Base64 Encoder Decoder - Encode & Decode Base64

This bidirectional converter transforms binary data to printable ASCII text using Base64 encoding scheme defined in RFC 4648, enabling safe transmission of binary content through text-only channels like email or JSON. The encoder processes input byte sequences in 24-bit groups (three bytes), converting each group into four 6-bit values that map to a 64-character alphabet comprising uppercase letters A-Z, lowercase a-z, digits 0-9, plus (+), and slash (/) symbols.

Encoding mechanics partition input into three-byte blocks, creating four Base64 characters per block through bit shifting and masking operations. When input length isn't divisible by three, padding characters (=) appear at output end to signal incomplete final groups - one pad indicates two final input bytes, two pads indicate one final byte. Decoding reverses this process, interpreting four-character blocks back into three original bytes by mapping each Base64 character to its 6-bit value then concatenating bits into proper byte boundaries.

The tool supports multiple input types including plain text (converting via UTF-8 encoding), file uploads for binary data like images or PDFs, and hexadecimal strings for low-level data manipulation. Output displays in copyable text areas with automatic line wrapping at 76 characters per RFC 2045 MIME standards when requested. Common applications include embedding image data directly in HTML/CSS through data URLs, encoding authentication credentials in HTTP headers, storing binary configuration in text-based formats like JSON or XML, or obfuscating text from casual observation without cryptographic security.