About the Screen Resolution Tester
Designing websites or testing display settings? It's often necessary to know your exact screen and viewport dimensions. Our tool instantly detects and displays your monitor's physical resolution along with your browser's current window size.
Key Metrics Explained
- Screen Resolution: The total physical pixels your monitor can display (e.g., 1920x1080).
- Viewport Size: The actual visible area within your browser window, excluding toolbars and scrollbars.
- Color Depth: The number of bits used to indicate the color of a single pixel. Higher means more colors.
- Pixel Ratio: The ratio of physical pixels to logical pixels. High-DPI displays usually have a ratio of 2 or 3.
Use Cases
- Validate data formats quickly while debugging APIs and integrations.
- Confirm hardware and viewport behavior during QA checks.
- Reduce context-switching by running diagnostics directly in the browser.
Frequently Asked Questions
Why is my viewport size smaller than my screen resolution?
Your screen resolution represents the total hardware pixels of your physical monitor. Your viewport size only represents the inner browsing area of your window, subtracting the space taken up by taskbars, browser tabs, bookmarks bars, and scrollbars.
Why does my high-resolution Mac screen show a lower resolution?
Apple Retina displays (and modern Windows high-DPI screens) group physical pixels together to render sharper text, which creates "logical" pixels. If a MacBook has a 2560x1600 physical resolution but a pixel ratio of 2, the browser interprets the viewport based on the logical 1280x800 resolution.
Does changing zoom affect the viewport?
Yes. When you zoom in using your browser, the logical pixels scale up, which forces the viewport width and height to shrink so content can fit elegantly.
How reliable are the calculated results in this tool? (What is my Screen Resolution?)
This tool applies deterministic formulas to the exact inputs you provide, so the same input always returns the same output. Accuracy depends on input quality and on how closely real-world conditions match the model assumptions shown below the result. Use the output as structured decision support, then validate with project-specific constraints when stakes are high.
Are my inputs saved or sent to a server? (What is my Screen Resolution?)
Calculations run locally in your browser session for immediate feedback, and no manual form submission is required. If you use export actions, files are generated and downloaded on your device. For sensitive workflows, you can still clear the form and browser data after use.
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