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This refresh rate test measures your display's actual frame rate using the browser's requestAnimationFrame API. For most accurate results, close other tabs and apps.

Refresh rate test — measure your screen Hz & FPS online

Test your display refresh rate online for free. Measure your monitor Hz in seconds—check if you have 60Hz, 120Hz, 144Hz, or 240Hz. No download required.

What is a refresh rate test (Hz test / FPS tester)?

A refresh rate test (also called a frame rate test, FPS tester, or Hz checker) measures how many times per second your screen can refresh the displayed image. It works by tracking browser frame callbacks to calculate your display's actual refresh rate in Hertz (Hz). For example, a 60Hz monitor refreshes 60 times per second, while a 120Hz gaming monitor refreshes 120 times per second—making motion appear smoother and more responsive. This online refresh rate tester runs entirely in your browser using the requestAnimationFrame API to give you an accurate Hz measurement in seconds. Unlike system settings that may show what your monitor supports, this frame rate test measures what your screen is actually outputting right now.

Online refresh rate tester features

A complete browser-based Hz tester that measures your monitor refresh rate, frame rate, and FPS in real time.

  1. Accurate refresh rate measurement in Hz: This refresh rate test measures your display's actual frame rate over 3 seconds using hundreds of frame samples. The result shows your monitor Hz—30Hz, 60Hz, 120Hz, 144Hz, or 240Hz. No guessing, just measured data.
  2. Frame rate / FPS test for any screen: Whether you call it a refresh rate test, frame rate test, FPS test, or Hz tester—this tool tells you exactly how many frames per second your monitor, laptop screen, or phone display is currently outputting.
  3. Auto-detection of common refresh rates: The Hz tester automatically identifies if your display matches a common refresh rate (60Hz, 120Hz, 144Hz, 240Hz). Great for verifying your gaming monitor is actually running at its advertised speed.
  4. Visual FPS comparison — low FPS vs high FPS: See the difference between low and high refresh rates with animated bouncing dots at 12, 30, 60, 120, and 240 FPS. The visual comparison makes it clear why a higher refresh rate means smoother motion.
  5. Refresh rate comparison chart: A bar chart shows how your measured refresh rate compares to common standards: 30Hz, 60Hz, 120Hz, 144Hz, and 240Hz. Your rate is highlighted so you can instantly see where your display falls.
  6. Works on monitors, laptops & phones: This online FPS tester works on any device with a browser. Test your monitor Hz on Windows and Mac, check your laptop screen refresh rate, or measure your phone display FPS. Mobile-friendly refresh rate checker.

How to test your refresh rate online

A simple step-by-step guide to measure your monitor Hz and frame rate using this free online refresh rate tester.

  1. Open the refresh rate test page: The FPS test starts automatically. Keep your browser in focus and avoid switching tabs for the most accurate measurement.
  2. Wait for the measurement: The refresh rate tester samples hundreds of frames over 3 seconds. Keep the window still—moving it or scrolling can affect the Hz measurement.
  3. Check your result: Your display refresh rate appears in large digits at the top. The Hz tester also shows a comparison chart and identifies which common refresh rate matches your display.
  4. Compare refresh rates visually: Scroll down to see the visual FPS comparison. The bouncing dot animations at 12, 30, 60, 120, and 240 FPS show the real difference between low and high frame rates.

Refresh rate test — troubleshooting & tips

Tips for getting accurate refresh rate measurements and understanding your FPS test results.

  1. Close other tabs and apps for accuracy: Background tabs and apps consume GPU resources and can lower the measured frame rate. Close unnecessary programs before running this frame rate test for the most accurate Hz reading.
  2. Keep the browser window in focus: Browsers throttle requestAnimationFrame when tabs are in the background. Keep this refresh rate tester visible and focused during the entire measurement.
  3. Enable high refresh rate in OS settings: If you have a 120Hz, 144Hz, or 240Hz monitor but the Hz test shows 60Hz, check your display settings. On Windows go to Settings > Display > Advanced Display. On macOS go to System Settings > Displays > Refresh Rate.
  4. Check your cable and port: Some HDMI cables and ports are limited to 60Hz. For high refresh rates like 144Hz or 240Hz, use DisplayPort or HDMI 2.0/2.1 cables. A bad cable can cap your refresh rate.
  5. Test multiple times for consistency: Run the refresh rate test 2-3 times. The result should be consistent. If it varies significantly between tests, background processes may be interfering with the measurement.
  6. Browser GPU acceleration must be on: This FPS tester requires hardware acceleration. Make sure it is enabled in your browser settings (Chrome: Settings > System > Use hardware acceleration when available).
  7. Mobile browsers may report lower FPS: Most modern phones have 120Hz displays. If this Hz test shows 60Hz on your phone, your browser or power-saving mode may be limiting the refresh rate.

Frequently Asked Questions

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