Key Press Test

What is this tool?

Where the keyboard tester answers did this key register, the Key Press Test answers when. Every press is timed, so you get hold duration and the gap between consecutive presses rather than a simple pass mark.

The page opens on PRESS ANY KEY and starts recording as soon as it has focus. A live log builds up underneath with one row per event.

Because it reports intervals in milliseconds, it is the tool to reach for when something feels wrong but nothing is obviously broken — a key that lingers, a press that arrives twice, a rhythm that will not stay even.

How to use it

1. Press a key and hold it brieflyThe panel names the key and reports how long it stayed down. A normal deliberate tap sits somewhere around 60–120 ms.
2. Tap the same key repeatedlyNow watch the press-to-press interval. A steady hand produces a fairly steady number; a switch with a problem produces gaps that make no sense, such as 8 ms between two presses you made once.
3. Freeze the log to read itPause Monitoring stops new rows arriving so a fast sequence stays put. Clear empties the log, Reset starts a clean session with the counters back to zero.
4. Compare across keysRun the same short sequence on a key you trust and on the key you suspect. The difference between the two is far more informative than either number on its own.

What the results mean

Hold duration

Time between keydown and keyup for one press. It measures your finger, not the switch — but a hold you cannot end, or one that reports far longer than you held it, points at a release problem.

Press-to-press interval

Time between one press and the next. Intervals in the low single-digit milliseconds are faster than a human hand can move and are the signature of chatter rather than of skill.

Press frequency

How often the key is firing over the session. Useful for spotting a key that is reporting when you are not touching it.

Auto-repeat rows

Holding a key produces repeat events from the operating system. They appear in the log so you can recognise them, and they are not evidence of a fault.

What it can detect

• How long each key was held, in milliseconds
• The interval between consecutive presses of the same key
• Impossibly short intervals, which is what chatter looks like in timing data
• Presses arriving when you are not touching the keyboard

Limits worth knowing

A browser can only report what the platform gives it. These are the honest boundaries of this page, so a result is never read as more than it is.

• Timings are taken when the browser receives the event. They include operating-system and browser scheduling, so they are not a measurement of switch or cable latency.
• This page reports what it sees; it does not judge. A short interval is a strong hint of chatter, but the Double-Click Test is the tool that applies a threshold and calls it.
• It cannot test keys the operating system reserves, and the Fn key on most laptops never produces an event at all.

Tips

• Test one key at a time. Mixing keys makes the interval column meaningless because it is measuring the gap between different keys.
• If you are chasing an intermittent fault, leave the page open and keep working in it for a while — the log is what catches something that happens once a minute.
• For a verdict rather than raw numbers, take the same key to the Double-Click Test and set a threshold.

Troubleshooting

Related documentation

• KeyboardKeyboard Double-Click TestApplies a millisecond threshold to press-to-press timing and calls out chatter.
• KeyboardStuck Key DetectorWatches for keys that go down and never come back up, with an adjustable hold threshold.
• KeyboardBroken Key DetectorA guided pass over every physical key, plus a consistency re-test for the ones that look wrong.
• KeyboardKey Event TesterA live inspector for event.key, event.code, location, repeat and modifier state — built for developers.
• KeyboardRapid Trigger TestTimes the full press-release-press cycle over five seconds and isolates the reset gap.