ASCII (American Standard Code for Information Interchange) is a character encoding standard that assigns numbers 0-127 to letters, digits, punctuation, and control characters. For example, A=65, a=97, 0=48, space=32.

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Convert text to ASCII codes or ASCII codes back to text

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✅ ASCII Codes

ASCII Character Reference Table

The printable ASCII characters range from code 32 (space) to 126 (~). Here are the most commonly referenced printable ASCII codes.

Char	Dec	Hex	Binary	Char	Dec	Hex	Binary

Common ASCII Codes Quick Reference

A-Z

Uppercase Letters

A=65, B=66, C=67 ... Z=90. Uppercase letters occupy ASCII codes 65 through 90 in sequential order.

a-z

Lowercase Letters

a=97, b=98, c=99 ... z=122. Lowercase letters occupy ASCII codes 97 through 122. Exactly 32 higher than uppercase.

0-9

Digits

0=48, 1=49, 2=50 ... 9=57. Numeric digits occupy ASCII codes 48 through 57.

␣

Space & Control

Space=32, Tab=9, Newline=10, Carriage Return=13, Null=0. Control characters occupy codes 0 through 31.

!@#

Punctuation

!=33, "=34, #=35, $=36, %=37, &=38, '=39, (=40, )=41, *=42, +=43, ,=44, -=45, .=46, /=47.

DEL

Extended

DEL=127 is the last ASCII character. Codes 128-255 are extended ASCII (varies by encoding). Standard ASCII uses only 0-127.

Frequently Asked Questions

What is ASCII?

ASCII (American Standard Code for Information Interchange) is a character encoding standard that assigns a number (0-127) to each letter, digit, punctuation mark, and control character. For example: A=65, a=97, 0=48, space=32. It was developed in the 1960s and remains the foundation of all modern text encoding.

What is the ASCII code for A?

The ASCII code for uppercase A is 65 (decimal), 41 (hexadecimal), or 01000001 (binary). Lowercase a is 97 decimal. The difference between uppercase and lowercase ASCII codes is always 32.

What is the difference between ASCII and Unicode?

ASCII uses 7 bits and covers only 128 characters — English letters, digits, and basic symbols. Unicode is a superset that covers over 140,000 characters from all world writing systems, including emoji, Chinese, Arabic, Hindi, and every other script. ASCII is fully compatible with Unicode (UTF-8).

How do I convert text to ASCII codes?

Each character maps to a number: A=65, B=66, space=32, etc. To convert "Hi": H=72, i=105. This tool does the conversion automatically — just type text in the left box and select your output format (decimal, hex, binary, or octal).

What are hex ASCII codes used for?

Hexadecimal ASCII codes are used in programming, debugging, and data inspection. They appear in URL encoding (%20 = space), HTML entities, memory dumps, network packet analysis, and many programming languages where hex notation is more readable than decimal.

What is the ASCII code for a newline?

ASCII code 10 is a Line Feed (LF, \n) — the newline character on Unix/Mac systems. ASCII code 13 is a Carriage Return (CR, \r) — used in older Mac systems. Windows uses both together: CR+LF (13+10, \r\n) to mark end of line.