What is the difference between ASCII and Unicode?

ASCII is a 7-bit encoding with 128 characters (0-127). Unicode is a superset that supports over 140,000 characters across the world's writing systems. UTF-8, the most common Unicode encoding, uses the same byte values as ASCII for the first 128 characters, making ASCII a subset of Unicode.

What are control characters?

Control characters (0-31 and 127) are non-printable characters originally designed for teletype control. They include tab (HT, 9), line feed (LF, 10), carriage return (CR, 13), and escape (ESC, 27). They're still used in network protocols, file formats, and terminal control sequences.

Why does the ASCII table show octal and binary?

Octal and binary are useful in low-level programming. Unix file permissions use octal notation (e.g., chmod 755). Binary is essential for understanding how characters are stored at the bit level. Having all representations in one table saves you from converting between formats manually.

What is extended ASCII?

Extended ASCII refers to 8-bit encodings that use values 128-255 for additional characters like accented letters and box-drawing characters. Unlike standard ASCII (0-127), extended ASCII is not standardized — different code pages (ISO 8859-1, Windows-1252) assign different characters to the same values.

How do I type ASCII characters using keyboard shortcuts?

On Windows, hold Alt and type the decimal code on the numeric keypad (e.g., Alt+65 for A). On macOS, use the Character Viewer. On Linux, use Ctrl+Shift+U followed by the hex code. The table shows the exact codes you need for each method.

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ASCII Table Reference

An ASCII table reference shows all 128 ASCII characters with their decimal, hexadecimal, octal, and binary values. Control characters (0-31) display abbreviations and escape sequences. The first 128 ASCII values are identical to UTF-8.

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What is ASCII Table Reference?

An ASCII table reference is a tool that displays all 128 ASCII characters alongside their decimal, hexadecimal, octal, and binary representations, with search and filter capabilities for quick lookup during programming and debugging.

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Start Using ASCII Table Reference Today

ASCII is the bedrock of every text-based protocol and file format on the internet. Whether you're debugging a network stream, writing a parser, or looking up the HTML entity for a special character, having a complete ASCII reference with all representations in one place saves time and eliminates conversion errors. Bookmark this table and search it the next time you encounter a numeric character code in your work.

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