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Multiple Monitor Test

This free online Multiple Monitor Test shows every display connected to your computer and how your desktop is laid out across them. For each monitor you get its name, whether it's built in or external, its native resolution and scaling, and its color depth, plus a drawing of the arrangement with the screen this window is on highlighted. It's a quick way to check that a new monitor, dock or adapter is detected at the resolution you expect.

Multiple Monitor Test

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How to use the multiple monitor test

  • Monitor count: How many screens your desktop spans. Chrome and Edge report this without asking.
  • Show all monitors: With more than one monitor, Chrome and Edge ask for "window management" permission once to share each monitor's details. If you've already allowed it, the list appears by itself.
  • Layout drawing: Each monitor drawn to scale, in the positions set in your system's display settings. The screen this window is on is highlighted; drag the window to another screen and it follows.
  • Name: The monitor's model as your system reports it, such as "DELL U2723QE", or "Built-in Retina Display" for a laptop screen.
  • Resolution: The native resolution in physical pixels. The browser works in scaled units, so this multiplies them by the scaling to show what the panel really has.
  • Refresh rate: Measured, not reported: browsers draw frames in step with the monitor a window is on, so the test times them to show that monitor's rate, such as 60, 144 or 240 Hz. Drag the window onto each monitor to fill in the others; each result is remembered while the page is open.
  • Scaled: Your display scaling for that monitor, such as 100%, 125% or 200%.
  • Color depth: 24-bit is standard; 30-bit usually means a 10-bit or HDR display mode.
  • Position: Where the monitor sits in your desktop layout, in scaled pixels from the primary screen's top-left corner.

Firefox and Safari only describe the screen the browser window is on, so the test shows that screen alone.

What to check

  • A monitor is missing: Your system isn't detecting it. Check the cable and input source, and look in your system's display settings.
  • Wrong resolution: If the resolution is lower than the monitor's specification, change it in display settings, or try a different cable or port. Older HDMI cables and some adapters limit resolution.
  • Unexpected scaling: Mismatched scaling between monitors makes windows jump in size when you move them. Set it per monitor in display settings.
  • Layout doesn't match your desk: If the drawing shows a monitor on the wrong side, your mouse won't move between them naturally. Drag the monitors into the right order in display settings.

Common Issues & Fixes

Only one monitor is shown

  • Browser: Use Chrome or Edge on a desktop. Firefox, Safari and phone browsers only report the current screen.
  • Mirroring: Monitors set to duplicate (mirror) count as one screen. Switch to "Extend these displays" in your system settings.
  • Detection: If your system doesn't see a monitor, the browser can't either. Check the cable, the monitor's input source, and your graphics drivers.

It says window management is blocked

  • Site permission: Click the icon next to the address bar, open site settings, and set Window management to Allow. Then reload the page.

The resolution looks wrong

  • Scaling: The browser reports scaled sizes; the test converts them using each monitor's scaling. If your browser is zoomed in, reset it with Ctrl+0 (Cmd+0 on Mac) first.
  • Display settings: Set the monitor to its recommended (native) resolution in your system settings.

Use this multiple monitor test to confirm your setup after connecting a dock, adapter or new display. To check a screen itself for faults, try the dead pixel test.

Frequently asked questions

Can it show my monitor's refresh rate?

Yes, by measuring it. Browsers don't report refresh rates, but they draw in step with the monitor the window is on, so the test times those frames. Move the window to each monitor to measure them all. It can read lower than the monitor's maximum if battery saver caps the browser at 60 Hz, or on variable-refresh (FreeSync or G-Sync) monitors when little is changing on screen. Some systems also run every monitor at the slowest one's rate, and the test shows that as it is.

Why does it ask for window management permission?

Listing every monitor's name and layout is permission-protected in Chrome and Edge, because it reveals details about your setup. The test only displays it to you; nothing is sent to our server.

Is my information sent anywhere?

No. Everything is read and shown in your browser.