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UUEncoder / Decoder

Encode and decode text using Unix-to-Unix (UU) encoding.

About UUencoding

UUencoding (Unix-to-Unix encoding) was the original mechanism for transferring binary files over early Unix mail and newsgroup systems. It maps every 3 bytes of input to 4 printable ASCII characters (characters 32–95) and wraps lines at 60 characters. The format begins with a begin 644 filename header (644 is the Unix file-permission octet) and ends with end.

For modern binary-to-text encoding, prefer Base64 or Base85.

Private & free — this tool runs entirely in your browser.

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