Binary Alphabet: A–Z in Binary Code

The Two Rules That Decode Any Letter

You do not need to memorize 52 codes. The letter codes come from ASCII, and they follow two rules.

Decode 01100101: it starts with 011, so it is lowercase; the last five bits 00101 are 5, and the 5th letter is e. Or take 01010110: 010 says uppercase, 10110 is 22, and the 22nd letter is V. That is the whole trick — case from the front, letter from the back.

Full Binary Alphabet Chart: A–Z, a–z, 0–9

All 62 letters and digits with their binary, decimal and hex values. Type a character or number to filter the rows.

How to Write Your Name in Binary

Take “Sam”. Use the chart or the two rules: S is the 19th letter, uppercase, so 010 + 19 (10011) = 01010011; a is the 1st letter, lowercase: 01100001; m is the 13th, lowercase: 01101101. Joined together, “Sam” in binary is:

01010011 01100001 01101101

Check it in the binary code translator, then try your own name letter by letter.

Practice

1. Decode 01101110 using the two rules. It starts with 011, so lowercase; the last five bits 01110 are 14 — and the 14th letter is n.

2. Encode the letter G. G is the 7th letter, and 7 is 00111. Uppercase takes the 010 prefix, so the answer is 01000111 (decimal 71).

3. Challenge — decode 01001010 01101001 01101101. Byte by byte: 010 + 10 = J, 011 + 9 = i, 011 + 13 = m. The message is “Jim”.