ToolsBear ToolsBear

ICO Compressor

Compress ICO favicon images.

Select or drag & drop ICO images

ICO only • Up to 50MB each

Compress ICO to a Specific Size

Need to hit an exact portal limit? Choose your target size:

5KB10KB15KB20KB25KB30KB40KB50KB100KB150KB200KB300KB500KB1000KB2MB

Key Features

Compress ICO (.ico) images without visible quality loss

Reduce ico file size up to 80% with the HTML5 Canvas compressor

100% browser-based — ICO files never leave your device

Compress favicon and ICO icon files for websites

Batch compress multiple ICO images and download as ZIP

Free, no sign-up, no watermarks, no file size limits

How to Compress a ICO Image Online

Step-by-step guide to reduce ICO file size using ToolsBear free browser-based compressor.

1

Upload your ICO image

Click Select or drag & drop and choose your ICO file.

2

Choose compression mode

Use the Quality slider for general compression, or enter a Target Size in KB for an exact file size.

3

Select output format (optional)

Optionally convert to JPEG, PNG, or WebP while compressing.

4

Compress and download

Click COMPRESS. Download the individual file or all files as a ZIP.

Frequently Asked Questions

How does the ICO compressor work?
All compression runs in your browser using the HTML5 Canvas API. Your ICO file is re-encoded at an optimised quality level — nothing is uploaded to a server.
Will my ICO image lose quality?
Some re-compression happens, but the default quality setting keeps the image visually identical for web, email and portal use. You can adjust the slider for more or less compression.
Is this ICO compressor free?
Yes. It is completely free to use online. No registration, no watermarks, and no file size limits.
Can I compress ICO images to an exact KB target?
Yes. Enter a target KB value and the binary-search algorithm will find the exact quality setting to hit it.

Related Tools

Compress Image

Reduce file size of JPG, PNG, SVG, GIFs while maintaining quality.

JPG/JPEG Compressor

Compress JPG and JPEG images without losing quality.

PNG Compressor

Compress PNG images with transparency support.

WebP Compressor

Compress WebP images for faster web loading.

GIF Compressor

Reduce GIF file size while preserving animation.

BMP Compressor

Compress BMP bitmap images efficiently.