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Caesar Cipher

Encode or decode text with a Caesar cipher — one of the oldest and simplest classical ciphers. Shift each letter by a fixed number of positions through the alphabet.

0–25 positions through the alphabet

Plain: ABCDEFGHIJKLMNOPQRSTUVWXYZ
Cipher: DEFGHIJKLMNOPQRSTUVWXYZABC

No letters to analyze.

English avg: E 12.7%, T 9.1%

Caesar cipher is a toy cipher easily broken by frequency analysis. Never use it for real security — use AES or modern encryption instead. It's great for puzzles, education, and hidden messages.

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