ASCII Table Lookup

What Is the ASCII Table Lookup?

ASCII (American Standard Code for Information Interchange) assigns each printable character a number from 32-126. This tool shows the complete printable ASCII table with each character's decimal, hex, octal, and binary value, plus a quick single-character lookup.

How to Use This Tool

Type a single character into the lookup field for its exact values, or scroll the full reference table below.

Understanding the ASCII Range

Practical Uses

• Quickly looking up a character's decimal or hex code for use in code
• Cross-referencing ASCII values while debugging character-encoding issues
• Learning the ASCII table's structure and character ordering

For converting a full string (not a single character) to hex or binary, see the Text to Hex Converter or Text to Binary Converter.

Reading a Lookup Result

The lookup box holds one character. It starts with A, which shows decimal 65, hex 41 and binary 01000001. Hex digits are shown in upper case, and the binary value is padded with zeros to at least 8 digits. The octal value appears in the full table below (A is 101 in octal). Type a different character, and the three tiles update immediately. Use the copy button to copy a short summary, or the download button to save the full table as tab-separated text that opens neatly in a spreadsheet.

Patterns Worth Noticing

• Digits 0 to 9 occupy codes 48 to 57, so a digit character minus 48 gives its numeric value.
• Uppercase letters run from 65 (A) to 90 (Z), and lowercase from 97 (a) to 122 (z).
• Each lowercase letter is exactly 32 higher than its uppercase partner: A is 65 and a is 97. In binary this is just the sixth bit, which is why case can be toggled by flipping a single bit.
• The space is code 32 (hex 20), and the tilde is the last printable code at 126 (hex 7E).
• Punctuation is scattered in gaps between these groups, for instance from 58 to 64 between the digits and the capital letters.

Worked Example: Checking a Character Range

Suppose you are writing a form check that accepts only uppercase letters. Look up A and Z to see 65 and 90, then test that a character's code falls within that range. Look up the neighbours, such as the at sign at 64 and the opening bracket at 91, to confirm they lie outside it. This kind of quick lookup prevents off-by-one mistakes when working with character codes.

Characters Outside the Printable Range

The table covers only codes 32 to 126. Control characters such as tab (9), line feed (10) and carriage return (13) are not listed. The lookup box does accept any single character, though. An accented letter like é returns its numeric code (233), and the euro sign returns 8364, which is more than the 8 bits the padding assumes, so its binary value is longer. These are Unicode code units, not ASCII values, so treat them as reference only. A single emoji or other character outside the basic multilingual range is stored as two code units, and the one-character box can only hold the first half of it, so the result is not meaningful.

When You Need a Whole String

This tool is a one-character reference. To convert a full word or sentence, use a text to hex or text to binary converter, which applies the same numbering to every character. Bear in mind that a code table lookup gives the value, not the bytes stored in a particular file, which depend on the encoding used.

Frequently Asked Questions