Classic ciphers and codes

See how
ciphers work.

Try classic ciphers, see how each letter changes, and make puzzles you can print. Free tools for learners, teachers, and puzzle makers.

Explore ciphers Start with Caesar

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Experiment 01Caesar · Shift +3

Your messageHELLO, WORLD!

HELLO

KHOOR

H = 7→+ 3→K = 10

Encoded message

KHOOR, ZRUOG!

Step 1 of 10See every step →

Classical ciphers for learning and puzzles.Not for protecting confidential information.

01 / Explore

Find a cipher to try.

View all 16 methods

Caesar cipher

Substitution

Shift each letter by a fixed amount.

Vigenère cipher

Substitution

Repeat a letter key to change the shift.

Rail Fence

Transposition

Write in a zigzag, then read across each rail.

Morse code

Codes

Translate dots and dashes, then listen.

Print a puzzle to solve.

Make a practice sheet and keep the answers on a separate page.

Explore worksheets

Ideas to try

Plan a Three-Clue Classroom Cipher Trail

Use three short clues to lead learners from a desk to a book and on to a map.

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Help when you need it

Get Started with CipherSteps

Make your first Caesar conversion, follow one letter, and check the result in reverse.