ASCII Code Converter and Table
Convert characters to ASCII codes in decimal, hex, binary, or octal formats, and convert ASCII codes back to characters. Includes a complete ASCII table for quick reference.
How the ASCII Code Converter Works
Our ASCII code converter translates text to and from ASCII (American Standard Code for Information Interchange) numeric codes. Each character is represented by a number from 0-127, providing a fundamental encoding scheme still used in computing and data communication.
Conversion Process
- Input text is processed character by character
- Each character is mapped to its ASCII code (0-127)
- Codes are output in selected format (decimal, hex, octal, or binary)
- For decoding, numeric codes are converted back to characters
- Control characters (0-31) are identified but not displayed
- Extended ASCII (128-255) is supported for decoding
The tool includes a complete ASCII table reference showing decimal, hexadecimal, octal, and binary representations for all 128 ASCII codes, along with character descriptions and control character names.
Common Use Cases
Programming Education
Learn character encoding fundamentals and understand how computers represent text internally.
Data Protocol Analysis
Analyze and debug serial communication, terminal protocols, and legacy systems using ASCII codes.
Control Character Handling
Work with control characters (CR, LF, TAB, ESC) for terminal output and file format processing.
Character Encoding Debugging
Identify encoding issues by examining raw ASCII values of problematic text.
Retro Computing
Work with legacy systems and file formats that use ASCII encoding exclusively.
Security Analysis
Analyze payloads, shellcode, and encoded data in security research and penetration testing.
What to Know Before Using This Tool
ASCII Code Ranges
Output Format Options
- Decimal: Standard ASCII numbers (65 for 'A')
- Hexadecimal: Base-16 representation (41 for 'A')
- Octal: Base-8 representation (101 for 'A')
- Binary: Base-2 representation (01000001 for 'A')
Unicode vs ASCII
ASCII only covers 128 characters (English alphabet and basic symbols). For international text, use UTF-8 encoding. This tool handles ASCII range primarily but can decode extended values (128-255) as UTF-8 bytes.
Frequently Asked Questions
What is ASCII?
ASCII (American Standard Code for Information Interchange) is a character encoding standard developed in the 1960s. It assigns numeric codes 0-127 to English letters, digits, punctuation, and control characters.
What are control characters?
Control characters (codes 0-31 and 127) are non-printable codes that control device behavior. Examples include TAB (9), LF/Line Feed (10), CR/Carriage Return (13), and ESC (27).
Why use octal or binary output?
Octal was historically used in Unix permissions and some programming contexts. Binary shows the actual bit patterns, useful for understanding low-level data representation and bitwise operations.
Can I convert non-English text?
ASCII only supports English characters. For accented letters, non-Latin scripts, or emojis, the text is encoded as UTF-8 bytes, which may produce multiple ASCII values per character.
How do I find a specific ASCII code?
Use the ASCII table reference with the search function. Search by character, code number, or description to quickly find the ASCII value you need.
What is the ASCII code for space?
Space is ASCII code 32 (decimal), 0x20 (hex), 040 (octal), or 00100000 (binary). It is the first printable ASCII character after the control characters.
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