View ASCII character codes with decimal, hex, octal

Look up seven-bit ASCII positions in decimal, hexadecimal, octal, binary, and named control form.

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ToolASCII Table
Input
Output
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Preview

How it works

Each selected integer is rendered in four bases, controls receive abbreviations, and printable codes 32–126 show their glyphs. Standard mode ends at 127; the optional 128–255 display is an ISO-8859-1-style JavaScript extension, not ASCII.

  • Printable mode is selected first so invisible controls do not crowd the everyday reference range.
  • Binary values are padded to eight positions for byte readability even though ASCII itself uses seven bits.

Worked example

Printable Characters
Display the printable ASCII character table (codes 32-126)
Input
											Range: printable
Format: compact
Output
												Dec  Hex  Oct  Char
---  ---  ---  ----
 32  0x20  040   
 33  0x21  041  !
 34  0x22  042  "
 35  0x23  043  #
 36  0x24  044  $
 37  0x25  045  %
 38  0x26  046  &
 39  0x27  047  '
 40  0x28  050  (
 41  0x29  051  )
 42  0x2A  052  *
 43  0x2B  053  +
 44  0x2C  054  ,
 45  0x2D  055  -
 46  0x2E  056  .
 47  0x2F  057  /
 48  0x30  060  0
 49  0x31  061  1
 50  0x32  062  2
 51  0x33  063  3
 52  0x34  064  4
 53  0x35  065  5
 54  0x36  066  6
 55  0x37  067  7
 56  0x38  070  8
 57  0x39  071  9
 58  0x3A  072  :
 59  0x3B  073  ;
 60  0x3C  074  <
 61  0x3D  075  =
 62  0x3E  076  >
 63  0x3F  077  ?
 64  0x40  100  @
 65  0x41  101  A
 66  0x42  102  B
 67  0x43  103  C
 68  0x44  1…

When to use this

Protocol debugging converts hexadecimal delimiters, programming lessons inspect digit and letter codes, and terminal investigations identify CR, LF, TAB, ESC, and DEL.

Edge cases

  • Code 10 is labelled LF rather than inserting a real line break into its table cell.
  • Positions 128–255 remain outside ASCII even when the optional extension displays them.
  • Code 127 is DEL and not a printable glyph despite sitting above the printable 32–126 range.

References