Developer Tools
Encode plain text with the ROT13 substitution cipher instantly.
Use this ROT13 encoder to shift each Latin letter by 13 positions and produce ROT13-encoded text instantly. It is useful for puzzles, CTF basics, simple obfuscation demos, classroom examples, and understanding classical substitution ciphers. Paste text into the tool and get the transformed output directly in the browser.
Use this ROT13 encoder to shift each Latin letter by 13 positions and produce ROT13-encoded text instantly. It is useful for puzzles, CTF basics, simple obfuscation demos, classroom examples, and understanding classical substitution ciphers. Paste text into the tool and get the transformed output directly in the browser.
Use rot13 encode when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.
Read step-by-step usage guidance, best practices, and common mistakes.
See common questions and answers about input, output, and tool usage.
Review practical input and output examples before running the tool.
Find similar and supporting tools for adjacent actions and follow-up tasks.
Input
hello
Output
uryyb
Shows the basic ROT13 shift on lowercase Latin letters.
Input
Attack at dawn
Output
Nggnpx ng qnja
Useful for seeing how spaces stay unchanged while letters rotate.
Fix: Remember that ROT13 is only a simple substitution cipher, not real encryption.
Fix: ROT13 only affects A-Z and a-z letters.
Fix: Use ROT13 Decode, even though ROT13 is symmetrical.
Fix: Only letters change. Spaces, punctuation, and digits stay the same.
Fix: Use a real encryption tool like AES for actual secrecy.
It rotates each Latin letter by 13 positions.
No. It is a simple substitution cipher and is not secure.
No. It changes only A-Z and a-z letters.
Yes. ROT13 is fully reversible.
The reverse tool is ROT13 Decode.