base64 2025-01-19
Understanding Base64 Encoding and Decoding
A comprehensive guide to Base64 encoding, its uses, and how it works.
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format.
Why Base64?
Base64 encoding is essential when you need to:
- Transmit binary data over text-based protocols
- Embed images in HTML or CSS
- Store binary data in JSON or XML
- Send attachments in emails
How Base64 Works
Base64 converts binary data into a set of 64 printable ASCII characters:
- A-Z (26 characters)
- a-z (26 characters)
- 0-9 (10 characters)
- + and / (2 characters)
- = for padding
Encoding Process
1. Take the binary data
2. Split into 6-bit groups
3. Map each group to a Base64 character
4. Add padding if necessary
Common Use Cases
Data URLs: Embed small images directly in HTML
API Authentication: Basic authentication headers use Base64
Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ=
Important Notes
- Base64 is NOT encryption - it's just encoding
- Encoded data is about 33% larger than original
- URL-safe Base64 uses - and _ instead of + and /
Use our Base64 tool to easily encode and decode your data.