Description
About Refresh Rate Test
Introduction
This page estimates refresh rate from animation-frame timing in the browser. It is not a laboratory Hz meter. Power saving, browser scheduling, and windowed mode can change the result.
What this tool does
It samples frame timestamps and reports an estimated Hz. It does not read the panel’s EDID directly.
When to use it
Use it for a quick browser-context estimate. Confirm the mode in your OS display settings when accuracy matters.
How it works
Supported: all modern browsers that run animation frames. Limits: estimates can sit below the panel’s rated Hz under load or without fullscreen. Permissions: none (fullscreen optional). Hardware: any display; high-Hz panels need a matching OS mode. Expected: an approximate Hz number close to 60/120/144 in good conditions, with variance.
Step-by-step instructions
- Optionally enter fullscreen.
- Run the estimate and wait for it to settle.
- Compare with the refresh rate selected in your OS.
Common problems
Lower than expected Hz often means the browser is not matching the panel mode, or the tab is under load.
Privacy explanation
Timing stays local. No permission beyond optional fullscreen.