Instant detection of Resolution, Viewport, and Pixel Density.
No upload needed. 100% Client-Side.
Modern web browsing happens on a vast spectrum of hardware. From compact smartwatches to expansive 81-inch 8K professional displays, ensuring your content looks sharp depends on more than just "pixels."
Most modern smartphones have a Physical Resolution much higher than their Viewport Size. This is due to High-DPI (Retina) scaling, where multiple hardware pixels are used to render a single CSS pixel for maximum sharpness.
Your DPR indicates the multiplier between physical and virtual pixels. A DPR of 3.0 means a 3x3 grid of pixels is utilized for every design unit, essential for rendering crisp icons and typography on flagship devices.
Our Screen Size Checker provides an instant "Ground Truth" for developers and designers. By detecting your browser's specific viewport dimensions in real-time, you can verify if your media queries are firing at the correct breakpoints. This is particularly crucial for testing Foldables and Ultra-Wide monitors where window resizing can trigger unexpected layout shifts.
In 2026, accessibility is the primary driver of device standards. High-density displays allow for smaller, more legible text, but only if your CSS takes advantage of the available resolution. Testing your Screen Resolution isn't just about the width—it's about understanding the available canvas area for your user's eyes.
A perfect viewport is only half the battle. Ensure your text is perfectly counted and analyzed for readability on any screen.
Try Word CounterPhysical resolution refers to the total number of hardware pixels on your screen. Viewport size is the 'CSS pixels' used for layout. On high-DPI screens, several physical pixels are used to render a single CSS pixel for extra sharpness.
Designers and developers use it to verify breakpoints, test responsive layouts, and ensure that UI elements like text and buttons are appropriately sized across different devices.
Yes. All calculations and detection happen 100% client-side in your browser. No data about your screen or browser environment is ever sent to our servers.
You can use Browser DevTools (F12) to emulate different devices, or simply resize your browser window while observing the live updates in this tool.
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