🔍 ⌘K
↑↓ to navigate ↵ to select esc to close

ROT13 Decoder

Shift alphabet letters by 13 positions to obfuscate or reveal hidden text.

Hello World!

Fast Online ROT13 Cipher Tool

ROT13 ("rotate by 13 places") is a simple substitution cipher that replaces a letter with the 13th letter after it in the alphabet. Because the Latin alphabet has 26 letters, ROT13 is its own inverse—applying it twice returns the original text. It's a popular way to hide spoilers in online forums or obfuscate sensitive answers in puzzles.

How to Use ROT13

  1. Enter Your Text: Type or paste your message into the input field.
  2. Automatic Shift: The tool instantly applies the 13-position shift to every A-Z and a-z character.
  3. Read Output: The translated text is displayed immediately in the result box.

Key Features

  • Self-Inverse: You can use the same tool to both encrypt and decrypt your message.
  • Non-Alphabetic Preservation: Numbers, punctuation, and spaces remain unchanged, keeping your message's structure intact.
  • Instant Utility: No buttons required; see the results update as you type.

ROT13 FAQ

Is ROT13 secure?

No. ROT13 is not intended for serious security. It is merely a way to prevent accidental reading of text (like a movie spoiler) rather than protecting data from attackers.

What happens to the letter 'Z'?

The alphabet wraps around. 'Z' becomes 'M', and 'A' becomes 'N'.

Does it work with numbers?

Standard ROT13 only affects letters. If you want to rotate numbers, you would need a 'ROT5' or 'ROT18' cipher.

Explore More Text Transformers

You might also find these tools helpful for your workflow.

Reverse Text

Use this reverse text generator to flip your text character by character — great for puzzles or stylized messages.

Example: hello → olleh

Reverse Words

Reverse the order of words in your sentence without flipping the letters inside each word.

Example: I love text tools → tools text love I

Reverse Letters

Flip each word's letters individually while keeping the word order the same.

Example: hello world → olleh dlrow

Text Repeater

Repeat your text multiple times in one click. Perfect for testing, spamming, or meme effects.

Example: hello → hello hello hello

Replace Text

Find and replace specific words, characters, or phrases in your text using this fast text replacer.

Example: I like apples → I like oranges

Remove Duplicate Lines

Automatically delete repeated lines in a block of text. Great for cleaning up lists.

Example: apple apple banana → apple banana

Remove Line Breaks

Join all lines into a single line by removing line breaks. Ideal for JSON, code, or compact formatting.

Example: This is a test → This is a test

Add Line Breaks

Insert line breaks after a set number of words or characters. Useful for formatting paragraphs or captions.

Example: Add line breaks every 3 words → Add line breaks every 3 words

Remove Empty Lines

Strip out blank lines from any text block. Clean up messy spacing in seconds.

Example: Line 1 Line 2 → Line 1 Line 2

Remove Extra Spaces

Clean up extra spaces between words or after punctuation. Fix formatting with one click.

Example: Too many spaces → Too many spaces

Remove Whitespace

Remove all spaces, tabs, and line breaks to make your text completely compact.

Example: Compact me → Compactme

Sort Text Alphabetically

Sort lines of text in alphabetical order — A to Z or Z to A. Perfect for lists or tags.

Example: banana apple cherry → apple banana cherry

Sort Numbers

Sort numbers in ascending or descending order. Clean and organize numeric data easily.

Example: 9 5 3 → 3 5 9
ConverTXT - Convert Text – Uppercase to Lowercase & More | Copy & Paste | Product Hunt