ASCII Table Reference

What this tool does

This is a complete, searchable reference for the American Standard Code for Information Interchange — ASCII. It lists every one of the 128 codes from 0 to 127. For each code it shows the character (or, for non-printable codes, a short name like NUL, LF, CR, ESC or DEL), the value in decimal, hexadecimal, octal and 8-bit binary, and a plain-language description. There is nothing to convert and nothing to upload — the table is part of the page and everything runs in your browser.

Why you might need it

ASCII codes turn up constantly in real work. You might be reading a hex dump and need to know that 0x0A is a line feed, debugging why a file has stray carriage returns, writing an escape sequence, validating input character by character, or simply settling which code the tab key produces. Memorising all 128 values is pointless; having them one search away is not. The control-character section in particular is hard to find elsewhere in a clear form, and it is exactly the part people need when tracking down whitespace and line-ending bugs.

How to use it

1. Scroll the table to browse, or type in the Search box to filter it.
2. Search matches several fields at once — try a decimal number like 65, a hex value like 4a, a single character like @, or a name fragment like tab or escape.
3. Use the Group toggle to narrow the list to Control characters (0–31), Printable characters (32–126), or DEL (127).
4. Hover over any decimal, hex, octal or binary value and click the copy button to put that exact value on your clipboard.

Formats explained

Each row gives you four ways to write the same code. Decimal is the everyday base-10 number — 65 for the letter A. Hexadecimal is base-16, shown with a 0x prefix (0x41), and is what you will see in memory dumps and string escapes like \x41. Octal is base-8, padded to three digits (101), and survives in older Unix tools and in escape sequences like \101. Binary is the raw 8-bit pattern (01000001), useful when you are thinking about bit masks or how text is stored. The character column shows the glyph for printable codes and the standard abbreviation for control codes.

Common pitfalls

The classic confusion is between the two line-ending codes: LF (code 10, line feed) and CR (code 13, carriage return). Unix-style text ends lines with LF alone, Windows uses CR followed by LF, and mixing them causes the “extra blank line” or “everything on one line” problems you see in diffs. Another trap is the space at code 32 versus the tab at code 9 — both look like whitespace but are different codes, which matters for indentation rules and strict parsers. Remember too that ASCII stops at 127: any accented letter, currency symbol or emoji is a higher Unicode code point and will not appear here.

Tips and advanced use

Because the hex and binary values are one click to copy, this table doubles as a quick encoder for single characters — find the character, copy its hex, and paste it into an escape sequence. When you are debugging an invisible-character bug, filter to the Control group and scan the descriptions; the culprit is almost always CR, LF, HT (tab) or NUL. And since the reference is fully client-side, it loads instantly and works offline once the page is open — no lookups are ever sent anywhere.