What mapping is used?

Default: A→0, B→1, …, J→9 (first 10 letters). Option for A→0, B→1, …, Z→25 or A=1, B=2, …, Z=26 (1-based).

What about lowercase?

By default both A and a map to 0, etc. Option to treat uppercase and lowercase differently if needed.

No. Only letters are converted; spaces, numbers, and punctuation stay as-is.

Replace letters A–J (or A–Z) with digits 0–9. A=0, B=1, … J=9, or full alphabet mapping. For puzzles or simple encoding.

InputLetter rangeNumbering

What mapping is used?: Default: A→0, B→1, …, J→9 (first 10 letters). Option for A→0, B→1, …, Z→25 or A=1, B=2, …, Z=26 (1-based).
What about lowercase?: By default both A and a map to 0, etc. Option to treat uppercase and lowercase differently if needed.
Do non-letters change?: No. Only letters are converted; spaces, numbers, and punctuation stay as-is.

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