What is the Tap Code tool?

Grid-based knock/tap cipher used by prisoners. This free online tool is available at NumbersChecker with no login required.

Is the Tap Code tool free?

Yes, the Tap Code tool is completely free to use at NumbersChecker. No account or installation is needed — results are instant.

How do I use the Tap Code tool?

Enter your input into the form at https://numberschecker.com/tool/tap-code, click Run, and the result appears instantly. Click any result value to copy it to your clipboard.

Is there an API for the Tap Code tool?

Yes. Send a POST request to https://numberschecker.com/api/tap-code with your input as a JSON body. The API is free and requires no authentication.

Ciphers prisonknock

Tap Code

Grid-based knock/tap cipher used by prisoners.

About the Tap Code Tool

Grid-based knock/tap cipher used by prisoners. This free online tool runs entirely in your browser — no login, no installation, and no data is stored.

This tool is part of the Ciphers category on NumbersChecker. Browse all Ciphers tools or explore all 139 tools.

Related: prison · knock

API usage

POST /api/tap-code
Content-Type: application/json

{
  "text": "your input here"
}