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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 16x16, 32x32 and 48x48 pixels.

Universal Compatibility

Generates ICO icons recognized by Chrome, Firefox, Safari, Edge, and Windows systems to ensure your icon works in any environment without compatibility issues.

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Frequently Asked Questions: ICO Format & Favicons

Which is better for web, ICO or PNG? ▼
For modern favicons, both are valid. However, the ICO format remains preferable for maximum compatibility with older browsers and operating systems, as it allows including multiple sizes in a single container file.
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. The system or browser automatically selects the most appropriate version depending on the use. With our tool you can manually select which resolutions to include (such as 16x16, 32x32, or 48x48) before converting.
Does ICO support transparency? ▼
Yes, the ICO format supports transparency through an alpha channel, allowing you to create icons with soft edges and transparent backgrounds.
What is an ICO file used for on a website? ▼
On websites, the ICO file is used as a favicon, the small icon that appears in the browser tab, bookmarks, and shortcuts.
Can I convert an ICO file back to PNG? ▼
Of course! If you need to recover the original image or use it in another format, you can use our ICO to PNG converter for free.

What is the ICO Format and How Does it Work?

The ICO format is an image container designed to store multiple sizes and color depths within a single file. This allows the system or browser to automatically select the most appropriate resolution based on the context of use.

It is the standard for web favicons and also for icons in Windows systems. An ICO file can include resolutions such as 16×16, 32×32, 48×48, 64×64, 128×128, and 256×256 pixels, ensuring a sharp display in browser tabs as well as shortcuts or desktop.

Internally, each size is stored as an independent image (usually in BMP or compressed PNG format), allowing traditional compatibility to be combined with modern optimization. This makes the ICO format flexible, lightweight, and widely supported by browsers and operating systems.

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 Images Online

Prepare your files for the web.