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ROT13 Encoder Decoder

Encode and decode ROT13 text for simple letter substitution, puzzles, examples, lightweight obfuscation, and text transformation workflows.

ROT13 Output

Output will appear below

ROT13 converted text will appear here.

Rotating Letters With the ROT13 Cipher

ROT13 is a simple letter substitution method that shifts each alphabet letter by 13 places. Because the English alphabet has 26 letters, applying ROT13 a second time returns the original text.

This makes ROT13 useful for puzzles, examples, lightweight obfuscation, forum-style hidden text, and quick demonstrations of substitution ciphers. It is not encryption, but it is handy for simple text transformation.

How to Use the ROT13 Encoder Decoder

  1. Paste normal text or ROT13 text into the input box.
  2. Click Convert ROT13 to rotate all letters by 13 positions.
  3. Run the same action again on the output to recover the original text.
  4. Copy the result for examples, puzzles, notes, or text transformation workflows.

ROT13 Examples You Can Check Quickly

ROT13 changes letters while keeping numbers, spaces, punctuation, and symbols unchanged. Uppercase and lowercase letters keep their case style.

Hello → Uryyb

Yoryantra → Lbelnagen

API test 123 → NVC grfg 123

Where ROT13 Conversion Helps

  • Hiding simple spoilers or puzzle hints without strong security.
  • Demonstrating how substitution ciphers transform text.
  • Decoding ROT13 strings found in old examples, forums, or notes.
  • Creating quick encoded text samples for learning or documentation.

Reading ROT13 Output Correctly

  • Letters only: ROT13 changes A-Z and a-z letters.
  • Numbers stay the same: Digits are not rotated or modified.
  • Punctuation stays the same: Spaces, commas, periods, and symbols remain untouched.
  • Same action both ways: ROT13 is its own decoder, so converting twice restores the original text.

Frequently Asked Questions

What is ROT13?

ROT13 is a simple substitution cipher that replaces each letter with the letter 13 positions after it in the alphabet.

Is ROT13 encryption?

No. ROT13 is not secure encryption. It is a simple text transformation used for examples, puzzles, and light obfuscation.

Why does the same button encode and decode?

ROT13 shifts letters by 13 places. Since the alphabet has 26 letters, applying the same conversion twice returns the original text.

Does this upload my text?

No. ROT13 conversion happens directly in your browser.