UUencode & XXencode
Run UUencode and XXencode both ways.
📧UUencode & XXencode
All processing happens locallyWhat this tool does
UUencode & XXencode is a codec for legacy mail attachments, processing runs locally in your browser, so your input never reaches a server.
Results update as you change values; copy or download when ready.
How to use it
- Paste or type your content into the input field at the top, or press the sample button to load demo data.
- Adjust the options below the input, such as output format, separators, letter case or precision.
- Press the main button to run the conversion. Results appear instantly in the output panel without a page reload.
- When the result looks right, use the copy button in the corner, or download it as a local file.
Tips and notes
Clean up stray spaces and line breaks before pasting for more accurate results.
FAQ
Rarely. Modern mail uses Base64, but legacy systems, embedded devices and old archives still produce UUencode or XXencode, which this tool restores.
The structure is identical; only the alphabet differs. UUencode adds a 32 offset per value, while XXencode maps to a custom 64-character set with fewer ambiguous glyphs.
Yes. The tool is completely free with no usage limits, and you never need an account or a sign-in.
No. All processing runs locally in your browser, so the input never reaches a server and is never logged or stored.
Yes. The layout is mobile-first, so inputs and buttons stay comfortable on phones and tablets in both orientations.
Yes. A copy button in the output panel puts the result on your clipboard, and you can also download it as a text file.