ICO Generator

Create multi-size .ico icon files from any image. Free, runs in browser, no signup.

📁

Drop your image here

Square images work best. JPG, PNG, WebP supported.

Accepted: image/* · Max: 10 MB

About ICO Generator

The .ico format is Windows' native icon container — one file holding multiple resolutions so an icon looks sharp in a tiny taskbar and a large desktop view alike. Windows apps, shortcuts, and legacy browser favicons all expect it.

This tool converts a PNG or JPG into a proper multi-resolution .ico containing the standard sizes (16, 32, 48, 256 px), generated entirely in your browser — no sketchy converter sites required.

How to use ICO Generator

1
Upload your image
A square PNG with transparency gives the cleanest result.
2
Select resolutions
Keep the standard set — Windows picks the right size for each context automatically.
3
Generate the .ico
All sizes are rendered and packed into a single .ico file locally.
4
Use it
Assign it to app builds, folder icons, or shortcuts, or serve it as /favicon.ico.

Tips for better results

✓Include 256px in the set — modern Windows displays large icons and upscaled small ones look terrible.
✓Transparent backgrounds make icons sit naturally on any desktop or theme.
✓For folder icons: right-click the folder → Properties → Customize → Change Icon.

Frequently Asked Questions

What is an ICO file? +

An ICO file is an icon format used primarily by Windows and browsers. It can contain multiple image sizes packed into a single file, allowing the OS or browser to pick the best size for the context — toolbar, taskbar, desktop shortcut, etc.

Which sizes should I include? +

16×16 and 32×32 are the most important for browser favicons and Windows taskbar icons. Add 48×48 for Windows Explorer. Include 64×128 for high-DPI displays and Windows desktop shortcuts.

What image should I start with? +

Use a square image with a clear, simple design that looks good even at 16×16 pixels. Logos with fine detail or small text will not be readable at small sizes. Keep it simple and bold.

Is ICO different from PNG favicon? +

Yes. ICO is a multi-resolution container format. A single favicon.ico can hold 16, 32, and 48px versions. Modern browsers also accept PNG favicons via <link>tags, but ICO is the traditional format and works everywhere including older browsers.

Are my images processed on a server? +

No. ICO generation happens entirely in your browser. The ICO file is built using JavaScript ArrayBuffers following the ICO file format specification. Nothing is uploaded.