What Is ASCII? Understanding Character Codes
Every character you type becomes a number behind the scenes, and ASCII is the original standard that made that possible. It's a foundational piece of how computers handle text.
What ASCII is
ASCII (American Standard Code for Information Interchange) maps characters to numbers 0–127. "A" is 65, "a" is 97, "0" is 48, space is 32. The first 32 codes are invisible "control characters" (like newline and tab). With 7 bits you can represent all 128.
Why it still matters
ASCII is the basis of how text is stored and sorted (it's why uppercase sorts before lowercase — 'A' (65) comes before 'a' (97)). Understanding it explains a lot of "why does my data sort like this?" puzzles.
From ASCII to Unicode
ASCII only covers English. Unicode (via UTF-8) extends the idea to every language and emoji, while keeping the first 128 codes identical to ASCII — so ASCII is essentially a subset of modern text encoding.
Convert it
Our free text to ASCII and ASCII to text converters show the codes for any text. See also how characters become binary.
Bottom line
ASCII maps characters to numbers 0–127 — the foundation of digital text and the reason text sorts the way it does. Unicode/UTF-8 builds on it for the whole world's characters while staying backward-compatible.
