Base64 Encoder/Decoder
Convert text and data to Base64 encoding and back. Essential for web development, APIs, data URIs, and authentication tokens. Instant, accurate, and free.
Base64 Encoder/Decoder
What is Base64?
Base64 is an encoding scheme that converts binary data into ASCII text format using 64 characters (A-Z, a-z, 0-9, +, /). It is used to safely transmit binary data over text-based protocols like email, JSON, or URLs.
Common Use Cases
Example
Original: Hello World!
Base64: SGVsbG8gV29ybGQh
Frequently Asked Questions
Is Base64 encryption?
No! Base64 is encoding, not encryption. It is easily reversible and provides no security. Do not use it to hide sensitive data — use proper encryption instead.
Why does Base64 increase file size?
Base64 increases size by ~33% because it represents 3 bytes of binary data using 4 ASCII characters. This overhead is the cost of text-safe transmission.
What are the = signs at the end?
The = signs are padding to make the output length a multiple of 4. They are required by the Base64 specification and indicate how many bytes the original data had.