How to Convert Images to ICO for Perfect Favicons (2025 Guide)

It’s the smallest element on your website, yet it might be the most viewed. The favicon (short for “favorite icon”) is that tiny image displayed in the browser tab, bookmarks bar, and history list.

While modern browsers support PNG and SVG icons, the classic .ICO format remains the gold standard for compatibility. Why? Because unlike a standard image, an .ico file is a container that can hold multiple versions of your icon at different sizes.

In this guide, we’ll explain why you need a multi-size ICO file and how to create one for free using our privacy-first converter.

Why Do I Need an .ICO File?

You might be asking: “Can’t I just use a PNG?”

You can, but the .ico format has a unique superpower: backward compatibility and multi-resolution support.

When you save a website as a desktop shortcut on Windows, or when a user views your site on an old legacy browser, a standard PNG might render poorly or not appear at all.

An .ico file can contain:

16x16 pixels: For browser tabs.
32x32 pixels: For taskbar shortcuts and high-DPI screens.
48x48 pixels: For desktop icons.

When you provide a single .ico file containing all these sizes, the operating system or browser automatically picks the best one. If you only provide a 32px PNG, the browser has to resize it down to 16px for the tab, which often results in a blurry, pixelated mess.

Step-by-Step: Converting Image to ICO

Creating a professional favicon doesn’t require expensive software like Photoshop. You can do it right here in your browser.

1. Prepare Your Source Image

Start with a high-quality image.

Format: PNG is best because it supports transparency. JPG works, but you’ll have a solid background box around your icon.
Shape: Use a perfect square (1:1 ratio).
Size: We recommend at least 512x512 pixels. This ensures that when we scale it down, the edges remain crisp.

2. Upload to the Converter

Go to our Free Image to ICO Converter.

Drag and drop your logo file into the upload box.
You will immediately see a preview of your file.

3. Select Your Target Sizes

This is the most important step. In the tool settings, you will see checkboxes for different sizes (16, 32, 48, 64, 128, 256).

We recommend selecting at least:

✅ 16px: Essential for tabs.
✅ 32px: Essential for Retina displays.
✅ 48px: Good for Windows desktop icons.

Our tool will generate all of these images and pack them into a single file.

4. Convert and Download

Click the “Convert to ICO” button. The process happens locally in your browser (so your logo is never uploaded to our server).

Once finished, click “Download .ICO File”. You will get one file, usually named favicon.ico.

Note: Don’t be confused if you only download one file! Remember, .ico is a container. All your selected sizes are inside it.

How to Install the Favicon on Your Website

Once you have your favicon.ico, installing it is simple.

Step 1: Upload the file

Upload the file to the root directory of your website (e.g., public_html/ or www/). Ideally, it should be accessible at https://yoursite.com/favicon.ico.

Step 2: Add the code

Add the following code to the <head> section of your HTML pages.

<head>
  <!-- Standard ICO for legacy browsers and general use -->
  <link rel="icon" href="/favicon.ico" sizes="any" />

  <!-- Optional: SVG for modern browsers (if you have one) -->
  <link rel="icon" href="/icon.svg" type="image/svg+xml" />

  <!-- Optional: Apple Touch Icon (PNG, usually 180x180) -->
  <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
</head>

Best Practices for 2025

Keep it Simple

At 16x16 pixels, detail is your enemy. If your logo has text or complex shapes, they will become unreadable dots.

Do: Use a simplified symbol or the first letter of your brand.
Don’t: Try to squeeze your full company name into the icon.

Use Transparency

A square box around your logo looks unprofessional, especially on browser tabs with dark mode enabled. Always use a PNG with a transparent background as your source file.

Check Contrast

Remember that users have different browser themes (Light Mode vs. Dark Mode). A black logo might disappear on a dark browser tab.

Tip: Add a subtle white outline or glow to dark logos so they stand out against dark backgrounds.

Summary

A crisp favicon is a sign of a polished, professional website. By using our Image to ICO Converter, you can ensure your brand looks sharp on every screen, from an old Windows desktop to the newest MacBook Retina display.

Ready to upgrade your site’s look? Create your favicon now.