How do you find the code for the Escape key without memorizing a chart? The ASCII Table Viewer lets you filter and search the full ASCII set. It lists decimal, hex, and binary values for codes 0 through 127.
This lookup is for programmers, system admins, and students. You choose a range or type a query, and the table rebuilds to match.
Table of Contents
- What the Viewer Shows
- How to Use It, Step by Step
- How the Table Is Built
- Worked Example
- How to Read the Rows
- How the Search Behaves
- Limitations and Assumptions
- FAQs About the ASCII Table Viewer
What the Viewer Shows
The tool builds a table for the range you pick, then filters it by your search text. Three cards report the filtered count, the range category, and the output format.
- Three ranges: all 0 to 127, printable 32 to 126, and control 0 to 31.
- Columns for decimal, hex, binary, and a character or name.
- Named rows for every control code from 0 to 31, such as TAB and ESC.
- A search box that finds one code by number, hex, character, or name.
- Cards labeled Filtered Characters, Range Category, and Format.
- Copy ASCII Table copies the whole table as text.
How to Use It, Step by Step
- Pick a range in the Character Range Filter dropdown.
- Or type into Quick Search Code or Character.
- Try a decimal like 65, a hex like 0x41, or a name like ESC.
- Read the matching rows in the reference chart box.
- Press Copy ASCII Table to copy the result as text.
How the Table Is Built
Each code point is turned into three forms plus a label. The tool pads the hex and binary so the columns stay even.
Dec 65=Hex 0x41=Bin 01000001=Char A
- Decimal is the code point, from 0 to 127.
- Hex is base 16, with a 0x prefix and two digits.
- Binary is base 2, padded to eight digits.
- The last column shows the glyph, or a control-code name.
- Every control code from 0 to 31 carries a readable name.
Worked Example
Leave the range on All Standard ASCII and a few rows read like this.
| Dec | Hex | Binary | Character |
|---|
| 5 | 0x05 | 00000101 | ENQ (Enquiry) |
| 9 | 0x09 | 00001001 | TAB (Horizontal Tab) |
| 10 | 0x0A | 00001010 | LF (Line Feed) |
| 32 | 0x20 | 00100000 | SPC (Space) |
| 65 | 0x41 | 01000001 | A |
| 97 | 0x61 | 01100001 | a |
This tool has no octal column, unlike the character viewer. It focuses on decimal, hex, and binary plus a clear label.
How to Read the Rows
The decimal number is the main identifier for each code. Hex pairs appear in escape sequences and byte dumps.
The binary column spells out the eight-bit pattern. Code 5, for example, shows as ENQ, so no code is left unnamed.
Every control code from 0 to 31 now carries a short standard name. Space reads as SPC, and code 127 reads as DEL.
How the Search Behaves
The search looks for one exact match, not partial text. A decimal matches only the whole number, so 65 finds code 65.
A 0x hex value matches one code, like 0x41 for A. A single character is case sensitive, so A is 65 and a is 97.
A control name like ESC or TAB jumps to that one code. If nothing matches, a short message lists the valid forms to try.
Want an octal column too? The ASCII character viewer adds one. To decode a list of numbers into words, use the ASCII to Text converter. To build codes from text, the Text to ASCII tool does the reverse. Working from hex pairs instead? The Hex to Text converter fits that job. More options live in the developer tools hub.
Limitations and Assumptions
- It covers only standard ASCII, 0 through 127.
- Search needs an exact code, hex, character, or name.
- A search with no match shows a message, not a blank table.
- There is no octal column in this tool.
- The output is text in a box, not a clickable table.
- The copy action grabs the whole table, not one row.
FAQs About the ASCII Table Viewer
What Does the ASCII Table Viewer Show?
It shows an ASCII reference chart for the range you pick. Each row lists the decimal, hex, and binary value plus a character or name. You can copy the whole chart as text.
How Do I Search for a Specific Code?
Type one exact value in the search box. That can be a decimal like 65, a hex like 0x41, a single character, or a name like ESC. Each form finds just that one code.
Is the Character Search Case Sensitive?
Yes, a single character search is case sensitive. The letter A returns code 65, while a returns code 97. Numbers, hex values, and names are not affected.
Does the Table Include Octal Values?
No. This viewer shows decimal, hex, and binary only. For an octal column, use the ASCII character viewer instead.
Which Control Codes Have Names?
All of them from 0 to 31 do, such as NUL, BEL, and US. Space shows as SPC, and code 127 shows as DEL. No code in the chart reads as an unnamed number.
What Happens If My Search Finds Nothing?
The tool shows a short message instead of an empty chart. It suggests valid forms, like a decimal, a hex code, a character, or a control name. You can then retype your query.
This calculator gives general estimates only and is not professional advice. Reviewed for general accuracy by Prof. Dr. Khalil Mudassar, PhD.