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Text to ROT13

Apply the ROT13 letter rotation to hide a spoiler.

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At 13, the same rotation both encodes and decodes.

Quick Tool Overview

Text to ROT13 rotates each letter thirteen places through the alphabet, the Usenet convention for hiding a spoiler so it cannot be read by accident. ROT5 can rotate the digits too, and the rotation amount is adjustable for Caesar cipher work.

What it does
Applies a ROT13 or Caesar rotation to text
You give it
A spoiler, puzzle answer or message
You get back
The rotated text, unreadable at a glance
Best for
Hiding spoilers and answers on forums
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About the Text to ROT13

ROT13 replaces each letter with the one thirteen places further along the alphabet, so A becomes N and N becomes A. Because thirteen is exactly half of twenty-six, applying it twice returns the original text — the same operation both encodes and decodes.

It is not encryption and was never meant to be. Its purpose is to make text unreadable at a glance so that a spoiler, a puzzle answer or an offensive joke is not accidentally read by someone who did not want to see it. That convention dates to Usenet in the early 1980s and is still used on forums today. Digits can be rotated too with ROT5, and the rotation amount is adjustable for anyone working through a Caesar cipher exercise.

Key features of the Text to ROT13

Self-inverse at 13

The same tool encodes and decodes, because rotating thirteen twice returns the original.

ROT5 for digits

Numbers survive ROT13 unchanged, so a date or a score would still give the answer away.

Any rotation

One to twenty-five, which turns it into a general Caesar cipher tool.

Punctuation preserved

Spacing and punctuation pass through, so the shape of the text is unchanged.

Honest about security

The page states plainly that ROT13 is not encryption and was never intended to be.

How to use the Text to ROT13

  1. 1

    Type your text

    The spoiler, answer or joke you want hidden.

  2. 2

    Leave the rotation at 13

    ROT13 is the convention, and it means the same tool decodes it again.

  3. 3

    Add ROT5 for digits if you need it

    Numbers are not rotated by ROT13 alone, so a date or a score would still be readable.

  4. 4

    Copy the rotated text

    Post it where a reader can decode it deliberately rather than accidentally.

Frequently asked questions

Not at all, and it is not meant to be. It takes seconds to break by hand and no time at all by machine. Its job is to prevent accidental reading, not deliberate reading.

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