Screen Resolution Checker
See your screen resolution, browser viewport size, device pixel ratio, aspect ratio, refresh rate, HDR support and colour gamut instantly. Updates live as you resize or rotate.
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About this tool
About Screen Resolution Checker
Screen Resolution Checker reads your display details straight from the browser the moment the page opens. It shows the screen resolution in CSS pixels, the physical pixels (resolution multiplied by the device pixel ratio), the size of the browser viewport, and the screen area available outside the taskbar or dock. It names the resolution when it matches a common standard such as Full HD (1080p), Quad HD or 4K, and shows the aspect ratio as a familiar name like 16:9 or 16:10 alongside the exact ratio. It also measures the refresh rate by counting animation frames for one second, and checks whether the display supports HDR and a wide colour gamut such as Display P3. It shows the colour depth, orientation, touch support, primary pointer type, and whether dark mode or reduced motion is requested. The values update as you resize the window or rotate a device, and Copy All puts every detail on your clipboard for a bug report. Everything is read locally; nothing is sent to our server.
How to use Screen Resolution Checker
1
Open the page
Your resolution, viewport and pixel ratio appear straight away. There is nothing to install or click.
2
Wait one second
The refresh rate is measured by counting frames for a second, then snapped to the nearest common rate.
3
Copy the details
Click Copy All to paste every value into a support ticket, bug report or chat.
4
Resize or rotate to compare
Resize the browser window or rotate your device; the viewport and orientation values update instantly.
Key features
Screen vs viewport
Shows both the full screen size and the space your browser window actually uses, which is what websites see.
Real pixel count
Physical pixels reveal the true panel resolution on Retina and scaled Windows displays.
Refresh rate and HDR
Measures 60, 120, 144 Hz and more, and detects HDR and Display P3 colour support.
Live updates
Resize the window or rotate your phone and every value refreshes instantly.
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When to check your screen
Common reasons people look this up
Web designers and developers
Check viewport size and pixel ratio when testing responsive layouts and breakpoints.
ExampleA layout breaks at 1280 × 720; the viewport reading shows the window is actually 1263 px wide because of the scrollbar.
Bug reports
Give support teams exact display details instead of guessing.
ExampleCopy All produces resolution, viewport, DPR, refresh rate and colour depth to paste into a ticket.
Gamers and new monitors
Confirm a high-refresh monitor is really running at 144 Hz or more.
ExampleA new 165 Hz monitor reads ~60 Hz, which shows the refresh rate still needs changing in display settings.
Wallpapers and screenshots
Find the exact pixel size to download a sharp wallpaper or plan screenshot sizes.
ExampleA laptop shows 1440 × 900 at 2x, so a 2880 × 1800 wallpaper matches the panel exactly.
Remote support
Help someone describe their display exactly when troubleshooting a layout or video call.
ExampleA customer copies all details into a chat, revealing a 1.5x pixel ratio that explains blurry screenshots.
Presentations and screen sharing
Check your resolution before sharing your screen or presenting on a projector.
ExampleA 4K laptop shares at 3840 × 2160, making text tiny for viewers; switching to 1080p fixes it.
Reading your display details
What the numbers mean
Scaling changes the numbers
With Windows scaling at 125% or 150%, the CSS resolution is smaller than the monitor’s native resolution. Physical pixels show the real panel size.
Measure refresh rate with the tab visible
Browsers slow animation in background tabs. Keep the page in front and click Refresh for an accurate reading.
Viewport is what websites use
Responsive layouts respond to the viewport, not the full screen. Test designs against the viewport value.
HDR needs the setting on
If your monitor supports HDR but it shows SDR, turn on HDR in your operating system’s display settings.
Test common breakpoints
Resize the window to 375, 768 and 1280 pixels wide to see how your site behaves on phones, tablets and laptops.
Keep a copy for bug reports
Copy All produces a plain text summary you can paste into any ticket or chat.
