About KeyTest
KeyTest is a collection of free, browser-based testing tools at keytest.info. Check your keyboard, mouse, microphone, and game controller in seconds — no downloads, no sign-up, and nothing leaves your device.
What is KeyTest?
KeyTest is a suite of small, focused diagnostic tools that run entirely in your web browser. Each tool visually shows the inputs your computer is receiving — every key you press, every mouse button you click, every sound your mic picks up, and every button on your game controller — so you can confirm in seconds whether your hardware is working correctly.
The tools are designed to be useful for everyone: people checking a new purchase before the return window closes, gamers verifying anti-ghosting and controller inputs, remote workers troubleshooting their mic before a call, and anyone diagnosing a faulty peripheral.
There's no installation, no account, and no learning curve. Open a page, start using your device, and see what's happening live.
Our Tools
Keyboard Tester
Visually check every key on your keyboard — function keys, numpad, modifiers, and media keys. Includes N-key rollover and anti-ghosting checks.
Mouse Tester
Test left, right, middle, and side buttons, scroll wheel, double-click reliability, polling rate, and DPI behavior — all in your browser.
Mic Tester
Check that your microphone is detected and capturing sound, view a live waveform, and confirm input levels before any meeting or recording.
Controller Tester
Test gamepads and game controllers — every button, trigger, analog stick, and D-pad direction — directly in the browser using the Gamepad API.
Why KeyTest?
Instant Response
Zero-latency input detection using native browser APIs. See each press, click, or sound register the moment it happens.
Detailed Statistics
Track exactly which inputs you have tested, total event counts, and what is still untested. Everything updates live.
100% Private
All processing happens locally in your browser. No keystrokes, mouse data, or audio is ever sent to a server.
Works Everywhere
Runs in any modern desktop or mobile browser. No installation, no sign-up. Works on Windows, macOS, Linux, and ChromeOS.
Free Forever
Every tool on KeyTest is completely free to use, with no paywalls, no ads inside the testers, and no usage limits.
Built for Real Problems
Designed to help you quickly diagnose hardware issues, verify a new purchase, or troubleshoot before a return window closes.
When to use KeyTest
- Verifying a brand-new keyboard, mouse, headset, or controller before the return window closes.
- Diagnosing stuck, chattering, double-clicking, or unresponsive inputs on existing hardware.
- Testing gaming keyboards for anti-ghosting and N-key rollover, or mice for polling rate and DPI behavior.
- Checking that your microphone works and is at the right input level before a meeting, stream, or recording.
- Confirming a gamepad's buttons, triggers, and analog sticks are all reading correctly.
- Quickly checking peripherals after a driver update, firmware change, cleaning, or repair.
Privacy
Every KeyTest tool runs entirely inside your browser. Keystrokes, mouse activity, microphone audio, and controller input are processed locally with standard browser APIs and never sent to any server. There is no backend, no account system, and no analytics inside the testers themselves. Your data stays on your device.
About the Author
Suraj Paul
Creator of KeyTest · keytest.info
Honestly, I'm not a developer at all. One day my keyboard started doing weird things — some keys weren't registering, others felt off. I just wanted a quick way to check what was working and what wasn't. Simple enough, right?
Turns out, not really. Everything I found online was either covered in ads, wanted me to install something, or just looked sketchy. I gave up and thought — someone should just make a clean, free tool for this. Then I figured, why not me?
That's how KeyTest started. It began as a keyboard tester I built for myself, and over time it grew into a small set of tools for the other peripherals people deal with every day — mice, microphones, and controllers. All free, all private, for anyone in the same situation.
Ready to test your hardware?