Tap code
Turn a message into taps or dots.
Encode text as tap code, or decode dot sequences with a 5×5 grid where C/K share a cell.
Settings
Conversion direction
Tap symbol
Letter separator
Source text / code
0 source char.
Result
Add source text or code.
Tap-code grid
Classic 5×5 tap-code grid with C/K in the same cell.
Quick explanation
Choose the conversion direction and tap symbol. The result updates automatically, with the tap-code grid visible to explain each pair.
Try this too
Need numeric coordinates?
Polybius square shows the same logic as a grid and row-column numbers.
Additional information
Tap code: the Polybius square as taps
Tap code uses the same 5×5 grid idea, but instead of writing coordinates directly, it transmits them with two tap groups: first the row, then the column.
Principle
A letter such as S maps to 43 in the grid. In tap code, that becomes four taps, a pause, then three taps.
Historical use
Tap code is often associated with discreet communication, especially in situations where someone can tap on a wall or surface but cannot speak freely.
Difference from Polybius
The Polybius square focuses on the grid and numeric coordinates. Tap code focuses on rhythmic transmission.
| Letter | Coordinate | Tap code |
|---|---|---|
| A | 11 | • • |
| C/K | 13 | • ••• |
| S | 43 | •••• ••• |
Which tool should you choose?
Use tap code when you want to represent a message as taps or dots. Use the Polybius square when you prefer working with numeric coordinates and the grid. To learn more, see the Wikipedia page about tap code.
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