Refresh Rate Test
See the refresh rate your browser is actually running at, how steady each frame is, and whether motion looks smooth.
- Measured Hz
- Frame-time graph
- Motion test
- Resolution & HDR
What is a refresh rate test?
Refresh rate is how many times per second your display draws a new image, measured in hertz (Hz). A refresh rate test measures how often the browser can paint a frame, which matches the display’s refresh rate when everything is set up correctly. This test times every animation frame, rounds to the nearest common rate such as 60, 120, 144, 165 or 240 Hz, and shows frame time, jitter and late frames on a live graph. A moving square lets you judge smoothness and ghosting, and the panel lists your resolution, pixel ratio, colour depth, colour gamut and HDR support.
How to check your refresh rate
- Open the page on the screen you want to test and keep the tab in front.
- Wait a few seconds for the reading to settle. Avoid moving other windows.
- Compare the result with your monitor’s rating. If a 144 Hz monitor shows 60 Hz, change the refresh rate in your display settings.
- Watch the moving square. Raise the speed to see stutter (dropped frames) or a trailing blur (slow pixel response).
Stuck at 60 Hz? Check these
- Windows: Settings › System › Display › Advanced display › Choose a refresh rate.
- macOS: System Settings › Displays › Refresh rate (ProMotion MacBooks may show “ProMotion”).
- Cable: many HDMI 1.4 cables and ports top out at 60 Hz at high resolutions. Use DisplayPort or HDMI 2.0/2.1.
- Battery saver and browser settings can cap animation to 60 Hz or lower. Plug in the laptop and turn off energy-saving modes.
- On multi-monitor setups, some browsers sync to the slowest screen. Test with only the target display connected.
Why use this refresh rate test
- Measured liveUses real frame timing in your browser, not a value from a settings file.
- Frame pacing viewThe graph shows jitter and late frames that average FPS counters hide.
- Display detailsResolution, physical pixels, pixel ratio, colour depth, gamut and HDR in one place.
- No download or driverRuns in Chrome, Edge, Firefox and Safari on Windows, macOS, Linux, ChromeOS, Android and iPhone.
When to run a refresh rate test
- New gaming monitor. Confirm 144 Hz or 240 Hz is actually enabled.
- Cable and port checks. Find out when an HDMI cable or port limits you to 60 Hz.
- Laptops with variable refresh. See whether battery saver drops the rate to 60 Hz.
- Multi-monitor setups. Drag the window to each screen and compare.
Checking a whole setup? Run the mic test, webcam test, keyboard test, mouse test, gamepad tester, sound test and dead pixel test, or browse all device tests.
Example: a 165 Hz monitor reading 60 Hz
The test shows 60 Hz with 16.67 ms frames. In Windows display settings the refresh rate is set to 60 Hz; changing it to 165 Hz makes the test read 165 Hz. If 165 Hz is not offered, swap the HDMI cable for DisplayPort.
What to expect from the result
Browsers can only paint as fast as the display and their own settings allow, so the result is the rate the browser runs at on this screen. Variable refresh (G-Sync, FreeSync, ProMotion) can make the reading change. Background tabs are throttled, so keep this one visible.
Refresh Rate Test questions
How do I check my monitor’s refresh rate?
Open this page on that monitor and wait a few seconds. The large number shows the refresh rate in Hz, measured from the browser’s frame timing.
Why does my 144 Hz monitor show 60 Hz?
The display is usually set to 60 Hz in system settings, the cable or port does not support 144 Hz at your resolution, or battery saver is limiting the rate.
Is this the same as a UFO test?
It includes a similar moving-object test for smoothness and ghosting, plus a measured refresh rate and a frame-time graph.
Is FPS the same as refresh rate?
Not exactly. Refresh rate is how often the display updates; FPS is how many frames a game or app produces. In this test the browser draws one frame per refresh, so they match.
Can a browser show more than 60 Hz?
Yes. Chrome, Edge, Firefox and Safari run animations at the display’s refresh rate, including 120, 144, 240 Hz and higher, when the system is set up for it.