Batch Image to ICO Converter

Pure Local Processing No Server Upload 7 Output Formats Canvas API

Output Format

PNG Lossless, supports transparency JPEG Small file, best for photos WebP Modern web format AVIF Next-gen compression BMP Uncompressed bitmap TIFF Professional print/archive ICO Icon format for Windows

ICO Mode

Icon Pack

Generates 16×16 to 256×256 multi-size icons

As-Is

Converts at original resolution, single-image ICO

100% Free & Private batch image to ICO converter. No file upload required — convert HEIC, PNG, JPG, WebP, AVIF, BMP, TIFF to ICO locally in your browser. Automatically generates multi-resolution icons (16×16 to 256×256) for website favicons and desktop apps. Supports batch ZIP download.

Tips & Tricks

Windows Icon Format

ICO is the native icon format for Windows. It can contain multiple sizes (16x16 to 256x256) and color depths in a single file, adapting automatically to different display contexts.

When to Use ICO

Choose ICO for Windows application icons, favicons for websites (with proper HTML tags), and any context where a multi-resolution icon is needed.

ICO Best Practices

Include sizes 16x16, 32x32, 48x48, and 256x256 for best compatibility. For website favicons, use the 32x32 size as a minimum. Start with a PNG source for best quality.

Common Use Cases

Favicon Creation

Create browser tab icons for your website

Windows App Icons

Design application icons for Windows desktop software

Desktop Shortcuts

Generate custom icons for desktop shortcuts and folders

Multi-Resolution Packaging

Bundle multiple icon sizes in a single .ico file

Brand Identity

Maintain consistent branding across Windows UI elements

Legacy Systems

Support older Windows versions requiring .ico format

Frequently Asked Questions

Are my images uploaded to a server?

No. All processing runs entirely in your browser via the Canvas API. Your images never leave your device.

What is an ICO file?

ICO is the native icon format for Windows. It is a container format that can hold multiple image sizes and color depths in a single file. ICO files are used for application icons, shortcuts, and website favicons.

Is there a file size limit?

Yes, each file must be under 50 MB. You can upload up to 20 files at once. If you need to convert more, process them in batches.

How do I use the ICO as a website favicon?

Use Icon Pack mode to generate a multi-size ICO file, then add to your HTML . Include a 32×32 PNG as a fallback for modern browsers via .

Can I convert multiple images at once?

Yes. Upload up to 20 images at once. After conversion, you can download each file individually or package them all as a ZIP archive for convenience.

Why does the Icon Pack mode generate multiple sizes?

Windows uses different icon sizes in different contexts: 16×16 for title bars, 32×32 for shortcuts, 48×48 for folders, and 256×256 for high-DPI displays. A properly formatted ICO with all these sizes ensures your icon looks crisp everywhere.