ASCII Table & Lookup
A complete, searchable ASCII table for codes 0–127. See the decimal, hexadecimal, octal and binary value of every character, plus the names of the control codes like NUL, LF and CR.
| Dec | Hex | Oct | Binary | Char | Description |
|---|
ASCII — the American Standard Code for Information Interchange — is the 7‑bit encoding that assigns a number from 0 to 127 to every basic letter, digit, punctuation mark and control code. It is the foundation of digital text: when you type the letter A, your computer stores the number 65. Because UTF‑8 is a strict superset of ASCII, these 128 values still mean exactly the same thing on the modern web.
The table above is generated entirely in your browser. Each row shows the same character in four common numeral systems — decimal, hexadecimal, octal and 8‑bit binary — alongside the printable glyph (or the standard abbreviation for a non‑printing control code) and a short description. Use the filter box to jump straight to a code: search 65, 0x41, 101 (octal) or simply A.
Codes 0–31 and 127 are control characters — they don't draw a glyph but instead signal actions like a new line (LF, 10), a carriage return (CR, 13) or a tab (HT, 9). The visible characters run from 32 (space) to 126 (~).
ASCII shows up everywhere in networking. HTTP headers, DNS names and email are all ASCII text under the hood, and the classic CRLF line ending (codes 13 then 10) still separates lines in many internet protocols. If you want to see how those bytes are built, our Text to Binary converter encodes whole strings, and the Hex to Text converter turns raw bytes back into readable characters. To understand where these bytes travel, the guide on what an IP address is is a good next step.
Everything here is static and private: no lookups, no tracking, no network calls. Bookmark it as a quick reference whenever you need to decode a byte value or remember which control code does what.
Frequently asked questions
What is ASCII?
ASCII (American Standard Code for Information Interchange) is a 7‑bit character encoding that maps the numbers 0 to 127 to letters, digits, punctuation and control codes. It underpins nearly all modern text encodings, and UTF‑8 is a superset of it.
What are the control characters from 0 to 31?
Codes 0–31 (plus 127) are non‑printing control characters used by terminals and protocols. Common ones include NUL (0), TAB (9), LF / line feed (10), CR / carriage return (13), ESC (27) and DEL (127).
What is the ASCII code for a space?
The space character is decimal 32, hex 0x20, octal 040 and binary 00100000. It is the first printable character in the table.
Does this ASCII tool run offline?
Yes. The entire table is generated in your browser with JavaScript and no data is sent to any server, so it keeps working even without a network connection once the page has loaded.
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