What is my screen resolution?
Instantly read your screen's native resolution, browser viewport size, aspect ratio and orientation. The values update live as you resize the window, and everything is read in your browser — nothing is uploaded or stored.
—
Physical estimate — (includes devicePixelRatio)
—
Orientation: —
—
—
—
—
—
—
—
—
Tip: press F11 for fullscreen or rotate your device to watch these values change live.
100% local — nothing leaves your device
How to use it
- 1 Open the page — your screen resolution and viewport size appear instantly, no permission needed.
- 2 Read the native resolution (with devicePixelRatio), CSS viewport size, aspect ratio and orientation.
- 3 Resize the window or rotate your device to watch every value update live.
- 4 Note your native resolution for display, game, streaming or support settings.
Troubleshooting
Screen resolution shows the wrong size on Windows 11
Browsers report logical pixels scaled by your display setting. On Windows 11, open Settings, System, Display and check the Scale value (often 125% or 150%). Multiply the reported width and height by devicePixelRatio, shown on this page, to get the true native pixel resolution of your monitor.
Resolution looks too small on a Mac or Retina display
Retina and other high-density screens pack several physical pixels into one CSS pixel. The native resolution shown here already multiplies the reported size by devicePixelRatio. If it still looks low, open System Settings, Displays and switch from a scaled mode to the full native resolution.
Viewport size differs from screen resolution in Chrome
That is expected. Screen resolution is your whole monitor, while the viewport is only the area the web page can draw in. Toolbars, the taskbar, window borders and browser zoom all shrink the viewport. Maximize the window and reset zoom to 100% to make the two values closer.
Resolution does not update when I rotate my Android phone
Most modern browsers update instantly on rotation, but some need a moment or a tab refresh. Make sure auto-rotate is enabled in your device quick settings, turn the phone fully sideways, then reload the page. The width, height and orientation values will then reflect the new layout.
Frequently asked questions
Is anything uploaded or recorded?
No. Everything runs locally in your browser. The tool only reads values your browser already exposes, such as screen.width, window.innerWidth and devicePixelRatio. Nothing is saved, sent to a server, or shared.
What is my screen resolution right now?
The page reads it for you the moment it loads. The native resolution is your monitor's physical pixel count, calculated from the reported screen size multiplied by devicePixelRatio for high-density displays.
Why is the resolution different from my monitor's advertised size?
Browsers report logical (CSS) pixels affected by your operating system's display scaling. Multiplying by devicePixelRatio, shown on this page, gives the true native resolution that matches your monitor's specification.
What is the difference between screen resolution and viewport size?
Screen resolution is your entire monitor. Viewport size is only the part of the window where the web page is drawn, which is smaller because of browser chrome, the taskbar and any zoom you have applied.
Does it work on mobile and which browsers are supported?
Yes. It works in any modern browser — Chrome, Edge, Firefox, Safari and Opera — on desktop and mobile. It uses standard Screen and Window properties supported everywhere, with no permission or install required.