ASCII (American Standard Code for Information Interchange) is a 7-bit character encoding that maps 128 numbers to control characters, digits, letters, and symbols.

What is the ASCII value of 'A'?

Uppercase A is 65 (0x41); lowercase a is 97 (0x61). Digits 0-9 are 48-57.

What are control characters?

Codes 0-31 and 127 are non-printing control characters like tab (9), line feed (10), and carriage return (13).

What is the difference between ASCII and Unicode?

ASCII covers 128 characters; Unicode is a superset covering virtually all characters in every language, with UTF-8 being backward-compatible with ASCII.

How do I convert a character to its code?

Look it up here, or in code use functions like charCodeAt in JavaScript or ord in Python.

Reference

ASCII Code Table

All 128 ASCII characters with decimal, hex, octal, binary, and HTML codes. Click any character to copy it, or a chip to copy its code.