Free Online Laptop Hardware Tests

LaptopTestOnline is a free browser-based diagnostic suite for laptops, desktops, tablets and phones. Check your screen for dead pixels, verify every key on your keyboard, test your webcam and microphone, confirm both speakers work, measure your display's real refresh rate and analyse battery health — with no downloads, no accounts and no data leaving your device.

How our tests work

Every test runs entirely inside your browser using standard web APIs. Step one: open the tool you need. Step two: grant the browser permission if the test uses your camera, microphone or speakers. Step three: follow the on-screen instructions and read the result, then use the accompanying guidance to work out whether what you saw is a hardware fault, a driver problem, or normal behaviour for that panel or component.

This matters because most hardware faults are intermittent or subtle. A stuck pixel is invisible against a busy desktop but obvious on a solid colour field. A keyboard that drops one key only shows up when you press it deliberately. A battery that has lost a third of its capacity still reports "100%". Structured tests surface these problems in minutes instead of weeks.

Who uses LaptopTestOnline

Buyers inspecting a used or refurbished laptop before paying for it.
Sellers documenting a device honestly so their listing holds up.
Repair technicians running a pre- and post-repair baseline.
IT teams spot-checking fleet hardware at refresh time.
Owners trying to tell a hardware fault from a software one.

Our testing tools in detail

Screen Test

Our free online Screen Test cycles your display through eight solid-color fields (white, black, and the six primary/secondary hues) so you can spot dead pixels, stuck pixels, uneven backlight, and color-uniformity problems in a matter of seconds. Because the test runs full-screen in your browser, no drivers, no installs, and no permissions are required — it works on Windows laptops, MacBooks, Chromebooks, tablets, and phones alike. Whether you're inspecting a new machine, a…

Pixel Repair Tool

Stuck pixels are subpixels that are locked on a single color instead of switching correctly — they show up as tiny bright red, green, or blue dots on your display. Unlike truly dead pixels, stuck pixels can often be revived by rapidly flashing the affected area through millions of color transitions, which forces the misbehaving transistor back into normal operation. Our free browser-based Pixel Repair tool automates that process: it flashes a small region of your screen…

Color Gradient Test

The Color Gradient Test displays smooth transitions across the full brightness and hue range so you can spot color banding, posterization, and gamma issues on your display. On a healthy 8-bit or 10-bit panel, the gradient should look like an even, continuous blend from black to white or from one color to another. If you see visible steps, stripes, or sudden brightness jumps, your panel is either dithering poorly or running at a reduced color depth (often 6-bit + FRC on…

Refresh Rate Test

Your monitor's refresh rate is how many times per second it can redraw the image, measured in hertz (Hz). Standard laptops run at 60 Hz, gaming laptops at 120, 144, 165, or 240 Hz, and pro displays as high as 480 Hz. Our free Refresh Rate Test uses the browser's requestAnimationFrame API to measure exactly how many frames your display actually delivers per second — not just what the spec sheet claims. If you paid for a 144 Hz panel but Windows is only outputting 60 Hz, this…

Brightness Test

The Brightness Test steps your display through evenly-spaced luminance levels so you can spot black-crush (loss of detail in dark tones), white clipping (loss of highlight detail), and non-linear brightness curves. It also helps you calibrate a comfortable working brightness for your ambient lighting — one of the biggest causes of eye strain is a display set too bright for the room. The test runs entirely in your browser, requires no colorimeter, and works on any laptop,…

Battery Health & Test

The Battery Health tool reads your laptop's live battery data through the browser's Battery Status API and analyzes charge/discharge trends in real time to estimate battery wear, remaining runtime, and health score. It also includes an optional stress test that spikes CPU load and measures the resulting discharge rate — a much more meaningful indicator of battery capacity than a manufacturer's spec-sheet mAh number. The entire test runs client-side; no data leaves your…

Touchscreen Test

Our free online Touchscreen Test verifies that every square centimetre of your touch panel registers input accurately, tracks multi-finger gestures, and responds without lag. Because the test runs entirely in the browser, it works on Windows tablets, 2-in-1 laptops, Chromebooks, iPads, and Android devices without any driver install. In two minutes you can confirm that a new device is defect-free, diagnose dead zones on an older screen, or verify a repair before the warranty…

Mouse Test

Our online Mouse Test verifies every button, the scroll wheel, and cursor tracking in seconds. It catches the most common mouse faults — double-click errors, dead scroll wheels, unregistered side buttons, and sensor stutter — without installing anything. Whether you are testing a brand-new gaming mouse, troubleshooting an older office mouse, or verifying a warranty replacement, this test gives you a definitive answer before you spend more money.

Keyboard Test

Our free Keyboard Test highlights every key you press on an on-screen layout so you can instantly verify that every key on your laptop or external keyboard is working. It supports Windows, macOS, and international layouts and catches stuck keys, dead keys, ghosting, and n-key rollover limits without any install.

Fingerprint Sensor Test

Our Fingerprint Test uses the WebAuthn standard to trigger your device's built-in biometric authenticator — Windows Hello, Touch ID, or an Android fingerprint reader — and confirms whether the sensor recognises your enrolled fingerprint. It is a safe, industry-standard check that never sees or transmits your actual biometric data; everything stays on-device.

Microphone Test

Our online Microphone Test lets you verify your laptop's built-in mic, a USB headset, or an XLR interface without installing anything. You will see a live audio-level meter as you speak, and you can record a short clip and play it back to confirm exactly what your mic sounds like to callers and audiences.

Webcam Test

Our Webcam Test opens a live preview from any camera connected to your device — built-in laptop cam, USB webcam, or virtual camera — so you can confirm image quality, framerate, and focus before your next video call. It also displays resolution, framerate, and camera name so you know exactly what your app is streaming.

Sound Test

Our Sound Test plays generated test tones through your left and right channels, sweeps across the audible frequency range, and includes a custom frequency generator from 20 Hz to 20 kHz. Use it to verify that both speakers work, identify blown drivers, and check the frequency response of your laptop, headphones, or external speakers.

Motion Blur Test

Our Motion Blur Test animates high-contrast patterns across the screen at varying speeds so you can visually judge pixel response time, motion clarity, and ghosting on your monitor. It is the browser-based equivalent of UFO-style tests used by professional reviewers.