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Encode & Decode

ROT13 Encoder & Decoder

ROT13 shifts every letter thirteen places through the alphabet: A becomes N, B becomes O, and so on. Because the alphabet has twenty-six letters, applying it twice returns the original text — the same operation both encodes and decodes.

Free, no signupRuns entirely in your browser
Input
Result
Ivorynaq Pvcure Gbby
About

What the ROT13 Encoder & Decoder does

It was never meant as security. Its traditional use was on Usenet to hide spoilers and punchlines from casual view, so readers had to make a deliberate choice to reveal them. Treat it as a reversible obfuscation, nothing more.

How it works

Using the ROT13 Encoder & Decoder

  1. 1Paste your text.
  2. 2Each letter is rotated thirteen positions through the alphabet.
  3. 3Letters wrap around from Z back to A.
  4. 4Case is preserved, and digits, punctuation and spaces are left untouched.
  5. 5Run the output through again to get back the original.
Use cases

What people use it for

  • Hiding a spoiler or puzzle answer from casual reading
  • Obscuring a punchline in a forum post
  • Teaching how substitution ciphers work
  • Solving a puzzle that uses ROT13
FAQ

Frequently asked questions

6 related

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