Base64 Encoder/Decoder
Encode and decode Base64 strings instantly.
快速测试
Other Utilities
What is Base64?
Base64 is an encoding scheme that converts binary data into ASCII text format. It uses 64 characters (A-Z, a-z, 0-9, +, /) to represent data, making it safe to transmit through text-based systems like email or URLs.
How Base64 Works
Base64 encoding takes 3 bytes (24 bits) of binary data and converts them into 4 ASCII characters. Each character represents 6 bits of the original data. If the input isn't divisible by 3 bytes, padding (=) is added.
Common Uses of Base64
- Email attachments: MIME encoding for binary files
- Data URIs: Embedding images directly in HTML/CSS
- API data: Transmitting binary data in JSON
- Basic authentication: HTTP authorization headers
- Cookies: Storing complex data in browser cookies
Base64 Encoding Example
| Original Text | Base64 Encoded |
|---|---|
| Hello | SGVsbG8= |
| World | V29ybGQ= |
| Base64 | QmFzZTY0 |
Important Notes
- Not encryption: Base64 is encoding, not security. Anyone can decode it.
- Size increase: Base64 output is about 33% larger than the input
- UTF-8 support: This tool properly handles Unicode characters
