ROT13 / Caesar Cipher
Encode or decode text with ROT13 or any Caesar shift.
Input
Shifted output
Apply the same shift again to decode
About the ROT13 / Caesar Cipher
Shift letters by any amount to encode or decode text using the classic Caesar cipher, including the popular ROT13 preset used for spoiler text and simple obfuscation.
Examples
ROT13
HelloOutput
UryybKeyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
Related tools
AES Encrypt/Decrypt
Encoders & Crypto
Encrypt or decrypt text with AES-GCM and a passphrase.
Base32 Encoder
Encoders & Crypto
Encode or decode text using RFC 4648 Base32.
Base64 Encoder
Encoders & Crypto
Encode or decode text to/from Base64, UTF-8 safe.
Basic Auth Header Generator
Encoders & Crypto
Build or decode an HTTP Basic Authorization header.
Bcrypt Hash Generator
Encoders & Crypto
Generate and verify bcrypt password hashes with adjustable cost.
Checksum Comparator
Encoders & Crypto
Hash text or a file and compare against an expected checksum.
Frequently asked questions
Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser