Keyboard Latency Test
Measure your keyboard input lag and response time right in the browser.
The amber bar lags the green input bar — the gap is an illustration of input lag.
Hardware note:browser-based tests cannot read your keyboard's true hardware scan rate or total system latency. These numbers show event-processing delay measured in the browser, and the operating system controls key auto-repeat. Use them to compare relative responsiveness, not as absolute hardware figures.
This free online keyboard latency test measures the input lag between your keyboard and the browser across three modes — Visual Lag, Event Timing, and Key Latency. Track live processing lag, jitter, consistency, sample count, and an effective event rate, then compare your result against competitive-gaming benchmarks.
Latency is one fault — chatter is another. Check your keys for unwanted double presses with the Keyboard Double-Click Test.Keyboard Latency Test Guide
What Is Keyboard Latency?
Keyboard latency (input lag) is the delay between physically pressing a key and that press being acted on. It is measured in milliseconds (ms) and determines how responsive your keyboard feels. Lower latency means faster response — important for competitive gaming, fast typing, and rhythm games. This browser tool measures the slice of that delay it can see: the time between an input event being stamped by your system and the page processing it.
What Affects Keyboard Latency?
- • Connection: wired USB is generally faster and more consistent than wireless, and a 1000 Hz gaming keyboard reports more often than a standard one.
- • Switch & debounce: the switch type and the keyboard's debounce delay add a few milliseconds before a press is registered.
- • OS processing: background processes, drivers, and power-saving modes all add delay.
- • Browser: different browsers schedule and process input events at different speeds.
Test Modes Explained
- • Visual Lag: a trailing amber bar lags the green “input” bar — the gap is an illustration of input lag, while the readout shows real event-processing delay.
- • Event Timing: graphs the time between key events. Hold a key down for a steady stream; the tool derives an effective event rate from the interval.
- • Key Latency: measures the processing time for each individual press and plots a histogram of the latencies you record.
Latency Benchmarks
| Latency | Rating |
|---|---|
| < 2 ms | Professional gaming level |
| 2–5 ms | Great for competitive play |
| 5–10 ms | Acceptable for most users |
| 10–20 ms | Noticeable lag in fast games |
| > 20 ms | May affect timing-sensitive play |
How to Reduce Keyboard Latency
- • Use a wired connection or a low-latency 1000 Hz gaming keyboard instead of a slow wireless link.
- • Connect directly to a USB port and avoid hubs, extenders, and front-panel headers.
- • Update keyboard firmware and drivers from the manufacturer, and lower the debounce delay if your keyboard allows it.
- • Close unnecessary background applications and browser tabs that compete for CPU time.
- • Disable power-saving for USB devices so the keyboard is never throttled.
Browser Limitations
Browser-based tests have inherent limitations compared with dedicated hardware measurement tools:
- • They cannot read your keyboard's true hardware scan rate — the effective rate is estimated from event timestamps.
- • Held keys report the operating system's auto-repeat rate, which is not the same as the hardware scan rate.
- • Results vary based on your browser, operating system, and overall system load.
Frequently Asked Questions
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