ICO → PNG Converter

Drag & Drop your .ico file here, or pick a file below. Nothing is uploaded.

Icon size in ICO

Many ICOs contain multiple sizes (e.g., 16x16, 32x32, 64x64, 256x256). Pick the one to convert.

Background

Transparent

Uncheck to flatten onto a solid color.

Output width (px)

Leave blank to use icon's intrinsic width.

Output height (px)

If one dimension is blank, aspect ratio is preserved.

Render to preview PNG here.

ICO entry size:

Output size:

ICO → PNG - Quick Cheat Sheet

Multiple sizes: ICO can bundle several bitmaps. Use the Icon size dropdown to pick which to convert.
PNG-compressed entries: Many modern ICOs store PNG data internally. This tool prefers those for exact fidelity.
Fallback rendering: If a selected entry isn't PNG-compressed, the tool can still render the overall ICO via the browser's decoder.
Transparency: PNG supports alpha. Keep Transparent on, or set a solid Background color.
Sizing: Set output width/height. If only one is set, the other is computed to preserve aspect ratio.
Privacy: All work is done locally in your browser; nothing is uploaded.

ICO parsing details

Header: reserved=0, type=1 (icon), count=n.
Each entry has width, height, color count, planes, bit count, bytesInRes, and imageOffset.
If the entry data begins with PNG signature (89 50 4E 47 0D 0A 1A 0A), it's PNG-compressed; we extract and use it losslessly.
Non-PNG (DIB/BMP) entries are drawn via browser fallback on the whole ICO when possible.