ASCII (American Standard Code for Information Interchange) assigns numeric values to 128 characters: letters, digits, punctuation, and control characters. Unicode extends this to over 149,000 characters covering every writing system. This converter shows the numeric code for any character in decimal, hex, octal, and binary — or converts codes back to characters.
How to Use
Two modes:
- Text → Codes: Type or paste text to see each character's code in decimal, hex, octal, and binary
- Codes → Text: Enter space-separated decimal values to see the corresponding characters
ASCII Character Ranges
- 0-31: Control characters (NUL, TAB, LF, CR, ESC, etc.)
- 32-47: Symbols and punctuation (space, !, #, $, etc.)
- 48-57: Digits 0-9
- 65-90: Uppercase A-Z
- 97-122: Lowercase a-z
- 127: DEL control character
ASCII vs Unicode vs UTF-8
ASCII uses 7 bits (128 characters). Unicode is a character set with 149,000+ characters. UTF-8 is the most common encoding of Unicode, using 1-4 bytes per character. ASCII characters (0-127) are identical in UTF-8.
Step-by-Step Instructions
- 1Enter text to see ASCII/Unicode values for each character.
- 2Or enter decimal codes separated by spaces to see the characters.
- 3View each character in decimal, hex, octal, and binary.
- 4Use the reference table for quick lookups.
- 5Copy conversion results for use elsewhere.