Icon Resizer

Icon Resizer

Resize ICO files, extract or add icon sizes, and create multi-size icons for websites, apps, and desktop shortcuts.

Drop your ICO or PNG here

or click to browse files

Supports ICO and PNG files up to 5MB
Related Icon Tools:
PNG to ICO ICO to PNG Favicon Generator ICO Analyzer

How It Works

  1. Upload your ICO or PNG file using drag & drop or the file browser.
  2. If it's an ICO file, select which existing sizes you want to keep.
  3. Choose additional standard sizes or add custom dimensions.
  4. Select your preferred output format (single ICO, PNGs, or individual ICOs).
  5. Click "Resize Icon" and download your resized icon file.

Icon Size Guide

16×16, 32×32

Standard favicon sizes for web browsers. Essential for website identity.

48×48, 64×64

Desktop icon sizes for Windows/Mac. Used in file explorers and taskbars.

128×128, 256×256

High-resolution icons for modern displays, app stores, and Retina screens.

Common Icon Use Cases

Website Favicons

Display your brand in browser tabs, bookmarks, and history. Include 16×16, 32×32, and 48×48 for optimal coverage across all browsers.

Desktop Applications

Windows applications require icons at multiple sizes for taskbar, Start menu, and desktop shortcuts. Include 16×16 through 256×256 for best results.

Mobile Home Screen

iOS and Android devices use specific icon sizes for home screen shortcuts. Apple Touch icons use 180×180, while Android prefers 192×192.

File Type Associations

Custom file extensions can use ICO files to display unique icons in Windows Explorer, helping users identify your application's files instantly.

About ICO Files

The ICO file format is a container format developed by Microsoft for storing icons in Windows. Unlike standard image formats, a single ICO file can contain multiple images at different sizes and color depths, making it ideal for icons that need to display correctly at various resolutions.

Each image within an ICO file is stored as either a BMP (bitmap) or PNG compressed image. Modern ICO files typically use PNG compression for larger sizes (48×48 and above) to reduce file size while maintaining quality, and BMP for smaller sizes to ensure maximum compatibility.

When Windows or a web browser needs to display an icon, it automatically selects the most appropriate size from the ICO file. This ensures your icons look crisp and professional whether displayed as a tiny favicon in a browser tab or a large desktop shortcut.

Pro tip: Want to examine what's inside your ICO file? Use our ICO Analyzer to see all embedded sizes, color depths, and compression types.

Frequently Asked Questions

Upload your ICO file, select which existing sizes to keep, choose additional standard or custom sizes, then click 'Resize Icon'. Download your new resized ICO file containing all selected sizes.

Yes! Upload a PNG image and select the sizes you want to include. The tool will create a multi-size ICO file with all your selected dimensions, perfect for favicons and application icons.

For a website favicon, include at least 16×16, 32×32, and 48×48 pixel sizes. For modern devices, also consider 180×180 (Apple Touch) and 192×192 (Android).

Yes, our Icon Resizer fully preserves transparency in both PNG and ICO files. Transparent areas in your original image remain transparent across all sizes.