Binary to Letters Table (A-Z, a-z)

Conversion Table: Uppercase Letters (A-Z)

Standard 8-bit binary representations for capital English letters.

Conversion Table: Lowercase Letters (a-z)

Standard 8-bit binary representations for lowercase English letters.

Common Word Examples

How to Read Binary Code: A Simple Guide

Binary code can look intimidating with its endless rows of 1s and 0s. However, the underlying logic is very straightforward once you understand how computers translate bytes into characters.

1. Understand the 8-Bit Grid

ASCII assigns numeric codes from 0 to 127 to characters. These values can be written using 7 bits or, with a leading zero, as 8-bit binary values. An 8-bit group is called a byte. In the tables below, each English letter is shown as an 8-bit binary representation of its ASCII code.

Each bit has a positional value. From left to right, the values are 128, 64, 32, 16, 8, 4, 2, and 1.

2. Turn the "Switches" On and Off

Think of 1 as "On" and 0 as "Off." If a position is active (1), you add its value to your sum. If it is inactive (0), you ignore it.

Let's decode the binary sequence 01000011:

• 128 → 0 (Off)
• 64 → 1 (On)
• 32 → 0 (Off)
• 16 → 0 (Off)
• 8 → 0 (Off)
• 4 → 0 (Off)
• 2 → 1 (On)
• 1 → 1 (On)

Adding the active bit values gives 64 + 2 + 1 = 67.

The decimal equivalent of this binary sequence is 67.

3. Match the Number to the ASCII Alphabet

For standard 8-bit ASCII codes representing English letters, the first three bits distinguish uppercase from lowercase letters:

• Uppercase letters (A–Z) range from decimal 65 to 90.
• Lowercase letters (a–z) range from decimal 97 to 122.

Since decimal 67 matches the letter C, the binary string 01000011 equals C.