How it works
This cryptogram maker turns any sentence into a letter-swap code. Every letter is written as another letter, and no letter ever stands for itself. Type your own message of up to 300 characters, or solve one of 163 quotes from proverbs, poems, plays and speeches. Solve it on screen, or print it with a tracker grid and an answer key.
Read the full guide
Make a puzzle from your own words
Type a sentence, a riddle answer or a secret message in the box at the top, and the puzzle follows as you type. The text needs at least 5 letters, 3 of them different, and can run to 300 characters. Letters are swapped. Numbers, spaces and punctuation stay put, and accents are dropped. A message of 60 to 120 letters repeats its common letters often enough to give solvers a way in. A five-word message is far harder, so give more letters away. Every press makes a new random code, so one message can be printed in several versions.
Starting letters, hints and checking
Under Letters given at the start, press a number from 0 to 5. Type a guess in any box and every box with the same code letter fills in. The tool refuses a guess that makes a letter stand for itself. Check marks wrong guesses and offers to take them out. Hint gives the most common letter you have not found. Start over can be undone.
Print it, share it, come back to it
Print puzzle gives a Letter or A4 sheet with a name and date line, the puzzle and an A to Z grid for keeping track. The answer key prints on a second page. Untick Print the answer key too to leave it off. Share copies a link that opens the same puzzle with empty boxes. Solved quotes are counted in this browser, New puzzle deals unsolved ones first, and an unfinished puzzle is there again when you return.
- Start with one-letter words, which can only be A or I. Then look after an apostrophe, where the letter is nearly always S or T.
- E, T and A are the most common letters in English, so the code letter you see most is a fair first guess for E. Common doubled letters are LL, EE, SS, OO and TT.
- For a class, make the puzzle from the key sentence of the lesson: a science fact, a spelling rule, the answer to a riddle. Pupils read it several times while they solve it.
- The pangram in the list uses all 26 letters, so solving it uncovers the whole code. The nonsense verse is the hardest, because made-up words defeat guessing by word shape.
Questions and answers
What is a cryptogram and how does the code work?
A cryptogram is a short text written in a substitution cipher. The 26 letters are shuffled into a secret key, and each letter of the message is replaced by its partner, the same one every time. If X stands for E in one word, it stands for E everywhere. It is not a fixed shift along the alphabet, so you solve it by word patterns and letter counts.
How do you solve a cryptogram?
Fill in one-letter words, then short common words. A three-letter word that appears twice is often THE, which gives you T, H and E at once. Every letter you place shows across the whole board, so check that half-built words still look like English, and take out any guess that produces nonsense.
What age is this suitable for?
As a rough guide, third and fourth graders manage a short proverb with 3 to 5 letters given, working in pairs. Fifth grade and up can start from 2, and a Shakespeare line with none given is a fair challenge for adults. The list below the tool shows every quote with its source, so you can read them first and type in the one you want.
Can I send someone a secret message?
Yes. Make the puzzle from your words and use Share. The link carries your message in code together with the key, so treat it as a puzzle, not as real secrecy, and keep student names and private details out of it. What you type stays in this browser unless you share the link. Text too long for a link can be printed.
Where do the quotes come from, and are they accurate?
All 163 were matched word for word against the full text of the book, poem, play or speech on Project Gutenberg or Wikisource, and the proverbs against a reference list. Famous lines that turned out to be misquoted or credited to the wrong person were left out. Every named author died before 1929, so the words are in the public domain. The source appears when you solve the puzzle.