About Caesar Cipher & ROT13 Encoder / Decoder
Encrypt and decrypt messages using the classical Caesar shift cipher. Features customizable shift keys from 1 to 25, 1-click ROT13 preset, case and punctuation preservation, and an interactive A-Z alphabet mapping table.
Key Capabilities & Features
- Two-way Encrypt and Decrypt modes
- Customizable shift key from 1 to 25
- 1-Click ROT13 preset (shift = 13)
- Preserves casing and punctuation
- Interactive visual alphabet shift mapping chart
How to Use Caesar Cipher & ROT13 Encoder / Decoder
1
Choose Mode
Select Encrypt (shift forward) or Decrypt (shift backward).
2
Adjust Shift
Set shift key number or click ROT13.
3
Copy Result
Copy your transformed message.
Privacy & In-Browser Execution Guarantee
Encryption and decryption run locally in your browser.
Frequently Asked Questions
Why is ROT13 special in cryptography?
Because the Latin alphabet has 26 letters, shifting by 13 is symmetric: applying ROT13 twice restores the original text.
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