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Learn Binary for Computer Science

Understand how computers store text as binary β€” see exactly how letters map to 8-bit ASCII bytes.

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Separate bytes by:
Text input
Binary output
01001000 01100101 01101100 01101100 01101111
5 characters5 bytes40 bits

Education tips

πŸŽ“

Type any letter and see its 8-bit binary representation. "A" = 01000001 (65 in decimal). Capital letters differ from lowercase by one bit (bit 5).

πŸ’‘

"A" = 01000001, "a" = 01100001. The only difference is bit 5 (0-indexed from right). This is why toggling case can be done with a single bitwise OR/AND.

πŸ”’

The stats panel shows total bytes and bits. "Hello" = 5 characters = 5 bytes = 40 bits β€” one byte (8 bits) per ASCII character.

🌐

Non-ASCII characters (emoji, accented letters) use 2–4 bytes each in UTF-8. Try typing "πŸ‘‹" and see how many bytes it uses.

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