ICO Generator
Turn any image into a multi-size Windows .ico file.
How to use
- 1 Drop in a square image to use as the icon.
- 2 Tick the resolutions you want bundled (16 to 256 px).
- 3 Click Download .ico to build the multi-size icon.
- 4 Save it as favicon.ico or attach it to your app.
About ICO Generator
The ICO Generator turns an ordinary image into a proper Windows .ico file — the icon format used for favicons, desktop shortcuts and application icons.
Unlike a plain PNG, a real .ico can hold several resolutions inside a single file, so the operating system or browser can pick the crispest version for each context.
This tool builds exactly that, entirely inside your browser.
Drop in a square image (it works with any picture, but square art gives the sharpest result) and choose which sizes to include: 16, 32, 48, 64, 128 and 256 pixels are offered, matching the conventional icon set Windows and browsers expect.
Each selected size is rendered to its own canvas, encoded as a PNG, and then packed into a standards-compliant multi-image ICO container — the same PNG-in-ICO approach modern systems read natively.
The result is one .ico you can drop into a website root as favicon.ico or attach to a desktop application.
Because the rendering and the binary packing both happen locally with the Canvas API, your source image is never uploaded or stored anywhere, and the generator keeps working offline once loaded.
Pick your sizes, click download, and you have a ready-to-ship icon in seconds.
FAQ
Is my image uploaded to make the icon?
No. Each size is rendered and the .ico binary is assembled in your browser, so the source image never leaves your device.
Why include multiple sizes in one file?
An .ico can store several resolutions so the OS or browser shows a sharp icon whether it needs a tiny 16px favicon or a large 256px tile.
Does my image need to be square?
It is strongly recommended. Non-square images are squished to fit each square icon size, so a square source looks best.