Caesar Cipher & ROT13
TextEncrypt or decrypt text with the Caesar cipher free online. Pick a shift from 1 to 25, choose a direction, or jump instantly to ROT13 in your browser.
Result
Only A–Z and a–z letters are shifted; Turkish letters, numbers, punctuation and symbols are preserved as-is.
What is the Caesar cipher?
A substitution cipher where each letter of the alphabet is replaced by the letter a fixed number of positions later. With a shift of 3, A becomes D, B becomes E and so on; it is one of the oldest known encryption techniques.
How do I use it?
- Choose Encrypt or Decrypt to set the direction of the transformation.
- Drag the shift slider from 1 to 25 to pick how far letters move.
- Hit ROT13 to jump straight to shift 13, where encrypting and decrypting are the same operation.
FAQ
- Which characters are changed? Only A–Z and a–z are shifted; numbers, accents, Turkish letters and symbols stay untouched.
- Is ROT13 secure? No, it is not a form of real encryption — like all Caesar shifts it is trivially breakable.
- Where is the work done? Entirely in your browser; your text is never uploaded.
Frequently Asked Questions
What is Caesar Cipher & ROT13?
Encrypts or decrypts text with a Caesar shift from 1 to 25, plus one-click ROT13.
How do I use Caesar Cipher & ROT13?
Type or paste your data into the field on this page and press the button. The result is calculated instantly in your browser — nothing is uploaded.
Is Caesar Cipher & ROT13 free?
Yes, Caesar Cipher & ROT13 is completely free. No signup, no downloads and no usage limits.
Similar tools
View all toolsPopular tools
View all toolsWant to share what you created? Try linklyhub.com for a short, clean link.