What is the Braille alphabet mapper?
Inspect the six-dot patterns for lowercase Latin letters and convert a supported letter-only sample into Unicode cells. Decoding interprets the supported cells as isolated alphabet letters. It cannot determine their meaning inside contracted or numeric Braille.
How to map and inspect letters
- Choose Letters to Braille or Alphabet cells to Letters.
- Enter lowercase a to z, spaces and line breaks. Enable Map uppercase letters to lowercase only if losing case is acceptable.
- Resolve any error, then use Copy output or select the full output field manually.
- Select a chart letter to see its active dots and Unicode value. Use output as input to check the supported alphabet round trip.
Worked examples and scope boundaries
| Input | Result | Meaning |
|---|---|---|
| abc | ⠁⠃⠉ | Isolated lowercase alphabet cells; decodes to abc. |
| hello world | ⠓⠑⠇⠇⠕⠀⠺⠕⠗⠇⠙ | The space becomes a blank Braille pattern. |
| A | Error by default; ⠁ with lowercase option | Optional case loss, not a capital indicator. |
| 1 or (a) | Error, empty output | Numbers and punctuation need contextual rules. |
Understand the dot positions
From the reading side, dots 1, 2 and 3 run down the left column; 4, 5 and 6 run down the right. The cell for a uses dot 1, b uses dots 1 and 2, and c uses dots 1 and 4. Select a letter in the explorer to compare a filled pattern with its numbered positions.
Unicode patterns are not complete Braille transcription
Unicode assigns characters to dot patterns; a Braille code supplies their meaning in context. UEB includes numeric, capital, punctuation and contraction rules. The same pattern can have a different meaning depending on its context. Even uncontracted Braille needs more than a one-cell substitution map.
This mapper deliberately rejects unsupported cells, indicators, digits and punctuation rather than guessing. Numbers reuse letter patterns with numeric context, so emitting the cell for a alone would not identify the number 1. It preserves ordinary spaces and CR/LF line breaks within its helper; tabs and other whitespace are unsupported. A blank U+2800 cell becomes an ordinary space when decoded. Case can only be discarded with the explicit option. Fonts, clipboard behavior and assistive technology can vary. A screen glyph is not a raised-dot label: use a reviewed transcription workflow for tactile or accessible materials.
Sources and related reading
Unicode Braille Patterns chart identifies the encoded dot patterns. ICEB’s Rules of Unified English Braille, sections 6 to 8, explain why numeric, punctuation and capital handling require additional rules. These references define patterns and context; they do not certify this tool as a transcriber.