🔣 ASCII Table Explorer – Complete 0–255 Character Reference
The ASCII Table Explorer is an interactive reference covering all 256 characters in the ASCII standard and its ISO-8859-1 / Latin-1 extension. Whether you need to find the hexadecimal code for a control character, copy an HTML entity for a special symbol, or quickly look up the binary representation of any byte value, this tool gives you instant answers without leaving your browser.
What Is ASCII?
ASCII (American Standard Code for Information Interchange) was published in 1963 and defines a 7-bit character encoding that maps 128 unique code points (0–127) to characters universally understood by computers and communication equipment. Every modern encoding — including UTF-8 — is a superset of ASCII, making it the universal foundation of text in computing.
The Three Character Ranges
| Range | Count | Description | Examples |
|---|---|---|---|
| Control | 33 | Non-printable codes (0–31, 127) used for device control and formatting | NUL, TAB, LF, CR, ESC, DEL |
| Printable | 95 | Visible characters (32–126) including letters, digits, and punctuation | A–Z, a–z, 0–9, ! @ # $ |
| Extended | 128 | ISO-8859-1 / Latin-1 characters (128–255) for Western European languages | é, ñ, ü, ©, ®, ×, ÷ |
Numeric Representation Formats
Each character is shown in four numeric bases simultaneously:
- Decimal (Dec) — the most familiar base-10 value (e.g.,
65forA) - Hexadecimal (Hex) — base-16, widely used in programming, prefixed as
0x41 - Octal (Oct) — base-8, used in Unix file permissions and C string literals (e.g.,
\101) - Binary (Bin) — base-2, showing the raw 8-bit representation (e.g.,
01000001)
Escape Sequences for Developers
Click any row to reveal ready-to-paste escape sequences in four languages:
- C / C++ — uses
\n,\t,\x41notation - Python — uses
\n,\t,\x41or\u0041 - JavaScript / TypeScript — uses
\n,\t,\u0041 - HTML — named entities (
&,<) and numeric references (A)
Common Control Characters Quick Reference
| Dec | Hex | Abbr | Name | Use |
|---|---|---|---|---|
| 0 | 00 | NUL | Null | String terminator in C |
| 9 | 09 | HT | Horizontal Tab | Indentation in text files |
| 10 | 0A | LF | Line Feed | Unix / Linux newline |
| 13 | 0D | CR | Carriage Return | Part of Windows CRLF newline |
| 27 | 1B | ESC | Escape | ANSI terminal escape sequences |
| 32 | 20 | SP | Space | Word separator |
| 127 | 7F | DEL | Delete | Backspace on many terminals |
How to Use the Explorer
🔍 Search — Type a character, decimal code, hex value (e.g., 0x41), octal, binary string, or character name (e.g., carriage return) to instantly filter the table.
🗂️ Filter by Category — Narrow the view to only control characters, printable characters, or extended characters using the category dropdown.
🖱️ Click any row — Opens a detail panel showing all numeric codes, escape sequences, and copy buttons for every format.
🔲 Grid View — Switch to the grid layout for a visual overview of all characters, ideal for browsing printable and extended characters by appearance.
Why ASCII Still Matters
Despite Unicode's dominance, ASCII remains critical in everyday development. HTTP headers, JSON keys, email headers, and most programming language syntax are constrained to ASCII. Network protocols like SMTP, FTP, and Telnet were built entirely on it. Understanding ASCII code points is essential for debugging encoding issues, writing binary parsers, constructing regular expressions, and working with low-level systems programming in C, Go, or Rust.
The extended range (128–255) based on ISO-8859-1 is equally important for legacy systems, HTTP character set declarations, and correctly interpreting older files and databases that predate widespread Unicode adoption.