Screen refresh rate test
Refresh Rate Test for checking screen Hz online.
Run a browser-based refresh rate test to estimate screen Hz, frame interval stability, jitter, and display smoothness online. This tool is built for gamers, monitor buyers, competitive players, and users troubleshooting motion smoothness issues without installing software.
Method
How this refresh rate test works
The test uses the browser animation loop to collect frame interval samples. Those intervals are converted into a current Hz estimate, a nearest common refresh rate, jitter, confidence, and stability signals.
A stable 60 Hz display usually produces frame intervals near 16.67 ms. A 120 Hz display is closer to 8.33 ms, and 144 Hz is close to 6.94 ms. The test compares the sampled timing against common refresh rates while also checking variance.
Browser timing can be affected by system load, battery saver, external displays, inactive tabs, and OS display settings. For cleaner comparisons, run the test in a focused tab for at least 15 to 30 seconds.
Cleaner results
Get a better screen Hz reading
Keep the browser tab focused while the test runs.
Close heavy apps, downloads, and game launchers.
Turn off battery saver or low-power mode.
Use the display you want to test as the active screen.
Avoid resizing the window during a measurement run.
Compare more than one run before diagnosing a problem.
Limits
What an online refresh rate test can tell you
This online refresh rate test helps confirm whether browser frame timing behaves like 60 Hz, 120 Hz, 144 Hz, 165 Hz, 240 Hz, or another common display mode. It is useful when checking browser smoothness, monitor settings, and motion consistency.
It cannot replace hardware measurement tools. If the result looks wrong, check your OS display refresh rate, browser settings, power mode, connected displays, and GPU driver configuration.
Related Tools
Display performance tools in the suite
FAQ
Refresh Rate Test Questions
What does this refresh rate test measure?
It samples browser animation frame intervals and estimates the screen refresh rate in Hz. It also reports frame interval, jitter, confidence, and display smoothness signals.
Is a browser refresh rate test exact?
No. Browser scheduling, OS power mode, active tabs, connected displays, and background work can affect timing. Use it as a practical online screen Hz check, not a lab-grade instrument.
Why does the result differ from my monitor setting?
Your OS may be using a different display mode, the browser may be throttled, battery saver may be active, or another display may be affecting the active window timing.
How do I get a cleaner refresh rate result?
Keep the tab focused, close heavy apps, avoid resizing the window, disable low-power mode, and let the test run for 15 to 30 seconds.