Screen Resolution Checker: What Is My Resolution?
See your screen resolution in real pixels, plus scaling, browser window size, color depth, HDR and color gamut, updated live. Copy the details in one click.
Runs in your browser. Your screen details never leave this device. No upload, no sign-up.
Your screen resolution
–pixels
Reading your screen…
| Screen size in CSS pixels | – |
|---|---|
| Available screen (without taskbar or Dock) | – |
| Aspect ratio | – |
| Color depth | – |
| Color gamut | – |
| HDR | – |
| Orientation | – |
| Touch points | – |
| More than one screen | – |
Your browser zoom may not be at 100%, which changes these numbers. Press Ctrl+0 (Command+0 on a Mac) to reset it; the page updates by itself.
The numbers update when you resize the window, zoom or move it to another screen.
Your report
Run the test above. Your results will appear here as plain text you can paste into a support chat, a return request or a forum post.
How to read your screen details
- Open this page on the screen you want to check. With more than one screen, drag the browser window onto it; the numbers update.
- Reset the browser zoom with Ctrl+0 (Command+0 on a Mac) so the figures are exact.
- Read your resolution at the top: the size of your screen in real pixels. The table underneath explains the rest.
- Press Copy report to copy everything as plain text for a support chat, a forum post or a game's settings.
Real pixels, CSS pixels and scaling
Your screen is a grid of real pixels, such as 3840 × 2160 on a 4K monitor. If every app used them one for one, text on a small, sharp screen would be tiny, so your system scales things up: at 150% scaling, every unit an app lays out becomes one and a half pixels across.
Web pages are laid out in CSS pixels, which are the scaled unit. Your browser reports the screen's size in CSS pixels, plus the device pixel ratio: how many real pixels make up one CSS pixel. This page multiplies the two to get your real resolution. A 4K screen at 150% scaling, for example, reports 2560 × 1440 CSS pixels and a ratio of 1.5, which makes 3840 × 2160 real pixels.
Browser zoom changes the device pixel ratio too, so at 110% zoom the ratio grows by a tenth. That's why the page asks you to reset the zoom before you trust the numbers.
On a Mac, the sizes in System Settings → Displays, from Larger Text to More Space, change the scaled size. Some of them draw the picture larger than the panel and shrink it to fit, so the resolution shown here can be bigger than the panel's own.
What the other numbers mean
- Browser window: the space this page has, in CSS pixels. It changes as you resize the window.
- Available screen: the screen minus the taskbar on Windows or the Dock and menu bar on a Mac.
- Aspect ratio: the screen's shape. Most monitors and TVs are 16:9, many laptops 16:10 or 3:2, and ultrawide monitors about 21:9.
- Color depth: bits per pixel. 24-bit is 8 bits for each of red, green and blue, about 16.7 million colors; 30-bit is 10 bits each. Many browsers report 24 even on screens that can show more.
- Color gamut: the range of colors the screen covers. sRGB is the standard for the web, Display P3 is wider and common on recent Macs, iPhones and some monitors, and Rec. 2020 is wider still.
- HDR: whether high dynamic range is on and available, so HDR video and games can show brighter highlights.
- Refresh rate: how many times a second the screen redraws, estimated from one second of frames. For a precise reading and dropped frames, use the refresh rate test.
Resolution not what you expected? Try these fixes
The resolution is lower than my monitor's
Windows 11
- Open Settings → System → Display and set Display resolution to the option marked (Recommended).
- If the right resolution is missing, update the graphics driver: right-click Start, open Device Manager, expand Display adapters, right-click your graphics card and choose Update driver, or get the driver from the maker's site.
macOS
- Open System Settings → Displays, select the display and choose Default, or the size that matches your display.
Cables and adapters
- An old cable, a cheap adapter or a dock can limit the resolution. Connect the monitor directly with the cable that came with it and check again.
Everything looks too big or too small
Windows 11
- Open Settings → System → Display and set Scale to the recommended value, or a step either side of it.
macOS
- Open System Settings → Displays and pick a size between Larger Text and More Space.
Browser
- If only web pages look wrong, it's the browser zoom: Ctrl and the plus or minus key change it, Ctrl+0 resets it (use Command on a Mac).
HDR says No on an HDR monitor
Windows 11
- Open Settings → System → Display, select the HDR monitor and turn on Use HDR, then reload this page.
macOS
- Open System Settings → Displays, select the display and turn on High Dynamic Range, if it's offered.
HDR also needs a connection that carries it, such as DisplayPort or a recent HDMI port and cable.
The numbers didn't change on another screen
The page updates when the window's size or scaling changes. Move the window fully onto the other screen; if nothing changes, reload the page there. Some privacy settings and extensions report a standard screen size instead of the real one, so try with them turned off.
Common questions
How do I find my screen resolution?
This page shows it at the top: the size of your screen in real pixels, worked out from what your browser reports. In Windows 11 you can also see it in Settings → System → Display, under Display resolution; on a Mac, in System Settings → Displays.
Why is my screen resolution smaller than my monitor's?
Your system is probably scaling the picture so that text isn't tiny. A 4K screen at 150% scaling, for example, gives apps the space of a 2560 × 1440 screen while still drawing with all of its pixels. Browsers report that scaled size in CSS pixels, and this page multiplies it by the device pixel ratio to get the real pixels.
What is device pixel ratio?
Device pixel ratio is how many real screen pixels make up one CSS pixel, the unit web pages are laid out in. It is 1 on a screen without scaling, 1.5 at 150% scaling, and 2 or 3 on most Retina and phone screens. Zooming in your browser changes it too, so reset the zoom to 100% for the true value.
Why does this page show a different resolution from my settings?
Browser zoom is the usual reason: press Ctrl+0 (Command+0 on a Mac) to reset it, and the numbers update. On a Mac set to a scaled resolution, the figure here is the size macOS draws at before fitting it to the panel. Some privacy settings and extensions also report a standard screen size instead of the real one.
Does my screen support HDR or a wide color gamut?
The table shows what your browser reports: HDR when high dynamic range is on and available, and the widest color gamut your screen covers, such as sRGB or Display P3. If your monitor supports HDR but this page says no, turn on HDR in Windows 11 under Settings → System → Display, then reload the page.
What resolution is 1080p, 1440p and 4K?
1080p, or Full HD, is 1920 × 1080 pixels. 1440p, also called QHD, is 2560 × 1440, and 4K UHD is 3840 × 2160. The number in the name is the height in pixels.
Something not right?
Tell us if your device wasn't found or a result looks wrong. Your browser, system and device model help us check.
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