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.
RFC 4648 Client-Side Only
Related tools
- URL Encoder URL encoder and decoder for query parameters and components. Parse protocol, host, path. Support for encodeURI and encodeURIComponent methods
- HTML Entity Encoder Encode and decode HTML entities. Convert special characters to HTML entity codes and vice versa with support for named and numeric entity references.
- JWT Decoder Decode and analyze JSON Web Tokens (JWT) with detailed header, payload, and signature inspection. Validates JWT structure and provides Base64 decoding insights.
- Punycode Converter Convert international domain names to Punycode and back. IDN converter supporting Unicode domains for DNS compatibility, also several domains at once, line by line.
Features
- Text and file encoding/decoding
- Drag & drop file support
- URL-safe Base64 encoding
- Real-time live mode
- 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