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
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What is ICO to Base64 Converter?
ICO to Base64 Converter encodes icon files as text-based data URLs. ICO stores favicon and Windows icon image data, while Base64 represents the binary file as a string that can be embedded in code. The tool reads the ICO in the browser and produces a copyable data URL for HTML, CSS, or JavaScript.
How does ICO to Base64 Converter work?
This tool reads the ICO file bytes and encodes them with Base64. It also prefixes the encoded string with an ICO data URL MIME type when needed. Base64 encoding is lossless, but it increases text size by roughly one third compared with the original binary icon.
Key Features
- Converts ICO files to Base64 data URLs
- Generates ready-to-paste HTML and CSS strings
- Uses browser FileReader encoding for local processing
- Shows original file size and encoded length
- Copy Base64 string with one click
- Supports drag-and-drop file selection
- Supports images up to 50MB
- Supports batch conversion for multiple ICO files
Common Use Cases
Inline favicons in HTML
Embed favicon ICO files directly in HTML link tags with data URLs instead of separate file references.
Single-file applications
Bundle ICO icons into HTML or JavaScript files for demos, prototypes, and portable documents.
CSS background icons
Use Base64-encoded ICO data in CSS url() values for small icon backgrounds.
Configuration and databases
Store ICO icon data as text in configuration files, JSON payloads, or databases that only accept strings.
How to Use This Tool
Upload an image
Drag and drop an ICO file or select one from your device.
Convert
Click Convert. The tool reads the ICO bytes and creates a Base64 data URL.
Copy or download
Copy the data URL or download it as a text file.
Pro Tips
- 1
Use ICO to Base64 converter output for small favicons and icons, not large image assets.
- 2
Base64 encoding increases size by about one third, so external files are better for larger icons.
- 3
Use the data URL in a link rel="icon" tag when embedding a favicon inline.
- 4
Keep a normal ICO file for production if browser caching and separate asset delivery matter.
Frequently Asked Questions
What does ICO to Base64 converter do?
ICO to Base64 converter reads an ICO file and outputs a Base64 data URL that can be pasted into HTML, CSS, or JavaScript.
Is my ICO uploaded to a server?
No. The ICO file is read and encoded in the browser.
What is the maximum file size?
The tool supports files up to 50MB, although ICO files are usually much smaller.
Can I use the data URL as a favicon?
Yes. Paste the output into an HTML link tag as the href value and use type="image/x-icon" when needed.
When should I convert ICO to Base64?
Convert ICO to Base64 when a favicon or small icon must be embedded inline in code or stored as text.