🖥️Screen Resolution Checker
Your display details, detected instantly — no input needed.
Note: Values are in CSS pixels as reported by your browser. On high-DPI displays, OS scaling means the screen resolution shown here may differ from your monitor's native panel resolution — that's expected. The "Actual Pixels" row shows the physical pixel count your browser uses (viewport × DPR).
Free Screen Resolution Checker — What Is My Screen Resolution?
Wondering what your screen resolution actually is? Our free screen resolution checker detects it instantly — no input needed. The moment the page loads, it shows your display's resolution, your browser's viewport size, the device pixel ratio, color depth, orientation, and your screen's aspect ratio, all in one clear readout.
It also explains the differences that usually cause confusion: your screen resolution isn't always the same as your browser's viewport, and high-density displays report a pixel ratio that affects how sharp everything looks. Resize your window or rotate your device and the numbers update live, so you can see exactly how your viewport changes. It's handy for web designers checking breakpoints, gamers and shoppers confirming a display, or anyone troubleshooting how a site or video looks on their screen. One click copies everything to share or note down.
Just open the page to see your screen details instantly. No sign-up, no downloads, no limits — just the facts about your display.
About the Screen Resolution Checker
What it detects
Screen Resolution
The total size of your display in CSS pixels, from screen.width × screen.height. Stays the same when you resize your browser window.
Browser Viewport
The visible area of the web page inside your browser window, from window.innerWidth × innerHeight. Changes as you resize the window.
Actual Pixels
Physical pixel count your browser uses — viewport multiplied by the device pixel ratio. More relevant than CSS pixels for rendering and display quality.
Device Pixel Ratio
How many hardware pixels map to one CSS pixel. Standard displays report 1; Retina and HiDPI displays report 2 or higher, which produces sharper rendering.
Color Depth
Bits per pixel your display supports, from screen.colorDepth. Most modern displays report 24-bit or 30-bit.
Orientation
Whether your device is in portrait or landscape mode, from the Screen Orientation API with a fallback to comparing width and height.
Aspect Ratio
Your screen's width-to-height ratio simplified to its smallest whole-number form (e.g. 1920×1080 → 16:9), computed via the greatest common divisor.
Available Area
The usable screen area excluding OS-reserved space like the taskbar, from screen.availWidth × availHeight.
CSS pixels vs. physical pixels
Modern operating systems let users set a display scale factor (e.g. 150% on Windows, 200% on Mac Retina). This means your browser reports screen dimensions in CSS pixels, which are smaller than your panel's native hardware pixel count. A 4K monitor set to 200% scaling appears as 1920×1080 in CSS pixels, not 3840×2160. The tool reports what your browser sees and clearly labels everything so there's no confusion.
Who it's for
Web designers
Verify viewport breakpoints instantly without digging into DevTools.
Developers
Check DPR and actual pixel counts when building responsive or canvas-based UIs.
Gamers & shoppers
Confirm a display's reported resolution before buying or configuring a game.
Frequently Asked Questions
How does the screen resolution checker work?
It reads the display information your browser reports — screen.width, screen.height, window.innerWidth, window.devicePixelRatio, and related APIs — and shows it instantly. No input or downloads are needed.
Is the screen resolution checker free?
Completely free. No sign-up, no downloads, no limits.
What's the difference between screen resolution and viewport size?
Screen resolution is the total size of your display as the browser sees it. The browser viewport is just the visible area of the web page inside your window, which is usually smaller because the browser's own UI (tabs, address bar) takes up space.
What is device pixel ratio (DPR)?
Device pixel ratio tells you how many physical (hardware) pixels map to one CSS pixel. On standard displays it's 1. On high-density (Retina or HiDPI) screens it's typically 2 or higher, which makes text and images look sharper.
Why doesn't the number match my monitor's advertised resolution?
Browsers report sizes in CSS pixels, not raw panel pixels. OS display scaling (e.g. 150% on Windows, 2× on Mac Retina) means the CSS pixel count is divided down from the hardware resolution. The "Actual Pixels" row multiplies the viewport by DPR to show the physical pixel count your browser uses.
Does it update if I resize my browser window or rotate my device?
Yes. The tool listens for window resize and orientationchange events, so all values update live the moment your window size or device orientation changes.
What else does it show besides screen resolution?
It shows browser viewport size, actual physical pixels (viewport × DPR), device pixel ratio, color depth (bits per pixel), orientation (portrait or landscape), screen aspect ratio (e.g. 16:9), and available screen area — the usable area excluding the OS taskbar.
Can I copy the results?
Yes. Click the "Copy all" button to copy every detected value to your clipboard in a clean, labelled format — ready to paste into a document or share.
Is any of this information sent to a server?
No. Everything is detected and displayed locally in your browser using JavaScript browser APIs. Nothing is stored, logged, or sent anywhere.
Does it work on mobile?
Yes. The tool is fully responsive and detects your mobile device's values — screen size, viewport, DPR, and orientation — without any overflow or layout issues.