Cryptogram Solver
Paste any substitution cipher below and our AI will decode it instantly. Works on cryptograms from puzzle books, newspapers, and anywhere else — no signup required.
If you know anything about the quote — the topic, the author, or where it's from — add it as a clue to improve accuracy on shorter ciphers.
Quick Tips
- Single-letter words are almost always A or I
- Most frequent cipher letter is usually E, then T, A, O
- Apostrophe patterns — X'T = N'T (isn't, can't) · X'S = possessive or IS
- Double letters — almost always LL, SS, EE, TT, or OO
- Two-letter words — IS, IT, IN, AT, TO, OF are most common
- Add a clue — even "inspirational quote" helps the AI narrow it down
How to use this cryptogram solver
Paste your ciphertext into the box and click Solve with AI. The tool sends your cipher to an AI model that analyzes the substitution pattern and returns the decoded text along with the full cipher key — the mapping of every cipher letter to its plain letter equivalent.
If you know anything about the quote — the author, the subject, or where the puzzle came from — enter it in the clue field before solving. Even vague context like "inspirational quote" or "about nature" significantly improves accuracy on shorter ciphers where pattern analysis alone is less reliable.
You can also click Solve Manually to work through the cipher yourself using the interactive grid. The frequency analysis panel and pattern tips update as you fill in letters, giving you the same guidance that experienced cryptogram solvers use.
What is a cryptogram?
A cryptogram is a piece of text — usually a famous quote — encrypted with a simple substitution cipher. Every letter of the alphabet has been swapped for a different letter, and that substitution is consistent throughout the entire puzzle. Punctuation, spaces, and numbers are left unchanged, which preserves word structure and gives you important starting clues.
What this solver can and can't do
This tool is designed for standard single-alphabet substitution ciphers — the kind used in newspapers, puzzle books, and cryptoquote games. It works best on ciphers of 40 letters or more. It won't work on Vigenère ciphers, transposition ciphers, or other more complex encryption methods. If your cipher uses a consistent letter-for-letter substitution and the underlying text is English, this tool should decode it.
Want to get better at solving cryptograms yourself? Read our complete solving guide or try today's daily puzzle.