ASCII Table

View ASCII character codes with decimal, hex, octal, and binary values.

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Input
Output
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About ascii table

ASCII Table works entirely in the browser tab. Open it, use it, close it. Nothing about the session outlives the page.

The page holds your input in memory and nowhere else. No cookie stores it, no request sends it, and a reload wipes it.

You will find it under Symbols, alongside 9 other tools for the same sort of job.

Supports printable, control, full (0-127), and extended (0-255) ranges in table or compact format.

How to use it

01
Start it
Every control is on the tool itself. Keyboard shortcuts, where there are any, are listed beside it.
02
Watch it run
It updates in the page as you go. Nothing is sent anywhere, so it keeps working with the network off.
03
Close when done
Nothing is stored between visits. Reloading gives you a clean start rather than picking up where you left off.

Examples

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…

Questions

Does ASCII Table work offline?+

Yes. It is JavaScript running in this tab, so once the page has loaded it needs nothing further from the network. Put the machine in flight mode and it carries on. Nothing you do here is sent anywhere, because there is nowhere for it to go.

Does it remember anything between visits?+

No. Reload the page and it starts from nothing. There is no account, no saved state and no cookie holding your last session. That is a deliberate trade: it cannot lose your data because it never keeps any.

Is it accurate?+

Timing comes from performance.now(), the high resolution clock the browser provides, rather than from setInterval, which drifts by a few milliseconds every tick and compounds over minutes. What can still shift things is the browser throttling a tab in the background, so leave it visible if the timing matters.

Does it make a sound?+

Where a sound makes sense, it is generated with the Web Audio API rather than loaded as a file, so there is nothing to download and nothing to block. Browsers refuse to start audio until you have interacted with the page, which is why the first press is what switches it on.

Can I use ASCII Table on a phone?+

Yes. The controls are sized for touch and the layout collapses to one column on a narrow screen. Bear in mind that a phone locking its screen will suspend the page, and timing stops with it.