ICO: conversion steps
- Upload your ICO file to start.
- Convert ICO to AVIF.
- Download the ICO file.
About ICO files
the icon format of Windows and website favicons
ICO is the Windows icon format. One .ico file can hold several images of the same icon at different sizes.
Website favicons and the icons of Windows programs and shortcuts.
ICO: what conversion changes
Converting ICO re-encodes pixels.
ICO: settings to change
Before you convert ICO files, you can adjust: Width, Height, Scale fit, Crop position, Never enlarge, Quality, Lossless, Progressive, Remove metadata, Auto-orient from EXIF, Rotate, and Background.
Limits of the ICO format
Each image in an ICO file can be at most 256 × 256 pixels, so the format is not suited to photos.
Common questions about ICO
Why won't my image editor open the ICO file properly? A favicon file bundles the same icon at several sizes in one container, so most viewers show only the largest layer or open it distorted.
Why convert an image to ICO? A website favicon needs it — browsers ask for favicon.ico, and one ICO file carries every size from 16 to 256 pixels.