ROT13 Converter

Encode and decode text with ROT13, which is a classic letter-shift cipher.

ROT13 Converter

This tool applies ROT13 to your text where each letter is moved 13 places forward in the alphabet.
Because a shift of 13 splits the alphabet in half, converting once encodes and converting again decodes.
So the same action goes both ways - Encoding and Decoding ROT13.
Input your text and the result appears in the "Output"

Load an example

Copy Download

Tip: ROT13 works both ways with the same action. Paste normal text to encode it, or paste ROT13 text to decode it back – because shifting by 13 twice returns the original (26 ÷ 2 = 13). For example, Hello ↔ Uryyb.

Ready to convert text with ROT13.

Overview

The ROT13 Converter applies the famous ROT13 letter shift to any text you enter. Every letter moves 13 places forward in the alphabet – A becomes N, B becomes O, and so on, wrapping around past Z. It is a specific case of the Caesar cipher and one of the simplest ways to hide text in plain sight.

Because the alphabet has exactly 26 letters and 13 is half of that, ROT13 is self-inverse: applying it twice always returns your original text. So this single tool encodes plain text into ROT13 and decodes ROT13 back into plain text with the very same action. Everything runs in your browser, so nothing you paste ever leaves your device.

How to Use

1. Enter your text: Type or paste it into the Input textarea, click "Load an example", or upload a plain .txt file.

2. Read your result: In Live mode the Output updates as you type; otherwise press "Apply ROT13" to convert manually.

3. Decode a message: Paste ROT13 text into the Input and it converts straight back to plain text – no separate mode needed.

4. Save it: Use the Copy or Download icons to keep the result.

Features

Self-inverse conversion (encode and decode at once): ROT13 shifts each letter by 13, which is exactly half of the 26-letter alphabet. Shift by 13 once and you have encoded text; shift that result by 13 again and you are back to the original. So the same button both encodes and decodes – there is nothing separate to switch.

Encode 
Hello
Apply ROT13 
Uryyb
Apply ROT13 again 
Hello

Paste Uryyb into the Input and the Output shows Hello – decoding is the same action. This is why the tool has no separate "Decrypt" mode.

Case preserved: Uppercase letters stay uppercase and lowercase letters stay lowercase, so the shape of your text is kept exactly.

Non-letters untouched: Spaces, digits, punctuation, and symbols pass through unchanged because ROT13 only shifts the letters A–Z.

Live mode: When on (the default), the Output updates as you type. Turn it off to convert only when you press the button.

Apply ROT13 / Clear: "Apply ROT13" runs the conversion manually; "Clear Everything" empties both textareas.

Copy / Download: Copy the result to your clipboard, or save it as a .txt file.

Examples

Press a "Try it" button to load that example into the Input – the Output converts it with ROT13 automatically. The first and second examples show how the same function both encodes and decodes.

Input (encode) 
Hello World
Output (ROT13) 
Uryyb Jbeyq
Input (decode) 
Uryyb Jbeyq
Output (ROT13) 
Hello World
Input 
The quick brown fox jumps over the lazy dog.
Output (ROT13) 
Gur dhvpx oebja sbk whzcf bire gur ynml qbt.
Input (decode) 
Gur dhvpx oebja sbk whzcf bire gur ynml qbt.
Output (ROT13) 
The quick brown fox jumps over the lazy dog.
Input 
ROT13 is a Caesar cipher with a shift of 13.
Output (ROT13) 
EBG13 vf n Pnrfne pvcure jvgu n fuvsg bs 13.
Input (decode) 
EBG13 vf n Pnrfne pvcure jvgu n fuvsg bs 13.
Output (ROT13) 
ROT13 is a Caesar cipher with a shift of 13.

FAQs

FAQ 1: What is ROT13?
Answer: ROT13 is a Caesar cipher with a fixed shift of 13. Each letter is moved 13 places forward in the alphabet, wrapping around past Z, so A becomes N, B becomes O, and so on.

FAQ 2: Can this tool convert ROT13 back to normal text?
Answer: Yes. ROT13 is self-inverse, so converting once encodes and converting the result again decodes it. Just paste your ROT13 text into the Input and the Output shows the plain text – no separate mode is needed.

FAQ 3: Is ROT13 secure encryption?
Answer: No. ROT13 is a form of obfuscation, not real encryption. Because it has only one possible shift, anyone can decode it instantly. Use it to hide spoilers, hints, or puzzle answers – not to protect sensitive data.

FAQ 4: How does the tool handle numbers and symbols?
Answer: Only the letters A–Z are shifted. Spaces, digits, punctuation, and other symbols are left exactly as they are, and the case of each letter is preserved.

FAQ 5: What is "Live mode"?
Answer: Live mode is on by default, so the Output updates automatically as you type or paste. Turn it off if you prefer to convert only when you press "Apply ROT13".

FAQ 6: Is my text private?
Answer: Yes. The tool runs entirely in your browser with JavaScript. Your text is never uploaded to or stored on our servers.

TextToolz

The Ultimate Text Tools

TextToolz works seamlessly to let you convert and design your text. It is fast, reliable and secure. Trusted by thousands of users.