Monitor Refresh Rate Test — Check Your Display Hz Online
A free browser-based tool that accurately detects your monitor refresh rate using frame timing analysis. Includes real-time frame time graphs, jitter measurement, comprehensive display info extraction (GPU, color gamut, HDR, resolution), and a visual motion smoothness demo.
Measure your display Hz, analyze frame timing, and check screen capabilities
Features
How to Test Your Monitor Refresh Rate
No installation needed. Works in Chrome, Firefox, Safari, Edge, and any modern browser.
The tool measures 300 frames to calculate your refresh rate with high accuracy.
See detected Hz, frame time, jitter, and a comparison with standard displays.
Frequently Asked Questions
How does this tool detect my monitor refresh rate?
The tool uses requestAnimationFrame to measure the time between consecutive screen redraws. By analyzing 300 frames and removing outliers, it calculates your display's actual refresh rate with high precision, typically within 1% of the true value.
Why does it show 60 Hz when my monitor supports 144 Hz?
Your operating system may default to 60 Hz. Check Windows Settings > Display > Advanced display > Refresh rate, or macOS System Preferences > Displays. Also verify your cable supports the required bandwidth (HDMI 2.0+ or DisplayPort 1.2+).
Can this tool detect FreeSync or G-Sync?
The Frame Timing tab analyzes frame time variance patterns. Variable refresh rate (VRR) technologies like FreeSync and G-Sync produce characteristic patterns that differ from fixed-rate displays. The tool flags likely VRR activity based on this analysis.
How accurate is this test?
Very accurate. The 300-frame measurement with outlier removal and warm-up phase typically achieves within 0.5-1% of your display's actual refresh rate. The confidence score indicates measurement reliability.
Does it work on phones and tablets?
Yes. Many modern phones run at 90 Hz or 120 Hz (like iPhone Pro, Samsung Galaxy S series, iPad Pro with ProMotion). This tool will detect the actual refresh rate your device is running at.
What can affect measurement accuracy?
Background tabs, heavy CPU usage, battery saver mode, and browser throttling can affect results. For best accuracy, close unnecessary tabs, plug in your device, and keep the browser tab in focus during the test.
