Skip to main content
FreeOnlineInstant ResultsRuns Locally
Keyboard Diagnostics

Key Press Test

Test keyboard keys, monitor key presses, and analyze your keyboard timing and rollover in real time.

Status:READY TO TESTLast Key:—Key Code:—Press Count:0
Press Stage · Live
SPACEBARSpace

PRESS ANY KEY

Press any physical key on your keyboard to begin monitoring keydown and keyup events.

READY TO TEST
Press Timeline
Recent press interval timeline will appear here
Virtual Keyboard VisualizerSynchronized with physical keystrokes
ESC
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
`
1
2
3
4
5
6
7
8
9
0
-
=
BKSP
TAB
Q
W
E
R
T
Y
U
I
O
P
[
]
\
CAPS
A
S
D
F
G
H
J
K
L
;
'
ENTER
SHIFT
Z
X
C
V
B
N
M
,
.
/
SHIFT
CTRL
WIN
ALT
SPACEBAR
ALT
CTRL
◄
▲
▼
►
Key Statistics & Frequency
Most Pressed Key—
Fastest KeySPACEBAR
Fastest Interval—
Average Interval—
KEYPRESSESAVG INTERVALLAST PRESS
No keys have been pressed yet
Input Diagnostics
Current Key:—
Current Event:—
Physical Key:—
Repeat:No
Hold:—
Interval:—
Session
Started:—
Duration:0s
Total Events:0
Physical Presses:0
Auto-Repeat:0
Keys Used:0
How To Use
  1. 1Press any physical key — the press stage lights up and every keystroke is measured.
  2. 2Click Select Key and press a key to focus the frequency tracker on that key.
  3. 3Hold keys or press several at once to measure hold duration and multi-key rollover.
  4. 4Tune the rapid-press threshold and log size in Settings, then press Reset for a fresh session.

Related Tools

Online Keyboard TesterTest every key, rollover & switch chatter in real timeKey Event TesterInspect raw keyboard event codes and propertiesBroken Key DetectorIdentify non-responsive or faulty keyboard keysStuck Key DetectorDetect physically stuck or continuously held keysAnti-Ghosting TestVerify simultaneous key press detection accuracy

Key Press Test Guide

Learn how keyboard key presses are detected, measured and visualized directly in your browser.

Overview

What is a Key Press Test?

A key press test monitors keyboard events generated by your operating system and web browser in real time. It confirms whether individual keys register reliably, tracks simultaneous multi-key combinations, and measures microsecond timing cadence.

While browser-based testing cannot directly inspect physical switch contacts, actuation spring force, or internal firmware debounce circuitry, observing browser event streams provides an accurate, non-invasive benchmark for typing rhythm and key health.

Step-By-Step

How to Use

  1. 01Choose a Key — Click 'Select Key' to focus on a specific key (e.g. Spacebar, W, Shift) or simply press any physical key on your keyboard.
  2. 02Press & Release — Tap or hold keys. The live visualizer highlights active keys, measures actuation hold duration, and tracks press-to-press intervals.
  3. 03Watch Live Statistics — Observe real-time presses per second, high-resolution microsecond intervals, rollover concurrency, and auto-repeat filtration.
  4. 04Review Timing & History — Inspect the chronological event log, recent press interval timeline, frequency rankings, and diagnostic signal details.
Metrics

What Does It Measure?

Key Press CountACCURACY

Calculates total physical key strikes while intelligently ignoring operating system auto-repeat hold signals.

Press FrequencySPEED

Live calculation of presses per second (CPS) across elapsed session time using high-resolution performance timers.

Hold DurationTIMING

Measures precise milliseconds elapsed between physical keydown and corresponding keyup releases.

Press IntervalCADENCE

Measures interval between consecutive physical keydown events to analyze single-key tap cadence and rhythm.

Simultaneous KeysROLLOVER

Detects multiple concurrent keys held down simultaneously, providing multi-key rollover (NKRO) diagnosis.

Auto-Repeat EventsDIAGNOSTIC

Distinguishes initial mechanical switch actuation from OS firmware key repetition without inflating press counts.

Technical Specifications

Understanding Browser Keyboard Events

keydown

Fires immediately when a physical key is actuated down to its electrical contact point.

keyup

Fires when the key is released above the switch reset point, allowing hold duration calculation.

event.code

Identifies the physical switch location on the keyboard regardless of language layout (e.g. KeyW).

event.repeat

Flagged by the browser when OS key repetition fires while holding down a switch. Filtered to prevent false press counts.

performance.now()

High-resolution DOMHighResTimeStamp providing sub-millisecond precision for intervals and hold timing.

Frequently Asked Questions