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OnlyCompress
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Compress ICO Icons

Supports compressing up to 30 ICO icon files at the same time, quickly reducing file size while maintaining icon quality as much as possible. Files are not uploaded to the network — all processing is completed on your device. All features are free to use.

Select ICO Files

Drag and drop ICO icons here, or use Paste (Ctrl + V / ⌘ + V) to import quickly.

💡 Please use a system browser

ICO Compression Guide

  1. Why compress ICO icons?

    ICO files are commonly used for website favicons and application icons. They may contain multiple icon sizes, which can increase file size. Compressing ICO files can reduce storage usage, improve loading, sharing, and transfer speeds, while maintaining the icon appearance as much as possible.

  2. How to compress ICO icons?
    • Click the Select ICO Files button, or directly drag and drop icons onto the page.
    • Click the Compress button, and the system will automatically optimize ICO icons to reduce file size.
    • Click the compressed ICO file to preview it, and adjust the file size using optimization options.
    • Click Save to download a single file, or click Save All to save all compressed ICO icons.
  3. When should you compress ICO icons?
    • Website favicon

      ICO is a common website icon format. Compression can reduce the file size when browsers load icons.

    • Application icons

      Windows applications often use ICO files as icons. Optimization can reduce storage usage.

    • Icon sharing

      Compressing ICO files before sharing can reduce transfer size and improve sending efficiency.

    • Icon management

      Batch compressing ICO files can help organize files and save storage space.

    • Website optimization

      Optimizing ICO icons used on websites can help reduce resource loading time.

  4. Privacy & Security
    • 100% Local Processing — Icons never leave your device, and all compression is completed securely in your browser.
    • No File Uploads — Files are not processed by servers, and your ICO files always remain under your control.
    • Privacy First — We do not view, store, or collect any of your image data.
    • No Registration Required — Open and use instantly to complete compression quickly.
    • Original Files Stay Safe — Compressed files are generated as new files, and your original ICO icons are never modified.