Some keys don’t work, stick or type the wrong character
Test: Keyboard Tester → Guide: Why laptop keyboards stop working
Free hardware tests · no downloads
Find out what’s wrong with your laptop or PC in minutes
Test your keyboard, camera, microphone, speakers, screen and more right here in your browser — then follow a plain-English guide to fix what you find.
- Runs locally — nothing you type, say or show on camera is uploaded
- Honest about what a browser can and can’t measure
- 38 fix guides written alongside the tools
Start here
What’s the problem?
Most hardware problems turn out to be a setting, a driver or the wrong device selected. Test the hardware outside the app that’s misbehaving, then follow the guide.
My camera works in one app but not in Teams or Zoom
Test: Webcam Tester → Guide: Camera not working in Teams or Zoom
People on calls can’t hear me, or say I’m too quiet
Test: Microphone Tester → Guide: Microphone not working: quick fixes
No sound, or sound from only one side
Test: Sound Tester → Guide: Headphones only working on one side
My Wi-Fi or broadband feels slow
There’s a dot on my screen that won’t go away
Test: Screen & Dead Pixel Test → Guide: Dead pixel vs stuck pixel
Is my new monitor really running at 144 Hz?
Test: Refresh Rate Test → Guide: How to test a monitor online
My laptop gets hot and slows down under load
My mouse double-clicks when I click once
Test: Mouse & Touchpad Test → Guide: Mouse double-clicking on its own
I’m about to buy a second-hand laptop
Test: Used Laptop Checkup → Guide: Used laptop buying checklist
Nothing matches that yet — try the search box at the top, which covers every tool and guide.
All tools
15 free tests, all in your browserInput
Keyboard Tester
Press every key and see which ones register, stick or repeat, on a Windows UK or Mac layout.
Mouse & Touchpad Test
Check pointer movement, left and right clicks, double-clicks and scrolling from a mouse or touchpad.
Typing Speed Test
Measure net words per minute and accuracy over 15 seconds to 2 minutes.
Reaction Time Test
Five rounds with false-start detection, measuring your average and best reaction in milliseconds.
Camera & audio
Webcam Tester
See a live preview, switch cameras and confirm resolution before a call or interview.
Microphone Tester
Watch a live level meter to confirm your mic works and is loud enough, and pick the right input.
Sound Tester
Play left, right, bass and treble tones to find a dead speaker, a one-sided headset or distortion.
Display
Screen & Dead Pixel Test
Full-screen colours, gradients and grids for spotting dead pixels, banding and backlight bleed.
Refresh Rate Test
Check your monitor is really running at 60, 120, 144 Hz or more, and how smoothly frames arrive.
Performance & system
CPU Benchmark
Single- and multi-core scores, a 1–90 minute throttling stress test and a public leaderboard.
GPU Benchmark
An adaptive WebGL load that finds your graphics limit, with a stress test and leaderboard.
System Info
See the screen, browser, memory and processor details your browser can detect — handy for support requests.
Network & utilities
Internet Speed Test
Measure ping, download and upload speed, and see what the numbers mean for calls and streaming.
Used Laptop Checkup
A guided 12-step inspection for buying second-hand, with a report you can export.
Timer
A full-screen timer that keeps the display awake — for presentations, workshops and study sessions.
Latest guides
All 38 guides →
Internet Speed Test Results Explained: What Is Actually Good?
Ping, download, upload, jitter — what each number means, what "good" looks like for your use case, and when to complain to your ISP.
WiFi Slow on One Laptop Only? 9 Fixes That Work
When the WiFi is fine everywhere except one machine, the fault is in that machine. Work through the nine usual suspects in order.
Upload Speed Too Slow for Video Calls? Here Is How to Fix It
Video calls need upload, not download. What your meeting apps actually require, how to measure it, and practical ways to free it up.
Keyboard Typing Double Letters? How to Fix Key Chatter
One press, two letters: how to prove chatter with an event history test, and the fixes — from debounce settings to switch cleaning.
Keyboard Ghosting and Key Rollover Explained (With a Live Test)
Why W+A+Space works but W+A+E does not: the keyboard matrix, what N-key rollover buys you, and a two-minute browser test.
Dead Pixel vs Stuck Pixel: The Difference and What You Can Do
A dead pixel stays black; a stuck pixel glows one colour. How to tell them apart with fullscreen tests, and honest odds of a fix.
How the tests work — and what they can’t do
Private by design
Keyboard, camera, microphone and screen tests run entirely in your browser. Nothing you type, say or show is uploaded.
Hardware or settings?
If something works here but not in one app, the hardware is fine and the fix is in that app’s settings. Each tool links to the guide for the next step.
Honest limits
Browsers can’t read battery cycles, SSD health or temperatures. We say so on each tool and point to the operating-system tools that can.
Visitors have submitted 85 CPU benchmark results to our public leaderboard, which we use to calibrate the score ratings. More about who runs TestMyPC →