•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.
File to Base64 Converter
Convert files to Base64 data URLs for embedding in HTML, CSS, or JSON
Image Upload
Input
Drag & drop your file here
or
Supported formats: All file types supported
Maximum file size: 10MB
Base64 Output
Output
What is File to Base64 Converter?
A File to Base64 converter allows you to encode files (JPG, PNG, GIF, WebP, SVG and more) into a Base64 data URL that can be embedded directly into HTML, CSS, or JSON. Base64 encoding transforms binary file data into text, enabling you to include files inline without needing to host the file separately. This is especially useful for embedding icons, small graphics, email templates, or generating portable JSON payloads. The output includes the correct MIME type (for example, data:image/png;base64,...) so you can paste it instantly into <img>, CSS background-image, or API requests.
How to Use
1
Upload a file using the file upload input
2
The tool will automatically convert your file into a Base64 data URL
3
Copy the Base64 output using the copy button
4
Paste the output into HTML, CSS, JSON, or wherever you need an inline file
5
Optional: Use the output as a data URL in an <img src='...'> tag or a CSS background property
Common Use Cases
Embed Files in HTML: Insert Base64 files directly into <img src='...'> without separate file hosting
Inline CSS Backgrounds: Use Base64 in CSS to embed backgrounds and icons
Email Templates: Embed files in HTML emails where external files may be blocked
API Payloads: Send files inside JSON payloads for upload systems or OCR services
Offline Apps & PWA: Embed assets directly for offline support
Reduce Requests for Icons: Inline small files to reduce HTTP requests and improve performance
Key Features
Supports Common Formats
Convert JPG, PNG, GIF, WebP, SVG and other files
Generates Data URLs
Output includes correct MIME type and Base64 prefix
Fast Local Conversion
Runs in your browser with instant output
One-Click Copy
Copy Base64 output to clipboard instantly
Privacy First
No server uploads — your images stay on your device
Optimized for Developers
Works perfectly for HTML, CSS, and JSON embedding workflows
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