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Dec	Hex	Oct	Bin	Char	HTML	Description	keyCode

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About

JavaScript's KeyboardEvent.keyCode property was deprecated in favor of KeyboardEvent.key and KeyboardEvent.code, yet legacy codebases and interview questions still reference numeric keycodes daily. Confusing charCode (from charCodeAt) with keyCode (from KeyboardEvent) causes silent bugs in form validation, game input handlers, and accessibility layers. This tool maps every ASCII character in the range 0 - 127 to its decimal code point, hexadecimal value, and HTML entity. It also captures live keypresses so you can verify the actual keyCode, key, and code values your browser emits.

Note: keyCode values for printable characters often match the uppercase ASCII code point (e.g., both 65 for "a" and "A"), while charCodeAt distinguishes case. This tool shows both mappings. Results assume a standard US QWERTY layout. Non-ASCII input is rejected and flagged with the offending character's code point.

Formulas

The ASCII code point of any character is obtained via the JavaScript method:

codePoint = charCodeAt(index)

where codePoint is an integer in the range [0, 127] for standard ASCII. The hexadecimal representation is computed as:

hex = toString(16)

The reverse operation reconstructs the character:

char = String.fromCharCode(codePoint)

For legacy KeyboardEvent.keyCode values, letters always map to their uppercase ASCII code point regardless of shift state. The relationship is:

keyCode("a") = keyCode("A") = 65

Digits map directly: keyCode("0") = 48 through keyCode("9") = 57. Punctuation keycodes are browser-dependent and derived from the physical key position on a US QWERTY layout, not from the character's ASCII value. The HTML entity format follows the pattern &#codePoint; for any numeric reference.

Reference Data

Dec	Hex	Char	HTML Entity	Description	JS keyCode	Category
0	0x00	NUL	�	Null	-	Control
8	0x08	BS		Backspace	8	Control
9	0x09	HT		Horizontal Tab	9	Control
10	0x0A	LF		Line Feed	-	Control
13	0x0D	CR		Carriage Return	13	Control
27	0x1B	ESC		Escape	27	Control
32	0x20	SP		Space	32	Whitespace
33	0x21	!	!	Exclamation Mark	49	Punctuation
34	0x22	"	"	Double Quote	222	Punctuation
35	0x23	#	#	Hash / Number Sign	51	Punctuation
36	0x24	$	$	Dollar Sign	52	Punctuation
37	0x25	%	%	Percent	53	Punctuation
38	0x26	&	&	Ampersand	55	Punctuation
39	0x27	'	'	Single Quote / Apostrophe	222	Punctuation
40	0x28	(	(	Left Parenthesis	57	Punctuation
42	0x2A	*	*	Asterisk	56	Punctuation
43	0x2B	+	+	Plus Sign	187	Punctuation
44	0x2C	,	,	Comma	188	Punctuation
45	0x2D	-	-	Hyphen / Minus	189	Punctuation
46	0x2E	.	.	Period / Full Stop	190	Punctuation
47	0x2F	/	/	Slash	191	Punctuation
48 - 57	0x30 - 0x39	0-9	0 - 9	Digits Zero through Nine	48 - 57	Digit
59	0x3B	;	;	Semicolon	186	Punctuation
60	0x3C	<	<	Less Than	188	Punctuation
61	0x3D	=	=	Equals Sign	187	Punctuation
62	0x3E	>	>	Greater Than	190	Punctuation
63	0x3F	?	?	Question Mark	191	Punctuation
64	0x40	@	@	At Sign	50	Punctuation
65 - 90	0x41 - 0x5A	A - Z	A - Z	Uppercase Letters	65 - 90	Letter
91	0x5B	[	[	Left Square Bracket	219	Punctuation
92	0x5C	\	\	Backslash	220	Punctuation
93	0x5D	]	]	Right Square Bracket	221	Punctuation
95	0x5F	_	_	Underscore	189	Punctuation
96	0x60	`	`	Backtick / Grave Accent	192	Punctuation
97 - 122	0x61 - 0x7A	a - z	a - z	Lowercase Letters	65 - 90	Letter
123	0x7B	{	{	Left Curly Brace	219	Punctuation
124	0x7C	\|	\|	Vertical Bar / Pipe	220	Punctuation
125	0x7D	}	}	Right Curly Brace	221	Punctuation
126	0x7E	~	~	Tilde	192	Punctuation
127	0x7F	DEL		Delete	46	Control

Frequently Asked Questions

The deprecated KeyboardEvent.keyCode property represents the physical key, not the character produced. Both "a" and "A" are generated by the same physical key, so both return keyCode 65 (the uppercase ASCII value). To distinguish case, use KeyboardEvent.key which returns the actual character ('a' vs 'A'), or check the shiftKey modifier property.

All three are deprecated. keyCode was set on keydown/keyup and indicated the physical key. charCode was set on the keypress event and represented the Unicode value of the character. event.which was a cross-browser normalization that returned whichever of the two was available. Modern code should use KeyboardEvent.key (the string character) and KeyboardEvent.code (the physical key identifier like 'KeyA').

Keycodes for punctuation map to the physical key position on a US QWERTY keyboard, not to the character's ASCII code point. For example, the semicolon character has ASCII code 59, but keyCode 186, because the browser identifies the physical key, not the output glyph. This mapping varies across keyboard layouts and browsers. Chrome and Firefox historically disagreed on several punctuation keycodes.

This tool covers the standard 7-bit ASCII range (0-127). Characters above 127 fall into Extended ASCII (128-255, encoding-dependent) or Unicode. For Unicode, use codePointAt() instead of charCodeAt() to correctly handle surrogate pairs (emoji, CJK characters). The keyCode property does not reliably represent Unicode characters beyond the basic Latin set.

Most control characters (NUL, SOH, STX, etc.) are relics of teletype communication. However, several remain critical: HT (9, Tab), LF (10, newline in Unix/macOS), CR (13, Enter key and part of Windows CRLF line endings), ESC (27, closing modals/menus), and BS (8, Backspace). Web applications routinely intercept keycodes 9, 13, 27, and 8 for navigation and form handling.

Yes. The live capture panel reports the keyCode, key, and code for any key press including modifiers. Ctrl alone returns keyCode 17, Shift returns 16, Alt returns 18, and Meta (Cmd/Win) returns 91. Combinations like Ctrl+A will show keyCode 65 for the "A" key with the ctrlKey modifier flag set to true. Some browser shortcuts (Ctrl+W, Ctrl+T) may be intercepted by the browser before reaching the page.