ICO → AVIF Converter

Drag & Drop your .ico file here, or pick a file below. Nothing is uploaded.
Note: Multi-size ICOs will decode to one embedded size (browser-chosen).
Blank = use decoded ICO width (or maintain aspect when only height is set).
Blank = compute from width using aspect ratio.
Higher = larger file, potentially better detail.
Keep transparency
Uncheck to flatten onto a solid color before encoding.
Load an ICO to preview here.
Decoded size:
Output size:

ICO → AVIF - Quick Cheat Sheet

Troubleshooting
  • "AVIF not supported": Try the latest Chrome, Edge, Firefox, or Safari 16+.
  • "Failed to decode ICO": Some browsers can't decode certain ICO variants. Converting ICO ? PNG first may help.
  • Huge sizes: Extremely large outputs can exhaust memory. This tool caps canvas dimensions for safety.

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