ROT13 & Caesar Cipher
Encode or decode text using standard ROT13 rotation cipher or custom Caesar cipher shift values from 1 to 25. 100% client-side cipher.
How to Use ROT13 & Caesar Cipher
- Input Text: Paste or type the text you want to encode or decode.
- Select Cipher: Choose standard ROT13 (13-position rotation) or specify a custom Caesar shift (1-25).
- Copy Cipher Text: The rotated text is computed instantly in your browser.
Key Features & Capabilities
- Standard ROT13: Classic symmetric Caesar rotation where applying the cipher twice restores the original text.
- Adjustable Shift Value: Slide or enter any shift offset between 1 and 25 for custom Caesar ciphers.
- Case & Symbol Preservation: Preserves uppercase/lowercase casing, numbers, punctuation, and emojis.
- 100% In-Browser Privacy: Your text never leaves your device or touches an external server.
Common Use Cases
- Spoiler Obfuscation: Hide movie spoilers, puzzle answers, or hints on online forums and game boards.
- Cryptography Education: Explore and demonstrate classic substitution ciphers in classrooms and workshops.
Frequently Asked Questions
- Why does applying ROT13 twice decode the text?
- Because the Latin alphabet has 26 letters, rotating by 13 twice rotates by 26, returning to the starting letter.
- Does ROT13 change numbers or symbols?
- No, only alphabetical letters (A-Z and a-z) are rotated; numbers and punctuation remain unchanged.
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