Screen resolution
Measuring…
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Live browser diagnostic
Screen Resolution Checker
Find the physical pixel grid reported by your current display and copy it for QA notes.
Current screen resolution
Measuring…
The physical pixel grid reported by your display.
Physical pixels
Reported by the display/browser.
Useful for QA
Attach to screenshots and bug notes.
Not the same as CSS
Viewport can be smaller.
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Full diagnostics
Detailed browser, display, viewport, DPR, OS, orientation, color depth, and refresh-rate values.
Current viewport
Measuring…
This is the CSS viewport your website sees.
Device pixel ratio
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Browser
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Operating system
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Visual viewport
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Orientation
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Color depth
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Refresh rate
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Zoom/scaling note: Checking…
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How to use this result
Screen resolution is the physical pixel grid reported by the device. It is useful for QA notes, device screenshots, and display troubleshooting.
Remember that CSS viewport size can be smaller than the physical resolution because browsers, scaling, and DPR change how pages are rendered.
Privacy note
This screen checker runs in your browser. It does not require signup, file uploads, or personal account data to show your screen metrics.
Screen metric guide
How screen resolution differs from viewport
Screen resolution tells you the physical pixel grid of the display. It is useful, but it does not always match the CSS viewport used by a website.
Display troubleshooting
Use resolution values when checking monitor settings, screenshots, external displays, or scaling issues.
CSS rendering context
A high-resolution display can still report a smaller CSS viewport because browsers and operating systems scale the page.
Better bug reports
Copy resolution together with viewport and DPR so the report has both physical and CSS context.
Frequently asked questions
What does screen resolution mean?
It is the number of physical pixels reported for the screen width and height.
Why is my resolution not equal to my browser width?
The browser viewport is affected by window size, browser UI, zoom, scaling, and DPR.
Can this detect my monitor size in inches?
Browsers do not reliably expose physical diagonal size, so this checker focuses on pixel measurements.
Is screen resolution useful for responsive design?
It is useful context, but viewport width is usually the key value for responsive CSS.
Helpful references
Related screen diagnostics resources
Use these pages when diagnostics need screen size, viewport, monitor, device, or comparison context.
Check live values
Live screen details
Check live screen resolution, viewport size, DPR, browser, OS, and display details.
Viewport Size Checker
Measure the CSS viewport width and height your webpage can use right now.
Screen Resolution Checker
Find the physical pixel grid reported by your current display.
DPR Checker
Check device pixel ratio for retina assets, screenshots, and layout debugging.
Measure and compare
Screen Size Calculator
Calculate monitor width, height, area, aspect ratio, and PPI from diagonal size and resolution.
How to Measure Screen Size
Measure a monitor, laptop, TV, phone, or tablet diagonally without including the bezel.
27-Inch 4K Monitor
Check 27-inch 4K panel dimensions, 163.18 PPI, pixel pitch, and scaling behavior.
Screen Size Comparison
Compare phones, tablets, laptops, monitors, and TVs by viewport, resolution, DPR, and PPI.
Device references
Device Viewport Database
Search viewport, DPR, resolution, diagonal size, and PPI references.
iPhone Viewport Sizes
Open iPhone CSS viewport, screen size, resolution, and DPR references.
MacBook Screen Sizes
Compare MacBook logical viewport, resolution, DPR, diagonal size, and PPI.
Monitor Screen Sizes
Review 1080p, QHD, 4K, and ultrawide monitor references.
Guide collection
Related guides
Use these supporting guides to understand the tool result and next testing steps.
Related tools
Continue with another ScreenMetricLab utility.
Need more screen sizing help? Explore device viewport sizes, compare popular screens, or read our screen and viewport guides.