Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to plain text instantly. Free online Base64 converter with file support and batch processing. No registration required.
About Base64 Encoding
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It's commonly used to encode data that needs to be stored or transmitted over media designed to handle textual data.
Common Use Cases
- Email Attachments: MIME uses Base64 to encode binary attachments
- Data URLs: Embedding images and files directly in HTML/CSS
- API Authentication: Basic authentication headers use Base64
- Configuration Files: Storing binary data in text-based config files
- Web Development: Encoding data for safe transmission over HTTP
How Base64 Works
Base64 encoding takes binary data and converts it into a text representation using 64 different ASCII characters (A-Z, a-z, 0-9, +, /). Every 3 bytes of input data produces 4 characters of Base64 output, resulting in approximately 33% size increase.
Key Features
- Bidirectional: Easily encode to Base64 and decode back to original text
- Safe Transport: Ensures data integrity during transmission
- Universal Support: Supported by all modern programming languages
- Text-Safe: Contains only printable ASCII characters
Important Notes
- Base64 is encoding, not encryption - it provides no security
- Encoded data is approximately 33% larger than the original
- Padding characters (=) may be added to ensure proper length
- Line breaks and whitespace are typically ignored during decoding
Privacy Notice
All encoding and decoding is performed locally in your browser. No data is transmitted to our servers, ensuring complete privacy and security.