Encode and decode secret messages online, for free. Pick a cipher, type your message, print the decoding grid — perfect for an escape room, a treasure hunt or a birthday party.
🏛️
Shift every letter of the alphabet — from classic ROT13 to Julius Caesar's own cipher.
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🪞
The mirror cipher: A becomes Z, B becomes Y, and the whole alphabet flips.
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📻
Turn any message into dots and dashes, just like old-school telegraph operators.
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🔢
Every letter becomes its place in the alphabet: A=1, B=2, all the way to Z=26.
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📟
The 2000s texting code: A=2, B=22, C=222 — tap-tap-tap, just like an old flip phone.
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🗝️
A Caesar cipher with a secret keyword, once called unbreakable for 300 years.
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🏺
Every letter becomes a pair of digits, thanks to a simple 5x5 grid.
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🎭
Every letter hides inside a group of five A's and B's.
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〰️
Your message zigzags across several rails, then gets read off line by line.
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🧩
The geometric symbol alphabet Freemasons have used for private letters for centuries.
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With CrackAndReveal, your coded message becomes a virtual lock to crack: players decipher your code, enter the solution and reveal your surprise.
Create a free lock