ConvertDuck

PNG to ICO Converter

Convert PNG images into multi-resolution Windows Icons (.ico).

Generate Professional Windows Icons Instantly

Creating functional icons for Windows applications requires more than just a file extension change. Our tool uses the browser's Canvas API to bundle multiple resolutions into a single .ico file, ensuring your software looks sharp on taskbars and desktops alike. In our experience, including a 256px layer is vital for high-DPI displays.

How to Create Your Custom Icon

1. Upload PNG

Drag your source image into the dropzone. We recommend starting with a square 512x512 PNG for the best results.

Transparent backgrounds are fully preserved in the final ICO output.

2. Select Resolutions

Choose which sizes to bundle. Standard Windows icons usually require 16px, 32px, 48px, and 256px.

Avoid 512px unless you specifically need large previews, as it triples the file size.

3. Download ICO

Click 'Generate' to compile the layers. The conversion happens on your CPU, so it's nearly instant.

Test your new icon by applying it to a desktop shortcut.

Built for Developers and Designers

  • ✓ Multi-Layer Bundling

    Unlike basic converters, this tool allows you to pack up to 9 different resolutions into one single file for maximum compatibility.

  • ✓ Client-Side Processing

    We value your privacy. Your images are never sent to a server; all pixel manipulation occurs locally in your browser.

  • ✓ High-Quality Resampling

    Using high-quality image smoothing, we ensure that even the smallest 16x16 icons remain legible and clear.

Compatibility & Specs

Input Format PNG (Portable Network Graphics) with Alpha channel support.
Output Format Windows Icon Resource (.ico) containing multiple PNG sub-images.
Browser Support Chrome 90+, Edge 91+, Firefox 88+, Safari 14+.

Browser Conversion vs. Server Uploads

Feature PngToIco (Local) Online Uploaders
Privacy 100% Secure (Local) Files stored on servers
Speed Instant Slow upload/download
File Limit Up to 50MB Often limited to 5MB

Common Questions

Q. Why do I need multiple resolutions in one ICO? ▼
Windows uses different sizes depending on the view (List, Small Icons, Large Icons). Providing all sizes prevents blurry scaling.
Q. Will my icon have a transparent background? ▼
Yes, as long as your source PNG has transparency, the resulting ICO will maintain it perfectly.
Q. Can I use this for Favicons? ▼
While it works, modern websites usually prefer a single 32x32 .ico or a direct .png link.