How to read a key's values

Press a key in the field and the page shows four things about that one press: the key value, the physical code, the legacy keyCode and any modifiers that were held. Values are read by the page itself, so nothing is sent anywhere and the reading works offline.

The four tables below list the legacy keyCode each key reports in current Chrome on Windows. They are a reference for reading old code, not a recommendation: keyCode is deprecated, and event.key and event.code answer most of what keyCode was once used for.

Click the field, then press a single key. The badge fills with the keyCode and the table above it fills with the key value, the code value and the modifiers that were down.
Release everything before the next key, so the modifiers row stays readable. The field empties itself after each press; use Clear if you want to start over.
Check the visible legacy value against the tables below. A key that is not listed still reports a value in the badge.
For old code, compare keyCode with key and code before replacing it, since arrows, punctuation and modifiers are reported differently from each other.

What the tables are, and where the numbers come from

What each value means

key is the character or the name of the key, and it follows your layout and modifiers: the same physical key is a, A or ä depending on Shift and on the keyboard layout. code is the physical position on a standard US layout, so KeyA stays KeyA whichever character it produces. keyCode is the legacy number this page was built around, and the badge shows it next to the other two.

Modifiers are reported separately as Shift, Ctrl, Alt and Meta, and they describe the state at the moment of the press. Pressing Shift by itself reports Shift with keyCode 16 and code ShiftLeft or ShiftRight, so left and right copies of a modifier can be told apart through code even though keyCode does not separate them.

How the tables were checked

Every value in the four tables was compared against real presses in current Chrome on Windows. Letters and digits report their uppercase ASCII value: A is 65 and 0 is 48, with no difference between the shifted and unshifted form. Function keys run 112 to 123. Punctuation reports the unshifted US character, so ; and : both report 186.

Control keys, arrow keys, the function row and the multimedia keys were all verified the same way. The rows for Print Screen, Scroll Lock, Pause, the Windows keys and the context menu key were absent from the older version of this table; they are listed here because they do report keyCodes on Windows.

The numeric keypad depends on Num Lock

The keypad table lists the values a keypad key reports when Num Lock is on: 0 through 9 are 96 to 105, and the operators are * 106, + 107, - 109, . 110 and / 111. With Num Lock off the same physical keys become navigation keys and report the navigation keyCodes instead — 0 becomes Insert, 1 becomes End, 2 becomes ArrowDown, 5 becomes Clear with value 12, and the decimal key becomes Delete.

Two entries collide with the main keyboard in that state: the keypad Enter reports 13 like the main Enter, and the keypad decimal reports 46 like Delete. The code value still separates them, NumpadEnter and NumpadDecimal against Enter and Delete, and that is the reason code is shown next to keyCode rather than instead of it.

What the tool cannot see

A web page only receives what the browser decides to send. Print Screen fires a keydown and usually no keyup, so it appears in the badge and then stays there until the next press. The Fn key on a laptop keyboard, volume and brightness keys that the operating system handles itself, and the Copilot key report nothing at all.

Focus matters as well: the field has to be active for a press to be read, and a key pressed while the window is in the background is never delivered to the page. Please test one key at a time.

Legacy keyCode values for letter and number keys
Key	keyCode	Key	keyCode	Key	keyCode	Key	keyCode
A	65	J	74	S	83	1	49
B	66	K	75	T	84	2	50
C	67	L	76	U	85	3	51
D	68	M	77	V	86	4	52
E	69	N	78	W	87	5	53
F	70	O	79	X	88	6	54
G	71	P	80	Y	89	7	55
H	72	Q	81	Z	90	8	56
I	73	R	82	0	48	9	57

Legacy keyCode values for numeric keypad keys				Function key values (keyCode)
Key	keyCode	Key	keyCode	Key	keyCode	Key	keyCode
0	96	8	104	F1	112	F7	118
1	97	9	105	F2	113	F8	119
2	98	*	106	F3	114	F9	120
3	99	+	107	F4	115	F10	121
4	100	Enter	13	F5	116	F11	122
5	101	-	109	F6	117	F12	123
6	102	.	110
7	103	/	111

Control key values (keyCode)
Key	keyCode	Key	keyCode	Key	keyCode	Key	keyCode
BackSpace	8	Esc	27	Right Arrow	39	-_	189
Tab	9	Spacebar	32	Down Arrow	40	.>	190
Clear	12	Page Up	33	Insert	45	/?	191
Enter	13	Page Down	34	Delete	46	`~	192
Shift	16	End	35	Num Lock	144	[{	219
Control	17	Home	36	;:	186	\\|	220
Alt	18	Left Arrow	37	=+	187	]}	221
Caps Lock	20	Up Arrow	38	,<	188	'"	222
Print Screen	44	Scroll Lock	145	Pause	19	Windows / Command	91
Right Windows / Command	92	Context menu	93

Multimedia key values (keyCode)
Key	keyCode	Key	keyCode	Key	keyCode	Key	keyCode
Volume up	175
Volume down	174
Stop	179
Mute	173
Browser / Home	172
Mail	180
Search keys	170
Collection	171