A small tool for secret messages

Caesar Cipher Helper

Use the key. Match one letter. Build the message yourself.

Try a Museum Sandi puzzle

Changing the message or key starts a new attempt.

1. Select an encrypted character
2. Use the alphabet guide

Top: encrypted letter. Bottom: decoded letter. Choose the pair that matches your selected character.

Only A–Z and a–z change. Spaces, punctuation, and other characters stay the same.

The museum puzzles use groups of letters, not word spaces. Add word spaces yourself. Extra letters at the end can be padding.