Refresh Rate Test: Check Monitor Hz Online & See If You Are Stuck at 60Hz

This refresh rate test is built for the questions people actually have: is my monitor really running at 144Hz or 240Hz, why does my laptop or external display feel stuck at 60Hz, and did a cable, dock, adapter, battery mode, or browser setting limit the result. It is useful for gaming monitors, office displays, ultrawides, touch laptops, and high-refresh phones or tablets because it gives you a quick browser-level read without installing software.

What this tool measures

The tester samples recent frame timing with requestAnimationFrame and turns those samples into an estimated refresh rate, a likely standard rate, average frame time, and a stability score. That makes it useful for spotting whether the browser is presenting near 60Hz, 120Hz, 144Hz, 165Hz, 240Hz, or another common cadence. The chart is only a visual summary; the actual reading comes from browser-observed frame intervals.

Why a 144Hz or 240Hz display can still read near 60Hz

A lower-than-expected result usually points to settings or signal path issues before it points to a faulty panel. Common causes include the operating system staying at 60Hz, a dock or adapter that caps the signal, an older HDMI cable, battery saver reducing presentation cadence, variable refresh behavior, or the page losing focus. External monitors connected through USB-C hubs or budget adapters are especially common sources of a hidden 60Hz cap.

• A reading near 60Hz often means the browser is currently limited to the standard desktop cadence.
• A reading near 120Hz, 144Hz, 165Hz, or 240Hz suggests your higher refresh mode is active in the browser.
• Large swings usually mean tab switching, background load, browser throttling, adaptive refresh, or unstable power and display conditions.
• Testing in full screen with the page focused usually gives a cleaner sample.
• A browser-level result is excellent for diagnosis, but it is still not the same as reading exact monitor firmware or GPU output metadata.

What this result can and cannot confirm

This page is strong for practical troubleshooting: checking whether a high-refresh mode is reaching the browser, comparing the same device across battery and charging modes, and checking whether a cable, dock, browser, or output path is holding you back. It does not directly read monitor firmware, verify cable bandwidth, prove panel specs by itself, or expose the full state of variable refresh technologies. It also does not store personal data.