WHAT IS MY SCREEN SIZE?

Your screen resolution, browser viewport, pixel ratio, aspect ratio and more — detected instantly using your browser. Nothing is sent to any server.

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● Live
Screen Resolution
—
pixels (width × height)
Detecting…
Browser Viewport
—
inner window (px)
Device Pixel Ratio
—
standard / retina
Aspect Ratio
—
—
Color Depth
—
bits per pixel
Pixel Depth
—
bits per pixel
Est. Diagonal
—
approx. inches
Detecting live — try resizing your window

Common Screen Resolutions Explained

Name Resolution Aspect Ratio Common Usage
HD (720p)1280 × 72016:9Budget laptops, older monitors, HD video
Full HD (1080p)1920 × 108016:9Most common — laptops, monitors, TVs
QHD / 2K2560 × 144016:9Gaming monitors, high-end laptops
4K UHD3840 × 216016:9Professional monitors, modern TVs
MacBook Air (M2)2560 × 1664~16:10Apple MacBook Air 13"
MacBook Pro 14"3024 × 1964~16:10Apple MacBook Pro 14"
iPhone 15 Pro2556 × 1179~19.5:9Apple iPhone 15 Pro
iPad Air (2024)2360 × 1640~10:7Apple iPad Air M2
Ultrawide3440 × 144021:9Curved ultrawide monitors
XGA1024 × 7684:3Older projectors, legacy monitors

Why Check Your Screen Size?

Web Developers

Check your viewport before writing CSS media queries. Verify breakpoints at 768px, 1024px, 1280px match your test environment. Identify if you're testing on a HiDPI screen where 1 CSS pixel ≠ 1 device pixel.

Designers

Confirm your canvas size matches your target resolution. Check DPR to decide whether to export assets at 1x, 2x, or 3x. Verify aspect ratios for video thumbnails, banners, and social media graphics.

Gamers

Verify your native resolution before setting in-game display options. Identify if your monitor supports 1080p, 1440p, or 4K natively. Check aspect ratio for ultrawide compatibility.

Remote Support

Share your screen resolution with IT support or developers to help them reproduce display issues. Useful when reporting bugs related to layout, scaling, or HiDPI rendering problems.

Content Creators

Check what resolution your recording or streaming window will capture. Set OBS, Camtasia, or screen recording tools to match your viewport. Export at the right resolution for YouTube or social platforms.

Buyers & Sellers

Verify a monitor's actual resolution before or after purchase. Check that the resolution reported by your OS matches the manufacturer's specification. Useful for second-hand display verification.

Frequently Asked Questions

What is screen resolution?
Screen resolution is the number of pixels your display can show, expressed as width × height. A resolution of 1920 × 1080 (Full HD) means 1,920 pixels across and 1,080 pixels down. Higher resolution means more pixels, sharper images, and more content visible at once.
What is the difference between screen resolution and browser viewport?
Screen resolution is the total number of pixels your physical display hardware can render. Browser viewport is the visible area inside your browser window — it is smaller because it excludes the OS taskbar, browser chrome (address bar, tabs, toolbars). Web developers use the viewport size for responsive design media queries, not the full screen resolution.
What is Device Pixel Ratio (DPR)?
Device Pixel Ratio (DPR) is the ratio of physical pixels to CSS pixels. A DPR of 2 means your device uses 2 physical pixels for every 1 CSS pixel — this is what Apple calls a Retina display. A DPR of 1 is a standard display. High DPR screens (2×, 3×) appear sharper because more physical pixels occupy the same space.
How is screen diagonal size calculated?
Screen diagonal in inches is estimated using the Pythagorean theorem on pixel dimensions divided by PPI (pixels per inch). Because browsers do not expose true physical DPI directly, the estimate uses window.devicePixelRatio and CSS pixel density. The result is approximate and may differ slightly from the manufacturer's stated screen size.
What is aspect ratio and why does it matter?
Aspect ratio is the proportional relationship between screen width and height, expressed as W:H. Common ratios are 16:9 (widescreen standard for HD and 4K), 4:3 (older monitors and iPad), 21:9 (ultrawide), and 16:10 (MacBook). Aspect ratio matters for video production, game development, and ensuring UI designs display correctly across devices.
What does color depth mean?
Color depth (also called bit depth) is the number of bits used to represent the color of a single pixel. A color depth of 24 bits supports 16.7 million colors (True Color). Most modern displays use 24-bit or 32-bit color. Higher color depth means smoother gradients and more accurate color reproduction.
Is my screen data sent to a server?
No. All screen detection uses JavaScript browser APIs — window.screen, window.innerWidth, window.devicePixelRatio — that read data directly from your device. No data is transmitted to FindBeam's servers or any third party. Your screen information never leaves your browser.
Is this screen size detector free?
Yes. FindBeam's Screen Size Detector is completely free with no account, no registration, and no usage limits. It works on any device and browser. It will remain free.