ROT13 Encoder and Decoder
What is ROT13 Encoder and Decoder
ROT13 (rotate by 13) is a simple letter cipher that shifts every letter 13 places through the alphabet, so A becomes N and N becomes A. Because 13 is half of 26, applying it twice returns the original text, which means the same tool both encodes and decodes. Digits, spaces, and punctuation are left unchanged. It runs entirely in your browser.
How to use
- Type or paste your text.
- Read the ROT13 result, updated as you type.
- Paste ROT13 text to decode it: the same rotation reverses it.
- Copy the result or share the link with your text filled in.
When to use it
Want to hide a spoiler, a puzzle answer, or a punchline in plain sight? Run it through ROT13 and only someone who decodes it will read it. It is a classic on forums and in CTF challenges, and since ROT13 is its own inverse, you paste scrambled text into the same box to get it back. For a shift you can pick, use the Caesar cipher tool.
Frequently asked questions
How do I decode ROT13?
Paste the ROT13 text into the box. ROT13 is its own inverse, so encoding and decoding are the same operation. The result is the original text.
Does ROT13 change numbers or symbols?
No. Only the 26 letters are rotated, and case is preserved. Digits, spaces, accents, and punctuation pass through unchanged.
Is ROT13 secure?
No. It provides no real security, only light obfuscation to keep text from being read at a glance. For actual encryption, use the AES text encryption tool.
Can I share this with my text pre-filled?
Yes. The URL updates automatically as you type. Copy it from the address bar or use the Copy link button, and anyone who opens it sees your exact text ready to go.
Related tools
AES Text Decryption
Decrypt AES-256 encrypted text with your password in your browser. Free, private, and fully offline. No data leaves your device.
AES Text Encryption
Encrypt text with a password using AES-256 in your browser. Free, private, and fully offline. Nothing is sent to a server.
Atbash Cipher Encoder and Decoder
Encode and decode the Atbash cipher online. Atbash mirrors the alphabet and is its own inverse, so one click scrambles and unscrambles. Free and private.