What is a Caesar cipher?

A substitution cipher that shifts every letter by a fixed number of positions in the alphabet, wrapping from Z back to A.

How do I decode a message?

Switch Direction to Decode and enter the same shift amount that was used to encode it.

Yes — letter case is preserved, and non-letter characters (spaces, punctuation, digits) pass through unchanged.

Shift every letter by a fixed amount to encode or decode text — a classic substitution cipher, computed instantly in your browser.

Processed locally in your browser — nothing is sent to a server.

Direction

Shift

Input

1 lines13 charsValid

Output

Khoor, Zruog!

1 lines13 charsValid

Enter a shift amount and encode text by shifting every letter forward through the alphabet, or decode a Caesar-shifted message by shifting back.

What is a Caesar cipher?: A substitution cipher that shifts every letter by a fixed number of positions in the alphabet, wrapping from Z back to A.
How do I decode a message?: Switch Direction to Decode and enter the same shift amount that was used to encode it.
Does it preserve capitalization and punctuation?: Yes — letter case is preserved, and non-letter characters (spaces, punctuation, digits) pass through unchanged.

Every conversion runs in your browser. Nothing you paste here is sent to WebCodeIn’s servers, logged, or stored.