What is my screen resolution?

Check my screen resolution online: the free, instant tool

If you have ever typed “what is my screen resolution” into a search box, you are in the right place. This free online tool reads your display the moment the page loads and shows your resolution in pixels, with no download, no sign-up and no ads. The large number at the top of the page is your current width × height, for example 1920 × 1080, and it updates live if you resize the window or move it to another monitor.

Beyond the headline figure, the detector reports your browser viewport, available screen area, device pixel ratio, aspect ratio, orientation, colour depth, colour gamut, touch support and an estimated refresh rate. It is a complete screen resolution check for designers, developers, gamers and anyone setting up a new monitor, laptop or phone.

What is screen resolution?

Screen resolution is the number of pixels a display shows horizontally and vertically. A resolution of 1920 × 1080 means 1,920 pixels across and 1,080 pixels down, or about 2.07 million pixels in total. More pixels mean more room for windows and sharper text and images, as long as the panel is large enough to show the detail.

You will often see resolutions described by name: HD (1280 × 720), Full HD or 1080p (1920 × 1080), QHD or 1440p (2560 × 1440) and 4K UHD (3840 × 2160). Our screen resolution library lists each one with its aspect ratio, megapixel count and typical devices.

How to find your screen resolution

The quickest way is simply to read the number above. Your browser exposes your display size through standard web APIs, and this page presents it in plain language. If you would rather check in the operating system itself, here is where to look on each platform.

On Windows 10 (and Windows 8)

On Windows 10, right-click an empty area of the desktop, choose Display settings and look under Display resolution. The value marked "Recommended" is your monitor's native resolution. On Windows 8, right-click the desktop and choose Screen resolution. If the number shown here is smaller than the one you expected, Windows display scaling (125%, 150% or more) is probably the reason, because the browser reports the scaled, logical size.

On a Mac or MacBook Pro

Open the Apple menu, then System Settings → Displays. macOS shows a "looks like" resolution rather than the raw panel size. A 14-inch MacBook Pro, for instance, usually looks like 1512 × 982 while the Retina panel is physically 3024 × 1964. This page shows both, so you can read your Mac or MacBook Pro resolution without opening a menu.

On Android or a phone

Phones rarely expose a resolution setting, so the easiest route is to open this page in Chrome, Samsung Internet or Firefox. You will see the logical resolution in CSS pixels along with the physical pixel count. A phone that reports 412 × 915 may have a panel of 1080 × 2400 pixels, because the device pixel ratio is around 2.6. Browse the device database to compare popular phones and tablets.

On a Chromebook

On ChromeOS, open Settings → Device → Displays to see and adjust the resolution. Many Chromebooks run at a scaled setting by default, so the reading on this page is the logical size the browser actually uses to lay out web pages.

Screen resolution in pixels, ratio, DPI and pixels per inch

A resolution only tells part of the story. These related measurements explain how a screen actually looks:

• Screen resolution in pixels: the width and height of the display, such as 2560 × 1440.
• Screen resolution ratio: the shape of the display, shown as an aspect ratio like 16:9, 16:10 or 21:9. Try the aspect ratio calculator to resize anything while keeping its proportions.
• Screen resolution DPI and pixels per inch: pixel density, in other words how tightly the pixels are packed. A 27-inch 4K monitor has about 163 PPI, while a 27-inch 1080p monitor has roughly 82 PPI. Work yours out with the PPI calculator.
• Device pixel ratio: how many physical pixels sit behind one CSS pixel. It is the reason high-density "Retina" screens look so crisp. Our guide to device pixel ratio explains it in detail.

Note that PPI is the correct term for screens, while DPI technically refers to printed dots per inch. In everyday use, people search for both, and this site covers both.

Screen resolution size vs. viewport size

Your screen size is a different question from how big your browser window is. The screen resolution is the full display. The viewport is only the area where a web page is drawn, which excludes toolbars, tabs and the taskbar. Web developers design for the viewport, so the live diagram on this page shows how the two relate, along with the Tailwind and Bootstrap breakpoint you are currently in and ready-to-copy media queries.

Why your resolution may look different from what you bought

Buyers are sometimes surprised that a "4K" laptop reports 1920 × 1080 or 2560 × 1440. Operating systems scale the interface so that text stays readable on dense panels. The browser sees the scaled value, and multiplying it by the device pixel ratio gives the real panel resolution, which this page labels as "Physical pixels". Nothing is wrong with your display.

Who uses a screen resolution checker?

• Web designers and developers test responsive layouts and report exact viewport sizes in bug tickets.
• Gamers and video editors confirm that the display runs at its native resolution and refresh rate.
• Support teams use the copy and share buttons to collect a customer's specs in seconds.
• Everyday users pick the right wallpaper, screenshot size or video quality.

How to change your screen resolution

Pick the native resolution for the sharpest picture. On Windows, go to Display settings and choose the recommended value. On a Mac, open Displays and select a scaled option. If text looks blurry or too small, change the scaling rather than lowering the resolution. Our step-by-step guide on how to change your screen resolution covers every platform, and the comparison of 1080p vs 1440p vs 4K helps you choose a new monitor.

Private, accurate and fast

Every reading on this page is computed locally in your browser. Nothing about your screen is uploaded, logged or stored, which is why the tool works instantly and can be trusted on work machines. If something looks off, run the dead pixel test or the colour test to check the panel itself, or open the screen size comparison to see how two displays compare at true scale. Bookmark this page, and the next time you wonder what is my screen resolution, the answer will be one click away.