Test your screen.
Know your display.
Check monitor timing, pixels, uniformity, and motion, plus mouse and keyboard input. Tests run in your browser with no software installation or account.
Guided monitor test and individual tools available
Your screen, at a glance
Browser-reported- Screen size
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- CSS pixels
- Browser viewport
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- CSS pixels
- Pixel ratio
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- device pixel ratio
- Color depth
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- browser-reported
Orientation: —Browser-reported
Enable JavaScript to see browser-reported screen information. Screen size uses CSS pixels, not physical panel resolution.
One screen. A closer look.
Choose what you want to check. Each test has a clear purpose.
13 available tests
Dead Pixel Test
Inspect your display for dead or stuck pixels using solid colors.
Refresh Rate Test
Estimate your browser’s frame cadence and a likely refresh-rate class.
Ghosting Test
Inspect monitor trails and overshoot around original moving block edges.
Motion Blur Test
Compare moving text and fine bars to visually inspect motion clarity.
Backlight Bleed Test
Inspect light leakage and dark-screen uniformity on your monitor.
OLED Screen Test
Inspect uniformity, image retention, and persistent image patterns.
Frame Rate Test
Sample browser animation timing to estimate FPS and frame consistency.
Gray Screen Test
Use a neutral gray surface to visually inspect display uniformity.
White Screen Test
Inspect a white surface for pixel defects and uneven brightness.
Black Screen Test
Inspect a black surface for light leakage and bright stuck pixels.
Mouse Test
Check browser-visible mouse buttons, movement, and wheel input.
Mouse Click Test
Compare deliberate clicks, close intervals, and browser double-click events.
Keyboard Ghosting Test
See which simultaneous key presses are received by your browser.
Useful information, without the guesswork.
Browser tests have limits. We’ll explain what each result means and what your browser can actually measure.
Put the observation in context.
Practical reading for display timing, pixel dots, and moving edges.
What is monitor refresh rate?
Separate monitor Hz, browser frame delivery, and pixel transitions before interpreting a timing result.
Read guidePixels & uniformityHow to test for dead and stuck pixels
Use a short color sequence to compare a suspicious dot, distinguish surface marks, and document what remains fixed.
Read guideRefresh & motionHow to test monitor ghosting and overshoot
Keep speed and background consistent while comparing trails and halos around original moving blocks.
Read guide