Write secret messages like a real spy! Type a message, choose a code, and see it scrambled instantly. Switch to decode to crack a message someone sent you. When you’re ready, print a spy sheet with the coded message and the key, which is perfect for treasure hunts, classroom puzzles and birthday parties.
Easy secret codes for kids
| Code | How it works | Difficulty |
|---|---|---|
| Backwards writing | Write the message right to left | ⭐ Easiest |
| Number code (A1Z26) | A = 1, B = 2 … Z = 26 | ⭐ |
| Atbash | Flip the alphabet: A ↔ Z, B ↔ Y | ⭐⭐ |
| Caesar cipher | Shift every letter by a secret number | ⭐⭐ |
| Pigpen cipher | Each letter becomes a shape from a grid | ⭐⭐ |
| Morse code | Dots and dashes you can tap, flash or beep | ⭐⭐⭐ |
| Keyword cipher | A secret word scrambles the alphabet | ⭐⭐⭐ |
A little history
Julius Caesar reportedly used a shift of 3 to protect military messages, which is why that cipher carries his name. The pigpen cipher was used by Freemasons in the 1700s, and Morse code, created in the 1830s–40s, carried telegraph messages around the world. SOS (··· ––– ···) is still the most famous Morse signal.
Fun ways to use secret codes
- Hide the clues of a treasure hunt in code (try our treasure map maker).
- Write coded lunchbox notes or birthday invitations.
- Run a classroom “escape room” where each code unlocks the next task.
Frequently asked questions
What is the easiest secret code for kids?
Backwards writing and the number code (A=1, B=2…) are the easiest. The Caesar cipher with a shift of 1 or 3 is a great next step.
How do you decode a Caesar cipher?
Shift every letter back by the same number used to encode it. If you don’t know the number, try all 25 shifts. One will make sense!
How does the pigpen cipher work?
Letters are placed in two tic-tac-toe grids and two X shapes (the second of each has dots). Each letter is replaced by the shape of the lines around it.
How do you write SOS in Morse code?
SOS is three dots, three dashes and three dots: ··· ––– ···.
Related tools
These are fun, classic ciphers for games and learning. They are not secure for real secrets or passwords. Everything runs in your browser.