Free Cryptogram & Code Breaker Generator

Create Printable Cryptogram Puzzles — 100% Free

ClassPrint's code breaker generator makes print-ready number-substitution cryptograms — crack the key, decode the message. Every pack downloads as a PDF with a full answer key — no app to install, no ads.

Make Your Own — Free Download Free Sample

No signup for the sample Letter & A4 Answer key included

Free printable Easy cryptogram code breaker puzzle with answer key, generated by ClassPrint's code breaker generator

How it works

Make a code breaker puzzle in three steps

Pick a difficulty

Easy (short fun facts), Medium or Hard (longer sayings), or Mixed for all three.

Set puzzle count and paper size

Choose how many puzzles you need and Letter or A4 paper.

Download and print

Get a print-ready PDF with a full answer key — print at home or in the classroom in seconds.

Code breaker answer key page showing the cracked message for every cryptogram puzzle, included free with every ClassPrint code breaker pack

Every puzzle pack includes a full answer key

No more cracking every code yourself to check the answers. Every ClassPrint code breaker download includes a matching answer key page showing the decoded message for every puzzle — so grading or self-checking takes seconds.

Number-substitution cryptograms, not letter puzzles

Each puzzle hides its message behind a number key — every letter of the alphabet is swapped for a number, and solvers work backwards from the pattern to crack the code. It's a different mechanic from letter-swap cryptogram formats, so the logic feels fresh even for solvers who've done plenty of classic cryptograms before.

Fun facts for beginners, sayings for a real challenge

Easy puzzles decode short, fun facts — a gentle way to learn how cryptograms work. Medium and Hard puzzles decode longer motivational sayings, giving more experienced solvers a real workout. Generate a Mixed pack to combine all three difficulty levels in one book.

Free printable code breaker worksheets, no app required

No downloads, no ads, no in-app purchases — just a print-ready PDF you generate and print. Great for classrooms, homeschool lessons, or quick brain-teaser practice with pencil and paper.

Built for teachers, tutors, and parents at home

Whether you're printing a warm-up brain teaser for class, a tutoring session, or extra practice at home, ClassPrint gives you a print-ready PDF in seconds — no design software, no subscriptions to try it.

Code Breaker Generator FAQ

Is this cryptogram generator really free?

Yes. You can download a free sample code breaker puzzle with no signup required, and every new ClassPrint account gets 15 free tokens to generate your own puzzles — no card required.

What kind of cipher is this?

A number-substitution cryptogram — every letter is swapped for a number using a key, and solvers crack the code to reveal the hidden message. Easy puzzles use short fun facts, and Medium and Hard puzzles use longer motivational sayings.

Can I choose the difficulty?

Yes. Choose Easy, Medium, or Hard, or generate a Mixed pack that works through all three levels in one book.

Do the puzzles include an answer key?

Yes. Every code breaker pack downloads as a print-ready PDF in Letter or A4 size, complete with a full answer key showing the cracked message for every puzzle.