Online ASCII Table Lookup
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Try another search keyword or switch categoryAbout the ASCII Table
What is ASCII?
ASCII (American Standard Code for Information Interchange) is a character encoding system based on the Latin alphabet, established by the American National Standards Institute (ANSI) in 1963. It uses 7-bit binary numbers (0-127) to represent 128 characters. It is one of the most fundamental and widely used character encoding standards in computing and an important foundation of modern Unicode and UTF-8 encoding.
The three main categories of ASCII codes
1. Control characters (0-31 and 127): non-printable, used to control device behavior, such as line feed (LF=10), carriage return (CR=13), backspace (BS=8), bell (BEL=7), horizontal tab (HT=9), delete (DEL=127), etc. 2. Printable characters (32-126): include space, digits, uppercase and lowercase letters, and punctuation, and can be displayed and output directly. 3. Extended characters (128-255): country/vendor-specific; this tool only shows the standard 0-127.
Common encoding representations
The same character can be represented in multiple numeral systems. For example, uppercase letter "A": decimal 65, hexadecimal 0x41, octal 0101, binary 01000001. Programming often uses hexadecimal (such as "\x41") and binary. Understanding these conversion relationships is essential for learning programming, network protocol analysis, reverse engineering, and data encoding processing.
Tips
Use the search box to quickly locate characters: enter "A" to find letters, or enter "65", "0x41", or "01000001" to locate uppercase letter A. Click any card to copy the corresponding character to the clipboard. Click "Copy entire table" to copy all visible characters at once, and click "Export CSV" to save a table file for viewing or further analysis in Excel.