Free Screen & Device TestsOnline
Test your screen, monitor, keyboard, mouse, webcam, microphone, speakers, and game controller. No downloads. No signup.
Popular Tools
Most used diagnostic tests on DeviceKit
Dead Pixel Test
Run a free dead pixel test in fullscreen. Check monitors, laptops, phones, tablets, and TVs for dead or stuck pixels using solid color screens.
Refresh Rate Test
Measure your display's refresh rate in Hz using your browser. Check if your monitor is running at 60Hz, 120Hz, 144Hz, 240Hz, or higher.
Keyboard Test
Test every key on your keyboard in your browser. Verify that all keys register correctly on any keyboard layout.
Mouse Test
Test your mouse buttons, scroll wheel, and movement tracking in your browser. Works with any USB or Bluetooth mouse.
Webcam Test
Test your webcam in your browser. Check resolution, frame rate, and video quality without installing software.
Microphone Test
Test your microphone in your browser. See real-time audio levels, sample rate, and verify your mic is working.
Speaker Test
Test your speakers with different frequency tones. Check bass, midrange, and treble reproduction.
Browse by Category
53 tools across 6 categories — find the right test for your device
Display Tests27 tools
Dead pixels, backlight bleed, color accuracy, refresh rate
Input Tests9 tools
Keyboard, mouse, touchscreen, scroll, click speed
Audio Tests7 tools
Microphone, speakers, left/right channel, frequency
Camera Tests2 tools
Webcam preview, resolution, FPS
Controller Tests4 tools
Gamepad buttons, stick drift, vibration
Device Info4 tools
Screen resolution, browser details, GPU info
How It Works
Three steps to diagnose any device — no software, no account
Pick a test
Choose from 53 tools covering screens, keyboards, mice, webcams, microphones, speakers, and controllers.
Run it in your browser
Every test runs locally. Your camera, microphone, and input data never leave your device.
Get instant results
See real-time feedback on-screen. No waiting, no processing, no uploading.
Guides & Tutorials
Written by the engineers who build the tools
How to Check for Dead Pixels
Find dead and stuck pixels on any screen
Read guideDead Pixel vs Stuck Pixel
Learn the difference and how to fix each
Read guideHow to Test Backlight Bleed
Check your monitor for backlight bleed
Read guideIPS Glow vs Backlight Bleed
Tell the difference between IPS glow and bleed
Read guideHow to Test Keyboard Ghosting
Check your keyboard for ghosting issues
Read guideHow to Test Mouse Double-Clicking
Diagnose mouse double-click problems
Read guideHow to Test Monitor Refresh Rate
Verify 60Hz, 144Hz, or 240Hz
Read guideHow to Test Your Webcam
Check camera before Zoom or Teams
Read guideHow to Test Your Microphone
Test mic levels before a call
Read guideWhat is DeviceKit?
DeviceKit is a free collection of browser-based diagnostic tools that help you test your screen for dead pixels, backlight bleed, color uniformity, and refresh rate. It also includes tests for keyboards, mice, webcams, microphones, speakers, touchscreens, and game controllers. All tests run locally in your browser — your camera, microphone, and device data are never uploaded to a server.
100% Private
All tests run locally in your browser. Nothing is uploaded.
No Downloads
Works instantly — no software, extensions, or APKs to install.
Works Everywhere
Designed for monitors, laptops, phones, tablets, TVs, and Chromebooks.