Transparent corners look black in some apps.

Some shells composite ICO transparency poorly. Try a solid background fill, or also ship PNG icons where supported.

Only one size appears in Windows.

Keep multiple layer sizes selected (16 through 256). Re‑export and confirm the ICO includes those layers.

Image to ICO Converter

Convert any image to a multi-size Windows ICO file in your browser. Free online ICO converter with background options.

About this tool

Icon Converter turns a source image into a multi‑size Windows ICO, with optional rounded corners and background fills for cleaner taskbar and desktop icons.

Best for: Creating a classic multi‑resolution .ico from a PNG or other bitmap for Windows apps and shortcuts.

How to use it

Upload a clear square source (larger than 256×256 when possible).
Optionally add rounded corners or a solid background.
Confirm the size layers you need (16 through 256).
Download the multi‑layer ICO and test it in Explorer or your installer.

Common problems and tips

Transparent corners look black in some apps. Some shells composite ICO transparency poorly. Try a solid background fill, or also ship PNG icons where supported.
Only one size appears in Windows. Keep multiple layer sizes selected (16 through 256). Re‑export and confirm the ICO includes those layers.

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App Icon Generator — Build iOS and Android app icon packages from one image.