ICO Converter — Favicon Generator
Convert a PNG or JPG image into a multi-size favicon ICO file. Generates 16, 32, 48, and 64px sizes in one download. Free, instant, browser-only.
About ICO Converter — Favicon Generator
Create a complete favicon from any PNG or JPG image in seconds, entirely inside your browser. Upload your image and the tool generates a single `.ico` file containing four sizes — 16×16, 32×32, 48×48, and 64×64 pixels — which covers every browser and platform that displays favicons. The ICO file is assembled manually using the ICO binary format directly in JavaScript. Each size is rendered by drawing the source image onto a Canvas element at the target dimensions, using the browser's built-in image resampling for the best possible quality. The four canvases are then packed into a single binary file and downloaded as `favicon.ico`. A preview grid shows all four scaled thumbnails before you download so you can check how your image looks at small sizes. Sharp, simple images with high contrast tend to work best as favicons; detailed photographs usually become unrecognisable at 16×16 pixels. Once downloaded, place the `favicon.ico` file in the root of your website. Most browsers will pick it up automatically when they see `<link rel="icon" href="/favicon.ico">` in the HTML head.
Frequently Asked Questions
- What sizes does the ICO file contain?
- The downloaded ICO file contains four sizes: 16×16, 32×32, 48×48, and 64×64 pixels. This covers browser tab icons, Windows taskbar icons, and bookmarks across all major platforms.
- What image formats can I upload?
- PNG and JPG are supported. PNG is recommended if your image has transparency, since the ICO file preserves the alpha channel.
- Does this tool send my image to a server?
- No. The entire process runs in your browser. Your image is never uploaded or transmitted anywhere.
- How do I add the favicon to my website?
- Place the downloaded favicon.ico in the root of your website (alongside your index.html). Add <link rel="icon" href="/favicon.ico"> inside the <head> of your HTML.