// ABOUT ICO
ICO is the standard Windows icon container format used for favicons and application icons. A single ICO file can embed multiple resolutions (16x16, 32x32, 48x48, 256x256) so the operating system or browser can select the most appropriate size. ICO is the required format for the classic favicon.ico file that browsers request from every website.
// ABOUT QOI
QOI (Quite OK Image) is a modern lossless format designed for speed rather than maximum compression. It encodes and decodes 3–10x faster than PNG while producing files of comparable size. QOI is particularly valuable in developer toolchains, game asset pipelines, and real-time applications where CPU time is more important than file size.
// WHY CONVERT
Converting ICO to QOI is useful when you need your image in a format suited for game asset pipelines, real-time texture streaming, build tools, developer workflows, and any context where encode/decode speed is critical. Image Toolz runs the entire conversion directly in your browser. Nothing is uploaded to any server — your files remain completely private on your device. The tool handles images up to 200 MB and most conversions complete in under a second.
// FAQ
What is ICO?
ICO is the Windows icon container format embedding images at various sizes.
What is QOI?
QOI is a lossless format optimised for fast encode/decode in developer contexts.
Will converting ICO to QOI lose quality?
No. QOI is lossless. Every pixel from the icon is preserved exactly.
Is it safe to convert my files here?
Yes. All conversion runs entirely in your browser. Your images are never uploaded to any server and nothing leaves your device.