ROT13 Cipher Tool
Encode and decode text using the classic ROT13 substitution cipher
Simple yet effective letter substitution cipher that rotates each letter 13 places. Perfect for basic text obfuscation, puzzle solving, and cryptographic fun.
ROT13 is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the alphabet.
ROT13 is its own inverse - applying ROT13 twice returns the original text.
A → N → A, B → O → B, etc.
Your encoded/decoded text will appear here
How to Use ROT13 Cipher
Simple steps to encode and decode text using ROT13 substitution
Enter Text
Type or paste the text you want to encode or decode
Choose Options
Select output format and any custom settings
Process Text
Click to apply ROT13 substitution to your text
Copy Result
Copy or download the encoded/decoded text
ROT13 Cipher Features
Advanced ROT13 encoding and decoding capabilities for every need
Standard ROT13
Classic 13-position letter rotation cipher for English alphabet
Custom Alphabet
Support for custom alphabets and character sets
Multiple Formats
Export as plain text, hexadecimal, or base64 encoding
File Processing
Process entire text files with ROT13 encoding/decoding
Real-time Processing
Instant encoding and decoding as you type
Batch Operations
Process multiple files simultaneously with efficient batching
Related Tools
Other text encoding and cryptographic tools you might find useful
Frequently Asked Questions
What is ROT13?
ROT13 is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the alphabet. It's a special case of the Caesar cipher.
Is ROT13 secure encryption?
No, ROT13 is not secure encryption. It's easily reversible and primarily used for hiding spoilers, jokes, or puzzle answers rather than actual security.
Does ROT13 work with numbers and symbols?
Standard ROT13 only affects letters (A-Z, a-z). Numbers and special characters remain unchanged, but the tool can handle custom alphabets.
Can I process large files with ROT13?
Yes, the tool supports batch processing of files. However, very large files may take longer to process.