Convert PNG to ICO instantly

Convert PNG images to ICO favicon files in your browser. Creates multi-size icons for websites. No upload, no server. Free and instant.

Drop your PNG file here

or click to browse

Your files stay private
No server upload
Instant conversion

Example

Input (PNG)

[logo.png]
A 512x512 square logo with transparency
File size: 28 KB

Output (ICO)

[logo.ico]
Multi-size ICO with 16x16, 32x32, and 48x48 icons
File size: 12 KB

About this converter

Every website needs a favicon, and favicons use the ICO format. This converter takes your PNG image, scales it to three standard favicon sizes (16x16, 32x32, and 48x48), and packs all three into a single ICO file. The ICO is built by embedding the resized PNG data directly into the ICO container format. No external libraries, no server. The entire process runs in your browser using the Canvas API for resizing and manual binary construction for the ICO wrapper.

PNG vs ICO

Portable Network Graphics (PNG)

PNG (Portable Network Graphics) is a lossless image format that supports transparency, making it ideal for graphics, icons, and screenshots.

Common uses: screenshots, graphics with transparency, and lossless images

W3C PNG specification

Windows Icon Format (ICO)

ICO is Microsoft's icon format used for favicons in web browsers and application icons in Windows. An ICO file can contain multiple image sizes (16x16, 32x32, 48x48, 256x256) in a single file.

Common uses: website favicons, Windows application icons, and desktop shortcuts

How to convert PNG to ICO

  1. 1

    Upload

    Upload your PNG file using the drop zone above, or click to browse your device.

  2. 2

    Convert

    Click the "Convert to ICO" button. The conversion runs instantly in your browser.

  3. 3

    Download

    Download your converted ICO file. No data was sent to any server.

Frequently Asked Questions

Last updated: 2026-03-23