ICO Converter - Create Favicon from Any Image Free

What Is an ICO File?

An ICO file is a graphics file format designed specifically for icons. It is most commonly used as a favicon for websites and as an application icon on Windows operating systems. Unlike standard image formats like JPG or PNG that hold a single image, an ICO file can store multiple images at different sizes and color depths within a single file. This allows browsers and operating systems to automatically select the best resolution for the display context, whether it is a tiny 16x16 browser tab icon or a large 256x256 desktop shortcut icon.

The ICO format has been part of the Windows ecosystem since Windows 1.0 and remains the standard for favicons on the web. When you visit any modern website, the small icon that appears in your browser tab is almost always an ICO file served from the site's root directory as favicon.ico.

Why Favicons Matter for Branding

A favicon is one of the smallest yet most impactful branding elements on your website. It appears in several high-visibility locations:

• Browser tabs — When a user has multiple tabs open, your favicon is the only visual identifier that distinguishes your site from others.
• Bookmarks and favorites — Saved bookmarks display the favicon next to the page title, making your site recognizable at a glance.
• Browser history — When users search their browsing history, the favicon helps them quickly locate your website.
• New tab pages — Many browsers display frequently visited sites with their favicons on the new tab page.
• Mobile home screens — On smartphones, the favicon can serve as the icon when a user adds your website to their home screen.

A missing or generic favicon makes a website look incomplete and unprofessional. Taking a few seconds to generate and install a custom favicon from your logo or brand mark instantly elevates your site's appearance and reinforces brand recognition across every touchpoint.

Recommended ICO Sizes for Different Use Cases

Different contexts call for different favicon sizes. Here is a practical guide:

• 16x16 pixels — The classic browser tab icon. Used by older browsers and in bookmark lists.
• 24x24 pixels — Used by Windows desktop shortcuts and some context menus.
• 32x32 pixels — The most widely used favicon size. Recommended as the default for most websites.
• 48x48 pixels — Used by Windows tiles and some high-DPI displays.
• 64x64 pixels — Suitable for high-resolution displays and Windows 10 tiles.
• 96x96 pixels — Used by some TV and large-screen interfaces.
• 128x128 pixels — Used by Chrome Web Store and high-DPI displays.
• 192x192 pixels — Used by Android devices as the home screen icon.
• 256x256 pixels — The largest standard size, used for Windows desktop icons and high-resolution displays.

If you are unsure which size to use, select "All sizes" in the tool. This generates a multi-size ICO file containing 16, 32, 48, 64, 128, and 256 pixel variants, covering all common use cases in a single file.

The "All Sizes" Multi-Size ICO Feature

The "All sizes" option is the most versatile choice for most users. Instead of generating a single-size ICO, it creates a file containing six standard sizes: 16, 32, 48, 64, 128, and 256 pixels. The browser or operating system automatically picks the appropriate size based on the display context.

This approach has several advantages:

• One file, all contexts — A single favicon.ico file works for browser tabs, bookmarks, Windows tiles, Android home screens, and high-DPI displays.
• Future-proof — As new devices and browsers adopt different display sizes, your ICO already contains variants to handle them.
• No guesswork — You do not need to know which size each browser or device prefers. The ICO file provides them all.
• Smaller total file size — A multi-size ICO is typically smaller than serving separate icon files for each size because the ICO format shares color data between variants.

How to Use Your Generated Favicon in HTML

After downloading the ICO file, follow these steps to install it on your website:

1. Upload to your root directory — Place the favicon.ico file in your website's root directory (the same folder that contains your index.html or index.php).
2. Add the HTML link tag — Inside the <head> section of your HTML files, add: <link rel="icon" href="/favicon.ico" type="image/x-icon">
3. Test across browsers — Open your website in Chrome, Firefox, Safari, and Edge to verify the favicon appears correctly in each browser's tab.

Most browsers automatically check the root directory for favicon.ico even without the HTML tag, but adding the tag explicitly is best practice and ensures consistent behavior across all browsers.

If your website uses a subdirectory structure or you want to use a different filename, the href attribute in the link tag should point to the correct relative or absolute path.

How ICO Conversion Works

This tool uses PHP's GD library to perform the image conversion. The process is straightforward:

• Source image loading — The tool reads your uploaded image (JPG, PNG, BMP, or WebP) and creates an GD image resource.
• Resizing — The image is resized to the target ICO dimension(s) using GD's resampling algorithm, which preserves sharpness better than basic resizing.
• Alpha channel preservation — If your source image has transparency (such as a PNG with a transparent background), the alpha channel is preserved throughout the conversion process, resulting in clean transparent edges in the final ICO.
• ICO file assembly — For multi-size ICOs, all size variants are packed into a single ICO file following the ICO format specification.

The entire conversion happens server-side in memory. No temporary files are stored, and your source image is discarded immediately after conversion.

Supported Input Formats

The ICO Converter accepts the following image formats as input:

• JPG / JPEG — The most common photographic image format. Ideal when converting logos or photographs that do not require transparency.
• PNG — Supports alpha transparency, making it the best choice for logos, icons, and any image where transparent edges are needed.
• BMP — A lossless format often used in Windows applications. Supported for maximum compatibility.
• WebP — A modern format with excellent compression. Fully supported for conversion to ICO.

For the sharpest favicon results, use a PNG source image with a transparent background at a resolution of 256x256 pixels or larger.

When to Use a Single Size vs "All Sizes"

Choose a single size when you know exactly which context your favicon will be used in and you want to keep the file size minimal. For example, if you only need a browser tab icon, a 16x16 or 32x32 ICO is sufficient.

Choose "All sizes" when you want comprehensive coverage. This is the recommended option for most websites because it ensures your favicon looks crisp on every device and in every context without requiring you to generate multiple files separately.

Related Tools

• JPG to PNG — Convert JPG images to PNG format with transparent background support.
• Image Resizer — Resize images to any dimension while maintaining quality.

Privacy and Security

Image conversion is performed entirely on our servers using PHP's GD library. Your uploaded images are processed in memory and discarded immediately after the ICO file is generated. We do not store, cache, or share your images. No cookies, tracking scripts, or analytics collect your uploaded files.