Secret Code Worksheets for Kids
A growing collection of free, printable secret-code worksheets — from gentle number codes for younger students to Caesar, Morse, binary and substitution ciphers for older kids. Every worksheet has a matching answer key, so they are ready to print and hand out with no prep. Pick one below to preview, download the PDF, or work through it online.
Every worksheet here is a real printable with a matching answer key — free to download and photocopy for classroom use.