A screen resolution checker instantly reveals how many pixels your display uses — for example, 1920×1080 means 1,920 pixels across and 1,080 down. You need that exact number when buying a monitor, troubleshooting blurry video calls, designing a website, or reporting a bug to tech support. Guessing wastes time and leads to wrong purchases; one click gives you the precise figure your device actually reports.
This free screen resolution checker detects your screen size, browser viewport, device pixel ratio, color depth, and orientation automatically. The numbers update live as you resize your browser window, every value has a one-click copy button for support tickets or design specs, and a built-in reference explains what labels like 1080p and 4K really mean. No signup, no downloads, no watermarks — everything runs in your browser.
Screen Resolution Checker
Your screen size, viewport, pixel density and more — detected instantly and updated live.
| Screen resolution | — | |
|---|---|---|
| Browser viewport | — | |
| Device pixel ratio | — | |
| Color depth | — | |
| Orientation | — | |
| Available screen area | — |
Common resolutions reference
| Label | Pixels | Typical use |
|---|---|---|
| HD (720p) | 1280 × 720 | Budget laptops, older displays |
| HD laptop | 1366 × 768 | Most common Windows laptop |
| Full HD (1080p) | 1920 × 1080 | Standard monitors, TVs |
| QHD (1440p) | 2560 × 1440 | Gaming and pro monitors |
| 4K UHD (2160p) | 3840 × 2160 | Premium TVs and monitors |
What does this mean?
Screen resolution is the full size of your display in pixels — width × height. Viewport is the smaller area your browser window actually gives to the web page; resize the window and watch it change live.
Device pixel ratio tells you how many physical pixels make up one CSS pixel. A ratio of 2 means a sharper Retina-style display. Color depth of 24-bit means about 16.7 million displayable colors.
🔒 100% private — everything runs in your browser, nothing is uploaded.
How to Use the Screen Resolution Checker
Using this screen resolution checker takes about five seconds — there is nothing to install and nothing to type:
- Open the page. The tool runs automatically the moment the page loads and reads your display values straight from the browser.
- Read the headline number. The big figure at the top is your screen resolution in pixels, with a plain-English label such as Full HD (1080p) underneath.
- Scan the specs table. Viewport size, device pixel ratio, color depth, orientation, and available screen area are listed with individual copy buttons.
- Copy what you need. Click any Copy button for a single value, or “Copy full report” to grab everything at once for a support ticket or message.
- Try resizing. Drag your browser window smaller or larger and watch the viewport row update live — handy when testing responsive layouts.
Because detection happens locally in your browser, the results reflect your actual current setup, including external monitors, zoom settings, and display scaling.
Features That Set This Tool Apart
Here is what makes this screen resolution checker genuinely useful day to day:
- Instant auto-detection — no buttons to press, no forms to fill; your specs appear the moment the page opens.
- Live viewport tracking — resize the browser and the viewport value updates in real time, which designers and developers love.
- Plain-English classification — instead of just “1920×1080”, you also see “Full HD (1080p)”, so the number actually means something.
- One-click copying — every row has its own copy button, plus a full-report button that formats everything neatly.
- Built-in reference table — compare your result against common resolutions from 720p to 4K without leaving the page.
- Zero tracking — the check runs entirely on your device; no value is ever sent to a server.
Understanding Screen Resolution: What the Numbers Mean
Screen resolution describes how many individual pixels your display can show, written as width × height. A pixel is the smallest dot of color your screen can produce, so 1920×1080 means the display draws 1,920 columns and 1,080 rows of these dots — just over two million pixels in total, often called “2 megapixels” of screen real estate.
More pixels generally means a sharper, more detailed image, because the same physical screen area is divided into finer dots. Text looks crisper, photos show more detail, and you can fit more windows side by side. That said, resolution is only one part of picture quality: panel technology, brightness, color accuracy, and viewing distance matter too. A well-made 1080p monitor can look better than a cheap 4K one.
One common point of confusion is that the number your operating system reports may differ from your monitor’s advertised maximum. Display scaling (Windows) or scaled resolutions (macOS) intentionally render at a lower effective resolution to keep text readable on high-density screens. A 4K laptop set to 200% scaling will report 1920×1080 to a screen resolution checker, because that is the effective resolution applications actually work with. This is the number that matters for web design, screenshots, and troubleshooting.
Color depth, another value this tool reports, tells you how many colors each pixel can display. The near-universal standard is 24-bit color — 8 bits each for red, green, and blue — which produces about 16.7 million colors. If you ever see 16-bit color (65,536 colors), gradients may show visible banding. Modern displays, phones, and laptops are essentially always 24-bit or higher, so this value is mostly a confirmation that everything is normal.
Common Screen Resolutions, From 720p to 4K
The labels 720p, 1080p, 1440p, and 4K come from television standards, where the number refers to the vertical pixel count (the “p” stands for progressive scan). In the computer world, the same panels are described by their full dimensions:
- 1280×720 (HD / 720p) — entry-level laptops, older monitors, and budget phones. Fine for basic browsing but noticeably coarse for design work.
- 1366×768 (HD laptop) — for years the single most common laptop resolution in the world. If your screen resolution checker shows this, you are in very large company.
- 1920×1080 (Full HD / 1080p) — the desktop standard for a decade: office monitors, televisions, and mainstream laptops. Still the sweet spot for readability and performance.
- 2560×1440 (QHD / 1440p) — popular with gamers and creative professionals who want extra sharpness without the cost of 4K.
- 3840×2160 (4K UHD / 2160p) — four times the pixels of 1080p. Superb for video editing and large monitors, though text and icons usually need scaling to stay readable.
Phones follow their own conventions because of tall aspect ratios — 390×844 (iPhone 12/13/14 class) and 412×915 (Android class) are typical CSS-pixel viewports, while the physical panels pack two to three times as many pixels. That multiplication is exactly what the device pixel ratio value in the tool describes.
When buying a monitor, match the resolution to the screen size and your viewing distance. A 24-inch 1080p monitor looks crisp on a desk; stretch 1080p across a 55-inch TV viewed from across the room and it looks equally fine, because your eyes cannot resolve individual pixels at that distance. Resolution only matters relative to how close you sit.
Screen Resolution vs. Viewport Size: What’s the Difference?
This distinction trips up almost everyone the first time they use a screen resolution checker, so it deserves a clear explanation. Screen resolution is a property of your hardware: the full pixel dimensions of the display itself. It does not change when you resize a window. Viewport size is a property of your browser window: the width and height, in CSS pixels, of the area currently available to the web page.
The viewport is almost always smaller than the screen resolution. Browser chrome (tabs, address bar, bookmarks bar), the operating system taskbar or dock, and any dev tools panels all eat into it. On a 1920×1080 screen with a maximized browser, you might see a viewport of 1920×950 — the missing 130 vertical pixels belong to the browser interface and the Windows taskbar.
For web designers and developers, the viewport is actually the more important number. Responsive websites rearrange themselves based on viewport width, not screen resolution — that is why this screen resolution checker updates the viewport live as you drag the window. A page that looks perfect on your maximized 1080p monitor might break at a 768-pixel-wide viewport, and the only way to know is to test that width directly.
There is a third related concept worth knowing: CSS pixels vs. device pixels. On a modern phone or Retina laptop, one CSS pixel (the unit web pages are laid out in) is rendered using multiple physical device pixels. A device pixel ratio of 2 means the browser draws everything at double density for extra sharpness, while layout math still uses the smaller CSS-pixel numbers. Screen resolution as reported here uses CSS pixels, which is the correct unit for web work. The official MDN documentation for the Screen API explains these properties in full technical detail.
Screen Resolution Checker: Frequently Asked Questions
What is my screen resolution and how do I find it?
Your screen resolution is the pixel dimensions of your display, written as width × height (for example, 1920×1080). The simplest way to find it is this screen resolution checker — it reads the value directly from your browser the moment the page loads, with no settings menus to dig through. On Windows you can also check under Settings → System → Display; on macOS, look under System Settings → Displays.
Why does the checker show a lower resolution than my monitor advertises?
Display scaling is the usual cause. Operating systems enlarge text and interface elements on high-density screens by rendering at a scaled-down effective resolution — a 4K laptop at 200% scaling reports 1920×1080. The checker shows the effective resolution, which is the number websites, screenshots, and applications actually use. Your monitor is still 4K; the OS is just making everything readable.
What is the difference between screen resolution and viewport size?
Screen resolution is fixed hardware — the full pixel count of your display. Viewport size is the smaller, changeable area your browser window gives to the web page after tabs, toolbars, and the taskbar take their share. Resize your browser and the viewport changes while the screen resolution stays the same. Web designers care most about the viewport, because responsive layouts respond to it.
What do 1080p, 1440p, and 4K actually mean?
These are shorthand labels for common resolutions. 1080p means 1920×1080 pixels (Full HD), 1440p means 2560×1440 (Quad HD), and 4K means 3840×2160 (Ultra HD) — the p stands for progressive scan, a legacy of TV standards. The bigger the numbers, the more detail the display can show. Our tool labels your detected resolution with the matching term automatically.
Is this screen resolution checker private? Does it work on phones?
Yes on both counts. The check runs entirely in your browser using standard display APIs — no measurement is uploaded, stored, or tracked anywhere, so it is safe to use on work machines. It works on phones, tablets, laptops, and desktops alike; on mobile you will typically see a tall portrait resolution and a device pixel ratio of 2 or 3, reflecting the high-density screen.
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Whether you are buying a monitor, debugging a layout, or filing a support ticket, knowing your exact display specs saves real time. Bookmark this screen resolution checker and the next time someone asks “what is your screen size?”, you will have the answer — with a copy button — in under five seconds.