Viewport Size Checker
Read viewport size, screen size, DPR, orientation, and breakpoint context in one place. The page is written for developers and QA teams who need a copyable browser report.
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Viewport Width × Height (px)
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Width
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Height
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Aspect Ratio
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Screen Width
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Screen Height
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Pixel Ratio
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Orientation
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CSS Breakpoint
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Physical Pixels
How to Use Viewport Size
- Open the page on the device or browser window you want to inspect.
- Resize or rotate the screen and watch the values update.
- Copy the readings as JSON, Markdown, or a bug-report link when available.
Features
- Live viewport and screen size readout
- Device pixel ratio and orientation context
- Breakpoint language for common CSS frameworks
- Resize history for QA notes
- Copy-friendly report formats
Viewport Size Checker: practical uses
Read viewport size, screen size, DPR, orientation, and breakpoint context in one place. The page is written for developers and QA teams who need a copyable browser report. The refreshed page copy keeps the main task first while giving Google and users clearer context for free online viewport size checker searches.
Why it helps
- Best for: Live viewport and screen size readout
- Privacy: The page keeps the privacy message close to the working area.
- Next step: Review the result, then copy, download, share, or continue with a related workflow.
Frequently Asked Questions
What is the difference between viewport and screen resolution?
Screen resolution is the physical number of pixels your entire monitor has (e.g. 1920×1080). Viewport is the visible area inside your browser window — it changes as you resize the window or scroll bars appear. Viewport is always smaller than or equal to screen resolution.
What is Device Pixel Ratio (DPR)?
DPR is how many physical pixels make up one CSS pixel. Retina/HiDPI displays have DPR of 2 or higher, meaning 4× more physical pixels per CSS pixel. This is why high-DPI images look sharper on Retina displays.
