ASCII Table Reference
Complete character encoding reference with decimal, hex, and binary
Display Options
ASCII Characters
| Dec | Hex | Binary | Char | HTML | Description | Action |
|---|
When to Use ASCII Table
Programming
Convert between characters and ASCII codes in C, Python, Java, and other programming languages
Data Validation
Validate input by checking if characters fall within acceptable ASCII ranges
Network Protocols
Understand control characters used in communication protocols and data transmission
Text Processing
Parse and manipulate text files by working with ASCII character codes directly
Encryption
Implement simple encryption algorithms like Caesar cipher using ASCII value shifts
Learning & Education
Study computer science fundamentals, character encoding, and digital representation of text
Frequently Asked Questions
What is ASCII?
ASCII (American Standard Code for Information Interchange) is a character encoding standard that represents text in computers and communication equipment. It uses 7 bits to represent 128 characters (0-127), including letters, numbers, punctuation, and control characters. ASCII is the foundation of most modern character encodings and is universally supported.
What are ASCII control characters?
ASCII control characters (0-31 and 127) are non-printable characters used for controlling devices and formatting text. Common examples include: NULL (0), TAB (9), LINE FEED (10), CARRIAGE RETURN (13), and DELETE (127). These characters don't display visually but perform functions like moving the cursor, starting new lines, or controlling communication protocols.
How do I use ASCII codes in programming?
In most programming languages, you can convert between characters and ASCII codes. In Python: ord('A') returns 65, chr(65) returns 'A'. In JavaScript: 'A'.charCodeAt(0) returns 65, String.fromCharCode(65) returns 'A'. In C: printf('%d', 'A') prints 65. ASCII codes are useful for character validation, encryption, and text processing.
What is the difference between ASCII and Unicode?
ASCII uses 7 bits to represent 128 characters (mainly English), while Unicode uses up to 32 bits to represent over 1 million characters from all languages and symbol systems. ASCII is a subset of Unicode - the first 128 Unicode characters (U+0000 to U+007F) are identical to ASCII. Use ASCII for simple English text and Unicode (UTF-8) for international content.
What are printable ASCII characters?
Printable ASCII characters are codes 32-126 that display visible symbols. This includes: space (32), digits 0-9 (48-57), uppercase letters A-Z (65-90), lowercase letters a-z (97-122), and punctuation/symbols like !@#$%^&*(). Codes 0-31 and 127 are non-printable control characters.
How do I convert between decimal, hex, and binary ASCII?
Use our ASCII table to quickly convert between formats. For example, letter 'A': Decimal 65 = Hex 41 = Binary 1000001. To convert manually: decimal to hex (divide by 16), hex to binary (each hex digit = 4 binary digits), binary to decimal (sum powers of 2). Most calculators and programming languages have built-in conversion functions.
Is this ASCII table free to use?
Yes, our ASCII table reference is completely free with no registration required. Search unlimited characters, view all encoding formats (decimal, hex, binary), copy values, and access the complete 128-character reference without any costs or limitations.
Why are there only 128 ASCII characters?
ASCII uses 7 bits for encoding, which allows for 2^7 = 128 unique values (0-127). This was sufficient for English text and basic symbols when ASCII was created in 1963. Extended ASCII (8-bit, 256 characters) was later developed for additional symbols, but standard ASCII remains the 128-character set that's universally compatible across all systems.
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