What is ICO?
ICO is the icon container format used for classic browser favicons, Windows shortcuts, and some desktop app icons. One ICO file can include multiple square sizes, so each platform can choose the closest fit automatically.
Why use this converter?
This tool turns one local image into a multi-size ICO file directly in your browser. Nothing is uploaded, and you can bundle common favicon sizes like 16×16, 32×32, 48×48, and 256×256 into a single download.
How it works
- Upload one local image file.
- Choose the icon sizes you want to include in the ICO bundle.
- Optionally add a solid background color for transparent artwork.
- Generate the ICO and download it immediately.
Tips for better results
- Start with a sharp square image, ideally 512×512 or larger.
- Keep logos and key shapes away from the outer edges because tiny icons lose detail quickly.
- Leave background fill off if you want transparency, and turn it on only when you need a solid canvas behind the icon.