Screen Resolution Online is a small, focused tool: open the page, and it tells you your device's screen resolution, your current browser window size, and the aspect ratio of both — instantly, with nothing to install and nothing to configure.
What we do
We built this site to answer one question quickly and accurately: "what resolution is this screen?" Whether you're comparing a new monitor to the one it's replacing, setting up a display for gaming or design work, or just troubleshooting why a website looks wrong, the numbers you need are on the page the moment it loads.
How the numbers are calculated
Every figure on this site comes from standard, well-documented browser APIs — the same information your browser already uses to draw the page. Device resolution comes from your screen's reported dimensions, browser window size from the current viewport, and aspect ratio is calculated by reducing width and height to their simplest whole-number ratio, matched against common industry standards like 16:9 and 21:9 where they apply.
Who it's for
- Designers and developers checking how a layout behaves at a specific viewport size
- IT and support teams asking a user for their exact display specs
- Gamers and shoppers comparing monitor or phone specs before buying
- Anyone who's ever wondered "what resolution is my screen, exactly?"
Accuracy & updates
The live readout is pulled directly from your device, so it's always accurate to the browser you're using. Our reference tables of common resolutions are reviewed periodically and updated as new displays and devices become widely used.
Questions or feedback
If something looks wrong or you'd like to suggest a resolution we're missing from the reference table, we'd like to hear about it — see the Contact page.