Caesar Cipher / ROT13
Caesar Cipher shifts each letter by a chosen amount to encode or decode text. Set the shift to 13 for classic ROT13.
🔒 Runs locally. Note: the Caesar cipher is for fun/puzzles, not real security.
How to use Caesar Cipher / ROT13
- Type your text.
- Choose a shift amount (13 = ROT13).
- Copy the encoded or decoded result.
Frequently asked questions
What is ROT13?
A Caesar cipher with a shift of 13 — applying it twice returns the original text.
Does it keep punctuation?
Yes, only letters are shifted; numbers and symbols are left unchanged.
Is it secure encryption?
No — the Caesar cipher is a simple, easily-broken cipher meant for fun and puzzles, not real security.
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