Guides

Display tests

White Screen TestBlack Screen TestRed Screen TestGreen Screen TestDead Pixel TestMonitor TestRefresh Rate TestScreen Resolution Checker

Accessibility and color

Color Contrast CheckerColor Blindness Test

Camera and audio

Webcam TestMicrophone TestSpeaker Test

Input devices

Keyboard TestMouse Click Test

Free · No install · Runs in your browser

Find out if it's your screen, not your eyes.

Dead pixels, contrast ratios, webcam glitches, stuck keys: small, fast diagnostic tools for screens and the hardware attached to them. No signup, no downloads, no app store.

Try the White Screen Test Browse all tools
01 · BrowserRuns in your browserNo install, no account.
02 · PrivacyNothing is uploadedCamera and mic feeds stay in your tab.
03 · HonestNo fake or prank screensOnly tests that find real faults.

Tools

Pick a test to get started. Each one opens straight into the tool, no menus to dig through.

01

Display tests

08 TOOLS
01White Screen TestFull-screen pure white to spot dead or stuck pixels, backlight bleed, and panel dirt.Open tool → 02Black Screen TestFill the screen with black to spot backlight bleed, glow and stuck bright pixels.Open tool → 03Red Screen TestFill the screen with pure red to find dead pixels and stuck green or blue subpixels.Open tool → 04Green Screen TestFill the screen with pure green to spot stuck pixels, green tint and uneven color.Open tool → 05Dead Pixel TestCycle through five solid colors to isolate dead, stuck, or hot pixels anywhere on your display.Open tool → 06Monitor TestStep through fullscreen patterns that reveal banding, bad geometry and blur.Open tool → 07Refresh Rate TestMeasure your screen's real Hz, frame time and dropped frames in five seconds.Open tool → 08Screen Resolution CheckerSee your resolution, window size, pixel ratio and aspect ratio in one place.Open tool →
02

Accessibility and color

02 TOOLS
09Color Contrast CheckerCheck any two colors against WCAG AA and AAA contrast ratio thresholds.Open tool → 10Color Blindness TestRead numbers hidden in colored dots to screen for red-green and blue-yellow difficulty.Open tool →
03

Camera and audio

03 TOOLS
11Webcam TestPreview your camera feed live and check its resolution and frame rate.Open tool → 12Microphone TestWatch a live volume meter to confirm your microphone works before a call.Open tool → 13Speaker TestPlay tones through the left and right channels to check speakers or headphones.Open tool →
04

Input devices

02 TOOLS
14Keyboard TestPress every key and see it light up to find keys that do not register or stick.Open tool → 15Mouse Click TestClick every button and scroll the wheel to catch dead buttons and double-click faults.Open tool →

What ScreenTestHQ covers

ScreenTestHQ is a set of free, genuine display and device diagnostics. No fake or prank screens, just tests that tell you something real. The tools fall into three groups: panel checks like solid-color, dead pixel, test pattern, refresh rate and screen resolution tests that reveal hardware faults or settings problems; accessibility and color checks like contrast ratios and color vision screening; and hardware checks for the camera, microphone, speakers, keyboard and mouse attached to your screen.

Every tool runs entirely in your browser: nothing to install, nothing uploaded.

Frequently asked questions

Is ScreenTestHQ actually free, or is there a catch?

Free with no catch: no account, no trial period, no upsell partway through a test. Every tool runs directly in your browser and stays that way.

Do I need to install anything?

No. Open a tool page and it works immediately: nothing to download, no browser extension, no app store detour.

Is any of my screen, camera, or audio data sent anywhere?

No. Screen tests are just colors rendered locally, and tools that use your camera or microphone process that feed entirely on your device. Nothing is recorded or uploaded.

Can I use these on my phone, or only on a computer?

Both. Every tool adapts to whatever screen you're on, from a phone held in one hand to a multi-monitor desktop setup.

What makes this different from any other "test your screen" site?

Fewer gimmicks. Every tool here is a genuine diagnostic, no fake glitch effects or prank screens, and the site is built to load fast rather than bury tools behind ads and pop-ups.

Do these tools work in any browser?

Yes. Everything is built with standard web technology and runs in any modern browser (Chrome, Safari, Firefox, or Edge) with no plugins required.