Image to ICO Converter (Favicon)

How it works

1. Select an image from your device using the file picker (ideally square and with good resolution).
2. Check the sizes you want to include in the .ico: 16×16, 32×32, 48×48, 64×64, 128×128, and/or 256×256 pixels.
3. For each selected size, the image is redrawn onto a <canvas> of that size and encoded as PNG.
4. The resulting PNGs are packaged into a hand-built ICO container (an ICONDIR header plus one ICONDIRENTRY per size) — the same format favicon generators use.
5. Download the final favicon.ico file, ready to upload to your website's root.

Use cases

• Generate a website's favicon.ico from a PNG or JPEG logo.
• Create a multi-resolution icon for a Windows desktop application.
• Convert a square logo into an .ico compatible with browsers and older systems that still expect that format.
• Produce several icon sizes in a single file without using desktop software.

Frequently asked questions