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Refresh rate test

See how many times a second this browser draws your screen, measured from its frames, on your device. Free, with no account or uploads.

Measure your refresh rate

The rate is measured for two seconds as soon as the page opens; keep it in front while it measures.

The rate this browser draws at

Not measured yet

Frames a second
–
Pixels to one CSS pixel
–
  • This is how often this browser draws the page. The screen's own rate can be higher when the browser draws slower: in power saving or low-power mode, on battery, on a second screen, or when the screen's setting is lower than it can go.
  • A screen with a variable rate (ProMotion, FreeSync, G-Sync) may slow down while nothing moves. Keep this page in front while it measures.

The screen fills with black, white, red, green, blue and grey, then two ramps. Press anywhere or the right arrow for the next, the left arrow to go back, and Escape to leave. Clean the screen first: dust looks like a dead pixel.

These pictures show faults; nothing on a page can repair a stuck or dead pixel.

How it works and help
Everything happens in your browser. Nothing you press is sent anywhere or kept.

A little help along the way

Follow these steps. Every option is explained underneath. Everything happens in your browser; nothing you press is sent anywhere.

  1. Choose your keyboardThe shape (ANSI, ISO, JIS, ABNT2, Korean or Mac) is guessed from your system; change it if it is wrong, and choose the size: full, tenkeyless, 75%, 65%, 60% or the number pad.
  2. Click the board and press your keysEach key lights while held and keeps a tick once it has worked. The site's own shortcuts step aside while you test. Press Escape twice to leave.
  3. Hold several at onceTo test ghosting and rollover, hold many keys together; the result keeps the most held at once.
  4. Read the resultIt says how many keys have worked, which are still to press, the most held at once, and any key that bounced.

Questions people ask

Why does it say 60 Hz on my 120 Hz screen?
This is how often the browser draws; power saving, battery, low-power mode, a second screen or a display setting below the screen's best can keep it at 60.
How is the rate measured?
From the times of the browser's animation frames over two seconds: one over the middle gap, so a late frame does not move it, rounded to a usual rate when within 3%.
Does a variable refresh rate change it?
It can: ProMotion, FreeSync and G-Sync screens may slow down while nothing moves, so keep the page in front while it measures.

This page is the Keyboard tester, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the Keyboard tester's own page.

Read the step-by-step guide

Guides

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