An ICO file is a container that holds one or more small images at different sizes and color depths. It is widely used for favicons (the small icons displayed in browser tabs, bookmarks, and shortcuts). By converting your PNG into a multi‑resolution ICO, you ensure that your icon looks sharp on all devices and contexts.

Modern favicons work best with multiple sizes: 16×16, 32×32, and 48×48 cover most desktop browsers. For high‑DPI displays (like Retina) and mobile bookmarks, include 64×64, 128×128, or even 256×256. This tool lets you bundle all of them into a single .ico file.

Yes! Although the tool is called “PNG to ICO Converter”, you can upload JPG, JPEG, and WebP images as well. The converter will automatically process them into high‑quality PNG data embedded inside the ICO file.

Absolutely. This is a client‑side tool. Your image never leaves your browser — it’s processed locally using HTML5 Canvas and JavaScript. No uploads to any server, which guarantees privacy and speed.

Yes. The interface is fully responsive and works in modern mobile browsers. You can pick an image from your photo library, select sizes, and download the .ico file directly to your phone.

Favicons must be square. This tool automatically crops your image to a centered square region (using the shortest side) before resizing. This prevents stretching and keeps the icon visually appealing. For best results, upload a square PNG image.