Base64 is a group of binary-to-text encoding schemes that represent binary data in an ASCII string format. But why is this necessary? The internet's fundamental protocols (like HTTP and SMTP) were originally designed to handle text, not raw binary bytes.
How Base64 Works
Base64 takes three bytes of binary data (24 bits) and divides them into four 6-bit chunks. Each 6-bit chunk maps to a printable character in the Base64 alphabet (A-Z, a-z, 0-9, +, /). This guarantees that the encoded string will survive transport through text-only systems without corruption.
Common Use Cases
- Data URIs: Embedding small images directly into CSS or HTML files to save HTTP requests. You can generate these using our Image to Base64 Converter.
- API Payloads: Sending binary files (like PDFs) inside a JSON payload requires encoding.
- Basic Auth: HTTP Basic Authentication encodes the username and password in Base64.
Encoding vs. Encryption
It is a critical security principle that encoding is not encryption. Base64 obfuscates data from human eyes, but any machine can decode it instantly. Never use Base64 to secure passwords. If you need to quickly encode or decode strings, try our standard Base64 Text Tool.