How this calculator works
Alphabet positions use a stated ordered alphabet and ignore letter case. Reversed positions count from the end. A slash token marks a word space. Unicode modes instead encode every code point, including spaces, without changing case. Arabic uses the 28-letter abjadi-independent modern alphabet order shown by positions, Hebrew uses 22 base forms, Greek uses 24 uppercase letters, and Cyrillic uses the 33-letter Russian order including Ё. Final Hebrew forms and accented variants are not silently normalised.
Formula
A1Z26 position = alphabet index + 1; zero-based position = index; reversed position = alphabet length - index. Unicode modes write the scalar value in base 10, 16 or 2.
Worked example
ABC becomes 1 2 3 in Latin one-based mode and 26 25 24 in reverse mode. In Unicode decimal mode, Ab becomes 65 98.
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Frequently asked questions
Can I decode phone keypad numbers uniquely?
No. Each keypad digit represents several letters. The reverse tool shows the letter groups rather than guessing.
Do alphabet modes support punctuation?
Use only letters in the chosen alphabet and spaces. Unicode modes can encode punctuation and emoji.
Is a Unicode number the same as a UTF-8 byte?
No. Unicode values identify characters; UTF-8 can use several bytes for one value.