Convert an image to ICO
Drop a JPG, PNG, WebP, or GIF, tick which sizes to embed, and download a multi-resolution .ico ready to drop in your project. Transparency is preserved, and the conversion runs entirely in your browser. The image never leaves your device.
About ICO files
An ICO file is a container that can hold the same picture at several sizes in a single file. Browsers and operating systems then pick the most appropriate one automatically: 16×16 for browser tabs, 32×32 for taskbars and bookmarks, and larger sizes up to 256×256 for desktop and application icons. This tool renders each size you tick from the original image and stores it as a PNG payload embedded directly in the ICO container. This is the approach standardised since Windows Vista and accepted by every modern browser, and the only way the format carries a 256×256 entry. The default selection (16 + 32 + 48) covers the most common website use; presets and individual checkboxes let you add the larger sizes when you need them.
Is it private?
Yes. The converter is browser APIs running on your own machine. Nothing is uploaded, stored, or seen by us. There is no server to send files to.
Frequently asked questions
- What image formats can I convert to ICO?
- You can drop a JPG, PNG, WebP, or GIF image and convert it to a .ico file ready to use as a favicon or application icon. A square source works best; a non-square image is fit into each icon and centred on a transparent background so it keeps its proportions.
- Which sizes does the ICO file contain?
- You choose. Tick the sizes you want from 16×16 up to 256×256, or use a preset: Favicon (16, 32, 48), Desktop, or all sizes. Each chosen size is rendered separately and stored as a PNG payload inside the single .ico file, and the panel shows which sizes will be embedded before you convert.
- Is transparency preserved?
- Yes. Every embedded size is written as 32-bit RGBA, so a transparent PNG, WebP, or GIF keeps its alpha channel in the resulting icon.
- Are my images uploaded to a server?
- No. The converter is browser APIs running on your own machine. Nothing is uploaded, stored, or seen by us, and there is no server to send files to.
- Is it free, and do I need an account?
- It is free with no watermarks, no daily caps, and no sign-up. Drop a file, choose your sizes, and download the result.