Base64 to text decoding is the process of converting Base64 encoded strings back to their original plain text format. Base64 encoding uses 64 ASCII characters (A-Z, a-z, 0-9, +, /) to represent binary data, making it safe for transmission through text-based systems like email, JSON APIs, and HTTP headers.

When you decode Base64 to text, you're reversing the encoding process that converted the original text into a Base64 string. This is commonly needed when receiving data from REST APIs, reading email attachments, or debugging web applications that use Base64 encoding for data transmission.

Our Base64 to text decoder follows RFC 4648 standards and automatically handles UTF-8 encoding, ensuring that international characters, emojis, and special symbols are correctly decoded. The implementation uses modern web security best practices for safe client-side processing.

Base64 decoding converts groups of four Base64 characters back into three bytes of binary data. The decoding algorithm maps each character to its 6-bit value, then combines these values to reconstruct the original bytes.

The process handles padding characters (=) that were added during encoding to ensure the output length was a multiple of 4. Each Base64 character represents 6 bits of data, so 4 characters encode 24 bits (3 bytes) of original data. This reverse transformation is defined in the MIME Content-Transfer-Encoding specification.