Uuencoding (Unix-to-Unix encoding) is a binary-to-text encoding that was used to transmit binary files over UUCP and early email systems in the 1980s and 1990s. It has been largely superseded by Base64 MIME encoding.

How does Uuencoding work?

Uuencoding groups input bytes into 3-byte groups and encodes each as 4 printable characters in the range ASCII 32–95. Each line starts with a length character and is 60 encoded characters long.

Uuencoder / Uudecoder — Free Online Tool

How to Use uuencode

Paste or enter your input into the text field.
Configure any options (format, delimiter, encoding, or mode) using the controls above the output.
The result updates instantly — no submit button required for most operations.
Click Copy or Download to take the output to your next step.

Encode text with Unix-to-Unix encoding and decode Uuencoded data. Free to use with no sign-up — the tool operates entirely in your browser, nothing sent anywhere.

How uuencode Works

uuencode is a browser-side encoding utility built for speed and simplicity. Paste your input and the result appears within milliseconds. The tool handles edge cases — empty inputs, special characters, large datasets — without crashing or producing silent incorrect output. If you need a related operation, check the Related Tools section below.

Accepts large inputs — no size limits imposed by this tool
Handles edge cases: empty fields, special characters, and Unicode
Copy-to-clipboard and file download for every output
Works on Chrome, Firefox, Safari, and Edge without any extensions

Frequently Asked Questions

What does uuencode do?

uuencode encode text with unix-to-unix encoding and decode uuencoded data. Results appear immediately — no page reloads, no waiting for a server response.

What input does uuencode accept?

Paste text directly into the input field, or type your data. Most operations handle Unicode, special characters, and multi-line inputs without issue.

How large an input can I process?

There is no hard limit imposed by this tool. Very large inputs (multi-MB text) process within your browser's available memory. For files larger than 50 MB, a command-line tool may be faster.

Can I download the output?

Yes — every output panel includes a Copy to Clipboard button and a Download as file option. Outputs are saved as plain text or the appropriate file format for the operation.

Explore the full suite of Encoding tools and 290+ other free utilities at Chunky Munster.

Uuencoder / Uudecoder online

Encode text with Unix-to-Unix encoding and decode Uuencoded data — runs in your browser