ICO to Base64 Converter
Convert ICO favicon files to Base64 encoded strings for embedding directly in HTML, CSS, or JavaScript. Perfect for single-file applications and inline favicon embedding.
Drop your ICO image here
or click to browse files
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Complete Guide: ICO to Base64 Converter
Everything you need to know about using this tool effectively
The ICO to Base64 Converter transforms ICO icon files into Base64 encoded data URLs. The tool reads your ICO file, encodes the binary data into a text string you can paste directly into code. This is useful for embedding favicons in HTML or CSS without separate file references. The tool processes everything in the browser, so your image never leaves your device.
This tool reads your ICO file, converts the icon data into a Base64 string, and generates a ready-to-use data URL. ICO files are small by nature, so the encoded output stays manageable for inline use in web pages.
Inline favicons in HTML
Embed favicon ICO files directly in HTML link tags using data URLs, removing the need for a separate favicon file.
Single-file applications
Bundle ICO icons directly into HTML or JavaScript files to create self-contained applications with no external assets.
CSS background icons
Use Base64 encoded ICO data in CSS url() properties for icon backgrounds without additional HTTP requests.
Configuration and databases
Store ICO icon data as text strings in configuration files or databases that only accept text input.
Upload an image
Drag and drop or click to browse for your ICO file.
Convert
Click Convert. The tool encodes the icon into a Base64 string.
Copy or download
Copy the data URL or download it as a text file.
ICO files are typically small, so the Base64 output stays compact enough for inline use.
Base64 encoding increases data size by about 33 percent.
Modern browsers support data URL favicons, but some older browsers may not.
Use the data URL in a <link rel="icon"> tag with the correct MIME type.
Will the image quality change?
No. Base64 encoding is a lossless text representation of the binary data. The decoded image is identical to the original ICO.
Is my image uploaded to a server?
No. All processing happens in your browser using JavaScript. The image never leaves your device.
What is the maximum file size?
The tool supports images up to 50MB. ICO files are typically very small, well under this limit.
Can I use the data URL as a favicon?
Yes. Paste the output into an HTML link tag as the href value. Use type="image/x-icon" for the MIME type.
Can I convert multiple images at once?
Yes. Upload multiple ICO files and the tool generates a Base64 string for each one.