What Is My Screen Resolution

About the screen resolution checker

What is my screen resolution? This page tells you at once. The big number at the top is your screen resolution in real pixels — the tiny dots your screen is made of — for example 1920 × 1080 or 2560 × 1440. Next to it you see the common name (like Full HD or QHD) and the aspect ratio (like 16:9).

The cards below show more about your screen and browser. Everything is read on your own device. Nothing is sent anywhere.

Features

• Real resolution — your screen size in real pixels, with its common name and aspect ratio.
• Landscape or portrait — shows which way the screen is turned, and the width and height follow it when you turn a phone or tablet.
• Scaling shown — the device pixel ratio and the matching Windows or Mac scaling, like 125% or 150%.
• Window size — the browser window inside and outside, and the viewport without the scroll bar.
• Colour facts — colour depth in bits, HDR on or off, and the colour gamut (sRGB, Display P3, Rec. 2020).
• Refresh rate estimate — a quick check of how many times per second your screen redraws.
• Live updates — the numbers change as you resize, zoom, turn a phone or move to another monitor.
• Copy all — one button copies a plain text summary to share with support or a friend.

How to use it

• Open the page — your screen resolution shows at once
• Read the big number for the real pixels, and the name and aspect ratio below it
• Look at the cards for scaling, window size, colour depth and HDR
• Resize the browser window or move it to another monitor to see the numbers change
• Press Copy all to copy every value as plain text
• If a zoom warning shows, press Ctrl+0 (Cmd+0 on a Mac) for the real values

Why the number can be different from the box

Your monitor's box says, for example, 2560 × 1440. But many websites show a smaller number, like 1707 × 960. Both are true. The small number is in CSS pixels, and the big one is in real pixels.

• Display scaling. Windows often makes text bigger with 125% or 150% scaling. At 150%, 2560 real pixels become about 1707 CSS pixels. This page multiplies back to show the real number.
• Retina and phone screens. These use 2 or 3 real pixels for each CSS pixel. That is the device pixel ratio (2× or 3×).
• Browser zoom. Zoom also changes the device pixel ratio, on every website. Reset it to 100% to see the right value.

How to find the real resolution in your settings

• Windows 11: right-click the desktop and choose Display settings. Look at Display resolution (the one marked "Recommended" is the real size of the screen) and Scale (like 125%).
• Windows 10: right-click the desktop, choose Display settings, then look at Display resolution and Scale and layout.
• macOS: open System Settings → Displays. The Mac shows a "looks like" size; the real panel size is often twice as big.
• Phone: the settings rarely show pixels. This page is the quickest way.

What are CSS pixels?

Web pages count sizes in CSS pixels, so they look about the same on every screen. On an old office monitor, one CSS pixel is one real pixel. On a sharp laptop or phone, one CSS pixel is drawn with 2 × 2 or 3 × 3 real pixels: text looks crisp but stays the same size. Web designers use the viewport size (the inside of the browser window, in CSS pixels) to fit a page to phones and big screens.

Common screen resolutions

Phones are tall and thin. Many have about 1080 × 2400 or 1170 × 2532 real pixels, with ratios like 19.5:9 or 20:9. The width comes first, so a phone held upright (portrait) shows the small number first, like 1170 × 2532. Turn it sideways (landscape) and it becomes 2532 × 1170.

Frequently asked questions

What is my screen resolution?

The big number at the top of this page, for example 1920 × 1080. It is in real pixels. The name and the aspect ratio are right under it.

Why is my screen resolution smaller on other websites?

Your computer probably uses display scaling, like 125% or 150%, so websites see a smaller size in CSS pixels. This page multiplies by the scaling to show the real pixels.

What is the device pixel ratio?

How many real pixels the screen uses for one CSS pixel. 1 means no scaling, 1.25 means 125% scaling, and 2 or 3 is normal for Retina screens and phones.

What is the difference between screen size and viewport size?

The screen size is the whole display. The viewport is only the inside of the browser window, without tabs, address bar and taskbar.

Is the refresh rate exact?

No, it is a quick estimate from about one second. A busy computer can show a lower number. For a careful check, use the Refresh Rate Test.

Does this work with two monitors?

Yes. It shows the screen the browser window is on. Move the window to the other monitor and the numbers change within a second.

Good to know

• Browsers cannot see the size of a screen in inches, only pixels
• Some browsers with strong privacy settings round or hide some values
• Nothing on this page is saved or sent anywhere

Related tools

• Refresh Rate Test — measure your screen's Hz exactly
• Screen Test — find dead pixels and backlight bleed
• Online Ruler — measure things in real centimetres and inches
• What Is My IP — see your IP address and browser details
• Mouse Test — check every mouse button and the scroll wheel