Your screen, viewport and browser at a glance.
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Knowing the exact viewport size, device-pixel ratio and screen resolution of the device you are testing on is essential for responsive design and bug reproduction. This tool reports them in real time and updates as you rotate or resize. Use it to confirm a Retina display is doubling pixels, to capture the exact viewport for a screenshot, or to debug breakpoints that behave differently than expected.
Load the page — Screen Resolution is ready to use immediately, no login and no configuration required.
Enter, paste, or upload the data that Screen Resolution needs — the input area at the top guides you with a placeholder example.
Trigger the action; the result appears in the output panel within a second or two.
Use the copy or download button to grab the output for your workflow — nothing is stored on our servers.
Screen Resolution is built for people who want a fast, honest answer without wading through ads, sign-up walls, or feature bloat. Load the page, use the tool, get on with your day. Toolzer's design philosophy is simple: privacy-first (no tracking, no accounts), performance-first (the page is interactive in under a second on a 3G connection), and honesty-first (no fake ratings, no dark patterns, no upsells). Screen Resolution follows the same rules as every other utility on the site. You can bookmark this page, share the URL with a colleague, or pin it to your browser's toolbar — the experience will be identical every visit, and it will keep working even if you're on airplane Wi-Fi. Real people use this tool for real work — freelancers cleaning up client deliverables, sysadmins triaging tickets, students finishing assignments — and it is tuned for those workflows, not for demo videos.
Resolution is the physical pixel count of the screen. Viewport is the CSS-pixel space your page renders into, which is usually smaller because of the DPR scaling.
The ratio of physical pixels to CSS pixels. A DPR of 2 means each CSS pixel is rendered as a 2x2 block — that's why Retina images need to be 2x.
Landscape and portrait swap the dimensions and may trigger different media queries. Always test both orientations on mobile.
Modern responsive design targets 360, 768, 1024 and 1440 px as anchor points; design fluidly between them rather than for specific devices.
No. Every utility on Toolzer is free, anonymous, and works in any modern browser without registration.
Yes. Whenever the tool can produce an answer entirely in the browser, the data never leaves your device.
Yes. The interface is fully responsive and works on iOS Safari, Android Chrome, and every modern mobile browser.
Yes. Every Toolzer page has a clean permanent URL you can bookmark or share.
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