ICO to Base64 Converter

Convert ICO to Base64 free - every size inside the icon becomes a copy-ready PNG data URI you can paste straight into HTML, CSS, or code. Ideal for inline favicons, email signatures, and single-file web pages. Upload up to 20 ICO files or paste a favicon URL. Need image files instead? Use the ICO to PNG converter, wrap icons as markup with ICO to SVG, or inspect them first with the Icon Analyzer.

Drop your .ico files here, or click to select them manually!

Up to 20 ICO files, max 5MB each.

Convert from URL

Download all files as an archive:

or download them individually:

Your Base64 data URIs will appear here,

once you convert them.



Popular Tools: ICO to PNG ICO to SVG Image to ICO Icon Analyzer PNG to ICO

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Convert ICO from URL

Enter the URL of the ICO file you want to convert to Base64:

How to Convert ICO Files to Base64

  1. From computer: Drag and drop your ICO file onto the converter or click to browse and select it manually.
  2. Convert from URL: Click the "Convert from URL" link, paste the direct URL to an ICO file (like a favicon), and click Convert.
  3. Download: Once converted, copy or download a data URI for each icon size contained in the ICO.
Need sample files to test? Browse the ICO sample files.

Why Convert ICO to Base64?

A Base64 data URI embeds your icon directly in text, so it can live inline in HTML, CSS, or code without a separate file. Converting ICO to Base64 lets you:

  • Embed favicons inline with zero extra HTTP requests - ideal for single-file pages, tools, and dashboards.
  • Use icons in email signatures and environments where hosting a separate image file is not possible.
  • Copy each icon size to the clipboard with one click, ready to paste into your project.
  • Keep transparency - the data URI wraps a lossless PNG of your icon.
For inline favicons, paste the 32x32 data URI into <link rel="icon" href="data:image/png;base64,...">. Need regular image files instead? Use the ICO to PNG converter, or ICO to SVG for markup-based icons.

FAQ - ICO to Base64 Converter

Is this ICO to Base64 converter free to use?

Yes! This ICO to Base64 converter is completely free with no hidden charges, watermarks, or subscription fees. Convert as many files as you need without any cost.

What is a Base64 data URI?

A data URI embeds the image bytes directly in text (data:image/png;base64,...), so the icon can live inline in HTML, CSS, or code without a separate file or extra HTTP request.

How do I use the Base64 favicon in my HTML?

Paste the data URI into a link tag, for example: <link rel="icon" href="data:image/png;base64,..."> in your page head. It works in all modern browsers.

Why is the Base64 text larger than the original file?

Base64 encoding adds roughly 33% overhead compared to the binary file. That is the tradeoff for being able to embed the image directly in text.

Will I get a data URI for every size in the ICO?

Yes! ICO files typically contain multiple sizes (16x16, 32x32, 48x48, 256x256, etc.). The converter creates a separate copy-ready data URI for each size - for favicons, the 32x32 version is usually the best choice.

Can I convert a website favicon to Base64?

Absolutely! Use the "Convert from URL" feature to paste any favicon URL (usually at domain.com/favicon.ico) and get copy-ready data URIs for every size.

Icon Conversion Stats

Recently Converted Icons
96 Live trend (15m)
360 Icons Last hour
10am (447) Peak hour
64.6M Total Icons converted

Analyze Your Icons with the Icon Analyzer

Before converting, check what's inside your ICO files. Our Icon Analyzer reveals all embedded sizes, color depths, and transparency information to help you understand exactly what you're working with.