Base64 Encoder & Decoder — Fast & Secure Online Tool
Base64 is a binary-to-text encoding scheme that represents binary data in ASCII string format. It's commonly used for encoding data in URLs, emails, and data URIs. All encoding and decoding happens locally in your browser for complete privacy.
Features
- Text and file encoding/decoding
- Drag & drop file support
- URL-safe Base64 encoding
- Real-time live mode
- Multi-line processing
- Client-side processing - your data never leaves your browser
Common Use Cases
Development
- API Authentication (Basic Auth)
- JWT Token Decoding
- Data URIs for Images
- Email Attachments
Data Transfer
- Binary Data in JSON
- URL Parameter Encoding
- Cookie Values
- XML Binary Data
Useful Resources
Base64 - Wikipedia Introduction to Base64 encoding concept and history
RFC 4648: The Base16, Base32, and Base64 Data Encodings Official IETF specification defining Base64 encoding standard
MDN Base64 Encoding Guide Comprehensive guide to Base64 encoding in web development
MDN btoa() Function JavaScript function for encoding strings to Base64
MDN atob() Function JavaScript function for decoding Base64 to strings