multi-size ICO renders each target size independently, and the system uses the most suitable entry for each scenario and DPI, so scaling stays sharp.
Does it support transparent backgrounds?
Yes. PNG transparency is preserved in the ICO file. Use PNG source images for the best transparency results.
Can JPEG images be converted to ICO?
Yes. PNG, JPEG and WebP input formats are supported. JPEG lacks an alpha channel, so the ICO background will be white.
Are images uploaded?
No. All conversion runs locally in your browser via the Canvas API, so brand design assets never leave your device.