Key Latency / Input Lag Test
Free keyboard latency test online. Measure your keyboard's input lag and response time in milliseconds. Check if your keyboard has delay before you game.
keyboard tester
press any key on your keyboard to test if it works.
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Keyboard Latency Test — Measure Your Keyboard Input Lag
Check performance hardware specs, optimize key inputs, and verify your configurations in real-time with our free tools.
What Is Keyboard Latency?
Keyboard latency is the delay between pressing a physical key and the action registering on your screen. Running a keyboard latency test measures this delay in milliseconds, helping you check your input lag.
How to Use the Keyboard Latency Test
To use the latency checker, press any key repeatedly. The tool measures the time elapsed between keydown and keyup events to estimate your keyboard's response time and display average latency values.
What Is a Good Keyboard Response Time?
A lower response time is critical for competitive gaming, while office typing can tolerate higher latency. Refer to these benchmarks:
Latency Benchmarks Table (Excellent / Good / Poor)
Under 5ms is considered excellent (gaming standard). 5ms to 15ms is good (standard office). Over 25ms is poor (noticeable input lag).
What Causes Keyboard Input Lag?
If your keyboard latency is high, it is usually caused by one of three main factors:
Wireless Interference
2.4GHz wireless or Bluetooth keyboards can experience interference from other devices, causing delay.
USB Polling Rate
Keyboards with low polling rates (like 125Hz) update your PC less frequently, leading to higher latency.
Software and Driver Overhead
Corrupted keyboard drivers or background software can delay input processing.
How to Reduce Keyboard Latency
Use a wired USB connection instead of Bluetooth, increase your polling rate to 1000Hz if supported, and close background applications.
Wired vs Wireless Keyboard Latency — Real Difference?
Modern 2.4GHz wireless gaming keyboards have latency identical to wired models, while standard Bluetooth keyboards can have over 30ms of lag.
Frequently Asked Questions
What is keyboard input lag?
It is the delay between pressing a key and the keypress registering on the screen, measured in milliseconds.
What is a good keyboard latency in milliseconds?
A latency under 5ms is ideal for gaming, while under 15ms is perfectly fine for standard typing.
Does wireless keyboard have more lag than wired?
Bluetooth keyboards have noticeable lag. High-end 2.4GHz wireless gaming keyboards have virtually zero lag, matching wired performance.
How do I fix keyboard input delay?
Switch to a wired connection, update your keyboard drivers, or adjust the USB polling rate in your keyboard's software.