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Convert to ICO.

Create custom favicons by converting your logos and icons to ICO format instantly. No server uploads. Private and secure.

Upload your images here

Drag and drop your files, or click to browse.
Supports PNG, JPG, WEBP, AVIF, GIF • Max. 50MB (GIF: 10MB)

Free & Unlimited
Fast Conversion
Multiple Files

Convert Image to ICO Online

Create your own icons and favicons by converting any image to the ICO format. Ideal for web developers and Windows customization.

When to Use ICO Format?

Create Your Favicon

Generate the favicon.ico file needed for your website to display your logo in the browser tab.

Windows Icons

Personalize your folders and files in Windows with your own converted images.

Multi-resolution

Our conversion ensures that the icon looks good at both 16x16 and 32x32 pixels.

Safe and Private

Convert your logos without them leaving your browser. No security risks.

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Frequently Asked Questions: ICO Format & Favicons

What is the ICO format and what is it used for? ▼
ICO is an image format used primarily for icons, such as website favicons or application icons.
Can an ICO file include multiple sizes? ▼
Yes, an ICO file can contain multiple resolutions in a single file to adapt to different screen sizes.
Does ICO support transparency? ▼
Yes, the ICO format supports transparency depending on the configuration and color depth used.
What is an ICO file used for on a website? ▼
ICO files are primarily used as favicons, the icon that appears in the browser tab and bookmarks.

The ICO Format and Digital Identity

The ICO format is an image file container capable of storing multiple sizes and color depths in a single file. It is the de-facto standard for favicons—the small icons that appear in browser tabs and bookmarks—ensuring your brand is instantly recognizable.

OptimizeImg allows you to generate optimized ICO files from any PNG or JPG entirely locally. Using our tool, the conversion engine processes pixels directly in your RAM, allowing you to create professional favicons with absolute transparency and sharpness, without compromising the privacy of your design assets.

Want to optimize your logo before converting?

A good favicon starts with a perfectly optimized source image. Reduce the size of your original PNG or JPG before generating the ICO file.

Optimize Originals Online

Prepare your files for the web.