UUencode Encode & Decode
A classic Unix encoding for sending binary over text (begin/end). This tool does both encode and decode on one page — just pick a mode, paste your text, and click. Everything runs on your device, nothing is sent to a server.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
Cat
Example Output
begin 644 file #0V%0 ` end
How to Use
- 1Choose Encode or Decode mode at the top.
- 2Type or paste your text into the Input field.
- 3Click the button (or press Ctrl+Enter) to process. The result appears in the Output field.
- 4Click Copy to copy the result, or "Swap input/output" to quickly reverse the operation.
About UUencode
UUencode (Unix-to-Unix encoding) is an old format for sending binary files over text-only media, like email and Usenet, before Base64/MIME became standard.
How it works: every 3 bytes are converted into 4 printable ASCII characters, with each line prefixed by a length character. Blocks are wrapped in "begin"/"end" lines. The result can be decoded back to the original data.
UUencode is rarely used now but still appears in old archives and some legacy systems. This tool helps you encode or decode UUencode content.
FAQ
Can this UUencode tool both encode and decode?
Yes. This is a single page with a toggle — use Encode mode to transform text, and Decode mode to reverse it. No need for two separate pages.
Is my data sent to a server?
No. UUencode is processed entirely in your browser. The text you enter never leaves your device.