•8 min read
Base64 Encoding and Decoding: Complete Developer Guide
Master Base64 encoding and decoding with practical examples. Learn when to use it, common pitfalls, and best practices for handling binary data.
JavaScript to Base64 Converter
Convert JavaScript files to Base64 data URLs for embedding in HTML and web apps
JavaScript Upload
Input
Drag & drop your file here
or
Supported formats: JavaScript files
Maximum file size: 10MB
Base64 Data URL
Output
What is JavaScript to Base64 Converter?
Convert JavaScript files to Base64 data URLs for embedding directly in HTML or web applications. This is useful for creating self-contained HTML documents, bookmarklets, or single-file web apps where you want to inline all scripts. The tool generates a data URL with the data:text/javascript;base64,... prefix that can be used in <script> tags.
How to Use
1
Upload a JavaScript (.js or .mjs) file
2
The tool automatically converts it to Base64
3
Copy the Base64 data URL output
4
Use it in HTML: <script src='data:text/javascript;base64,...'></script>
5
Or decode and inline the JavaScript in <script> tags
Common Use Cases
Create self-contained HTML documents with embedded scripts
Build single-file web applications
Create bookmarklets with complex JavaScript
Package web components with inline scripts
Share HTML prototypes without external JS files
Store JavaScript in JSON configuration files
Key Features
Supports .js and .mjs file extensions
Generates valid data
text/javascript;base64,... URLs
Fast browser-based conversion (no upload required)
One-click copy to clipboard
Perfect for self-contained HTML documents
Privacy-first
files stay on your device
Related Articles
Learn more about this tool with our in-depth guides