What Is an ASCII Table?
An ASCII table displays the full set of 128 ASCII (American Standard Code for Information Interchange) characters with their decimal, hexadecimal, octal, and binary values. ASCII is the foundational character encoding standard used in computers and communication equipment.
How to Use This ASCII Table
- Browse the table to find characters and their numeric codes.
- Search for a specific character or code value.
- Use the reference for programming, data conversion, or debugging.
Key Concepts
ASCII defines 128 characters: codes 0-31 are control characters (like newline, tab, and null), 32-126 are printable characters (letters, digits, punctuation, and space), and 127 is the delete character. ASCII uses 7 bits, allowing values from 0 to 127. Extended ASCII (8-bit) adds codes 128-255 for additional symbols, but these vary by encoding.
Frequently Asked Questions
What is the difference between ASCII and Unicode?
ASCII encodes 128 characters using 7 bits. Unicode is a superset that encodes over 149,000 characters from all writing systems. The first 128 Unicode code points are identical to ASCII.
Why are codes 0-31 called control characters?
They were designed to control devices like printers and terminals, not to display visible characters. Examples include carriage return (13), line feed (10), tab (9), and bell (7).
How do I find the ASCII code for a character?
Look up the character in the table. For example, uppercase A is 65 (decimal), 0x41 (hex), and 01000001 (binary). Lowercase a is 97 (decimal).