ASCII Table Reference

What is ASCII Table Reference?

ASCII Table Reference provides an interactive, searchable table of all 128 ASCII characters including control characters (0-31), printable characters (32-126), and the delete character (127). Each entry shows the decimal, hexadecimal, octal, binary, and HTML entity values alongside the character glyph and its official name. The tool also includes extended ASCII (128-255) and common Unicode characters.

Systems programmers working with binary protocols, embedded developers handling character encoding, and computer science students learning about character representation. The tool runs entirely in your browser — your data never leaves your device.

How to Use ASCII Table Reference

1. Browse the full ASCII table scrolling through all 128 characters
2. Search by character, name, decimal value, or hex code in the search bar
3. Click on any character to see its full detail card with all representations
4. Filter by category — control characters, uppercase letters, lowercase letters, digits, or symbols
5. Copy any representation (decimal, hex, binary, HTML entity) from the detail view

Common Use Cases

• Looking up ASCII values for control characters like null (0), tab (9), and newline (10)
• Finding the decimal or hex code for special characters needed in low-level programming
• Understanding character encoding by referencing the relationship between characters and their numeric values
• Debugging string issues involving non-printable control characters in data streams
• Converting between character representations for embedded systems and protocol implementations

Pro Tips

• ASCII 48-57 are digits 0-9, 65-90 are uppercase A-Z, and 97-122 are lowercase a-z — the uppercase/lowercase difference is always exactly 32 (one bit flip)
• Carriage return (13, \r) and line feed (10, \n) together form \r\n (CRLF) used by Windows, while Unix uses just \n (LF) — mixed line endings cause many subtle bugs in cross-platform development
• Character 127 (DEL) was originally the rub out character on paper tape — every hole punched through, creating a blank. It is the only control character above 31

Why Use This Tool?

• Privacy-first: All processing happens locally in your browser. No data is transmitted to any server.
• No installation required: Works in any modern browser on desktop or mobile.
• Completely free: No account, no credit card, no usage caps.
• Fast and reliable: Powered by modern Web APIs for near-instant results.

Related Concepts

Learn more about related topics: Unicode, UTF-8, Control characters, Extended ASCII.

Frequently Asked Questions