Free Keyboard and Mouse Latency Checker

Run a free keyboard latency test with mouse click latency mode, last-key display, jitter, consistency, best/worst samples, and browser input delay timing.

Start test Keyboard tools

Keyboard and Mouse Latency Checker

Start the test, capture key presses or mouse clicks, and compare current, average, jitter, best, and worst input-delay samples.

Input latency test

Choose keyboard or mouse mode, start the test, and repeat the same input for a clean comparison.

Status: Ready

Last input Press Start Keyboard mode is selected.

Target samples

Results

Current-- ms

Average-- ms

Best-- ms

Worst-- ms

Jitter-- ms

Consistency--

Samples0

0 / 20 samples

Press Start and then press keys to capture samples.

Related input checks

Test the rest of your input chain

Mouse Tester Check left, middle, right, and scroll input. Mouse Polling Rate Measure live mouse Hz for 125, 500, or 1000 Hz checks. Reaction Time Test Separate human reflex delay from device delay. Controller Latency Test Measure gamepad button delay, polling rate, and stick drift.

Rate Latency Checker: 2.4 (37 ratings)

Latency Checker is a free, browser-based keyboard latency test with mouse click mode, last-key display, jitter, consistency, and browser input delay samples in milliseconds.

Cost: Free, no signup
Install: None — runs in the browser
Privacy: Runs locally, no uploads
Platforms: Windows, macOS, Linux, Android, iOS
Time: Under a minute

Latency Checker guide

How to use the Latency Checker accurately

Test device and input latency in your browser

01 Open the live test Use the browser tool below without installing software or changing your current page.

02 Run one clean pass Follow the on-screen controls and keep the input steady so the result is repeatable.

03 Repeat if the result looks wrong Run the same check again before deciding whether the device, browser, or operating system is the cause.

04 Compare with related diagnostics Use the linked tools to confirm whether the same symptom appears in another hardware check.

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Latency Checker FAQ

Common latency checker questions

What is input latency?

Input latency is the delay between pressing a key or clicking a mouse and seeing the result on screen. It is the sum of device polling delay, OS processing, application handling, GPU render, and monitor refresh. Competitive gaming targets under 20 ms end-to-end.

How accurate is this browser-based latency checker?

The tool measures the time between the keydown event and the JavaScript event loop processing it, which captures OS and browser latency but not monitor or USB polling latency. Use it for relative comparisons (keyboard A vs keyboard B on the same machine), not absolute hardware specs.

What is a good keyboard latency?

Wired gaming keyboards typically measure 1-8 ms. Wireless 2.4 GHz is usually 3-10 ms. Bluetooth can spike to 30+ ms. Office-grade keyboards often report 10-20 ms under browser timing. Use the mouse click mode separately for mouse-button consistency.

Why does my wireless keyboard show higher latency?

Wireless protocols add radio-link overhead. Most 2.4 GHz gaming dongles keep the extra latency under 5 ms. Bluetooth HID runs on slotted polling and can add 10-30 ms, which is why competitive players still prefer wired.

Can this replace a dedicated latency tester?

No. Hardware testers like the Nvidia LDAT or the Logitech Latency Tool measure photon-to-event timing with microsecond accuracy. This browser tool measures a subset of the chain - useful for directional comparison rather than forensic measurement.