📋 ASCII Table Viewer
Display complete ASCII character set with decimal, hex, and binary values in an interactive table format
Your Result:
| Dec | Hex | Char | Description |
| 65 | 0x41 | A | Uppercase A |
| 66 | 0x42 | B | Uppercase B |
| 67 | 0x43 | C | Uppercase C |
How to Use This ASCII Table Viewer
How to Use the ASCII Table Viewer:
- Select which columns to display using the checkboxes:
- Decimal: Standard ASCII codes 0-127
- Hexadecimal: ASCII codes in base-16 format (0x00-0x7F)
- Binary: ASCII codes in 8-bit binary format
- Descriptions: Character names and control character meanings
- Toggle "Highlight Printable Characters" to distinguish visible characters from control characters
- Click "Generate Table" to display the complete ASCII reference
- Browse the table to find specific characters and their corresponding values
- Use the copy function to copy the entire table to your clipboard
- Download the table as a text file for offline reference and documentation
Pro Tips: Enable binary view to understand bit patterns, and use descriptions to learn about control characters like TAB, CR, and LF!
How It Works
Understanding ASCII Character Encoding:
The ASCII (American Standard Code for Information Interchange) table is the foundation of text representation in computers:
- Character Range: ASCII defines 128 characters (0-127) including control characters, digits, letters, and symbols
- Control Characters (0-31): Non-printable characters for text formatting and device control (TAB, CR, LF, ESC)
- Printable Characters (32-126): Visible characters including space, punctuation, digits, and letters
- DEL Character (127): Delete control character, historically used for character deletion
- Number System Representation: Same values shown in decimal, hexadecimal, and binary formats
Practical Applications:
- Programming: Character comparison, string manipulation, data validation
- Web Development: HTML entities, URL encoding, form data processing
- Network Protocols: Communication standards, data transmission formats
- File Formats: Text file encoding, CSV parsing, configuration files
- Debugging: Understanding character encoding issues and data corruption
When You Might Need This
- • Programming reference for character encoding and string manipulation
- • Educational tool for learning ASCII values and character representations
- • Debugging text processing applications and character conversion issues
- • Web development for understanding HTML entity codes and character encoding
- • Data analysis when working with legacy systems using ASCII encoding
- • Network protocol development requiring specific ASCII control characters
- • Embedded systems programming where ASCII codes are used for communication
- • Text parsing and validation in applications requiring ASCII compliance
- • Character set reference for developing cross-platform applications
- • Technical documentation and specification writing requiring ASCII references
Frequently Asked Questions
What is the difference between ASCII and Unicode character sets?
ASCII is a 7-bit character encoding standard that represents 128 characters (0-127), including control characters, digits, letters, and symbols. Unicode is a much larger character encoding standard that can represent over a million characters from multiple languages and scripts. ASCII is a subset of Unicode - the first 128 Unicode characters are identical to ASCII characters.
Why do some ASCII characters show as control characters instead of visible symbols?
ASCII codes 0-31 and 127 are control characters (like TAB, ENTER, ESC) that were designed to control text formatting and communication protocols rather than display visible characters. These characters perform specific functions like line breaks, carriage returns, and terminal control. Only ASCII codes 32-126 represent printable characters that you can see on screen.
How do I use hexadecimal and binary ASCII values in programming?
Hexadecimal (base-16) and binary (base-2) are alternative representations of the same ASCII decimal values. In programming, you might use hex values like 0x41 for 'A' in low-level operations, memory dumps, or when working with character encodings. Binary values are useful in bit manipulation operations and when understanding the underlying data representation in computer memory.
Can I copy or download the ASCII table for offline reference?
Yes, this tool provides copy and download functionality. You can copy the entire ASCII table to your clipboard for pasting into documents, or download it as a text file for offline reference. The downloaded format includes all selected columns (decimal, hex, binary, descriptions) based on your current display preferences.
What's the practical difference between extended ASCII and standard ASCII?
Standard ASCII covers characters 0-127 (7-bit), while extended ASCII uses the full 8-bit range (0-255) to include additional characters like accented letters and symbols. However, extended ASCII varies between different systems and encodings. This tool focuses on standard ASCII (0-127) because it's universally consistent across all systems and forms the foundation of most character encoding standards.