ICO Generator
Create multi-size .ico icon files from any image. Free, runs in browser, no signup.
How to use ICO Generator
Using ICO Generator is quick and simple. Upload your file using the upload zone above — drag and drop it directly or click to browse your files. The tool works entirely in your browser, so your files never leave your device and nothing is uploaded to any server. Once you have your file loaded, adjust the settings to your preference and click the process button. Your result will be ready to download in seconds. All processing happens client-side using modern browser APIs, ensuring complete privacy and fast performance even for large files.
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.
Your files never leave your device. All processing happens in your browser. No data is sent to any server.