- Write your message to code (or decode) into the big text block
- If it's already coded, click "Send to Coded"; if it's currently readable, click "Send to Decoded"
- Type the key into the "key" box
- If text is currently coded (unreadable) click "Decode"; if it's currently decoded (readable) click "Code"
- Your code should appear, both coded and decoded, below the big text area
Note: only the following special characters accepted: , . - ' ? / \ ! @ # $ % ^ * ( ) + = ~ " ; :