Screen Resolution & Refresh Rate Test
Compare screen and viewport dimensions, estimate browser refresh cadence, inspect frame timing and observe motion at several speeds.
1. Screen Information
Reading browser-reported display information…
Dimensions are browser-reported CSS pixels and are not claimed to be the panel's exact physical/native resolution.
2. Refresh Rate Test
Measures approximately five seconds of browser animation-frame cadence.
Estimated Refresh Rate
—Hz
Observed animation FPS
Not measured
Valid frame samples
Not measured
Start a five-second test to estimate browser-observed frame cadence.
For cleaner results, keep this tab active on the monitor you want to measure, avoid heavy background activity, and repeat the test if timing is unstable. The estimate reflects browser animation timing, not a guaranteed physical panel refresh rate.
3. Motion Smoothness Test
Observe time-based horizontal movement at your chosen speed.
4. Frame Timing Results
Complete a Refresh Rate Test to view frame timing statistics and the sampled interval chart.
Timing variation reflects browser and system scheduling and is not, by itself, evidence of a display defect. This test does not measure response time, ghosting, or input lag.
How to use Screen Resolution & Refresh Rate Test
- 1
Review Screen Information for display, available area, viewport and device-pixel-ratio values.
- 2
Click Start Test and keep the tab visible while roughly five seconds of animation frames are sampled.
- 3
Compare the estimated refresh rate, confidence and detected timing interruptions.
- 4
Use the Motion Smoothness Test at Slow, Medium or Fast speed, optionally in fullscreen.
- 5
Inspect Frame Timing Results and copy the complete report when you need to share it.
Frequently asked questions
About Screen Resolution & Refresh Rate Test
Resolution and refresh rate describe different aspects of a display: one concerns the coordinate space, while the other concerns how frequently new frames reach the browser. The information panel keeps screen size, available area, viewport and pixel ratio separate so scaled systems are not mistaken for lower-resolution panels.
The timed test samples requestAnimationFrame intervals and summarizes their center, spread and interruptions. A compact chart exposes frame-to-frame variation, while the motion panel provides a visual comparison at controlled speeds. Results are useful diagnostic observations, not direct readings from monitor firmware.