Uuencode

Encodes and decodes text using classic POSIX uuencode format. The encoder splits the UTF-8 bytes into 45-byte chunks, packs every three bytes into four 6-bit values offset by ASCII 32 (with 0 mapped to backtick), and wraps the output with a "begin 644 <filename>" header and an "end" footer. The decoder reverses the process back to UTF-8 text.

1. Optionally set the Filename field (defaults to file.txt); it appears in the begin header. 2. Type or paste your text into the input area. 3. Click Encode (down arrow) to produce uuencoded output, or Decode (up arrow) when the input is already uuencoded. 4. Use the Copy button to copy the output and Clear to reset. Any error (missing begin/end, invalid character, non-UTF-8 bytes) is shown in a red banner.

Each line begins with a length byte equal to (chunk length + 32), except that a zero-length count is encoded as the backtick character (code 96). Each triplet of bytes becomes four 6-bit groups; each group is emitted as character (value + 32), with value 0 rendered as backtick to avoid embedded spaces. The final chunk is zero-padded so the encoder always emits complete 4-character groups, then trims unused output characters based on the actual byte count. Decoding requires the begin and end markers and stops each line after the declared byte count.