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120Hz Test — Check Your Display Runs at 120 Hz

Measure the refresh rate your browser really renders: a live Hz readout from frame timestamps, a frame-time graph, a skipped-frame counter and a UFO-style smoothness test.

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Measured refresh rate
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Skipped frames

This measures the animation rate of this browser tab, not the panel's spec sheet: low-power mode, background throttling and some browsers (notably Safari) can cap it below what the display supports.

🛸 Full rate · — Hz
🛸 Half rate · — Hz
🛸 Quarter rate · — Hz
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Result

This page runs the refresh rate test tuned for 120 Hz displays: the live readout measures the rate this browser tab really receives, and the verdict tile marks pass or fail against 120 Hz with ±5% tolerance.

120 Hz is the signature rate of modern phones and tablets with adaptive displays, high-end laptops and TVs with gaming modes. Adaptive panels add a twist: to save power they drop to a much lower rate when nothing moves, and only ramp up under motion. The animated strips on this page keep the screen busy, which is usually enough to hold an adaptive panel at its top rate during the test.

If the verdict stays at fail, work through the honest checklist: smooth or high-performance mode enabled in system settings, battery saver off, and — on laptops and monitors — a cable and port that actually carry 120 Hz at your resolution. Some browsers also cap animation frames below the display's rate, so a second browser is a useful cross-check.

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Executed in Browser

Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

Accepted Formats & Rules

  • Live Hz readout computed as the median of the last 60 requestAnimationFrame intervals.
  • UFO-style motion strips at full, half and quarter of the measured rate with an adjustable speed slider.
  • Frame-time graph with slow frames highlighted and a running skipped-frame counter.

Key Benefits

✓ Instant answer: measurement starts the moment the page loads and settles on a stable median reading within a second or two.
✓ Sees real problems: the frame-time graph and the skipped-frame counter expose stutter that a single averaged number would hide.
✓ Honest numbers: the tool reports what this browser tab actually receives — and tells you when the browser, not the display, is the limit.

Use Cases

  • • Verify a new 120, 144 or 240 Hz monitor is actually running at its advertised rate and not the 60 Hz the operating system defaulted to.
  • • Catch silent throttling: watch live as battery saver, low-power mode or a busy browser caps the animation frame rate of your tab.
  • • Show someone why high refresh matters with the moving strips — the same speed rendered at full, half and quarter of the measured rate.