Display
Device Pixel Ratio Checker
Check your device pixel ratio (DPR). Find out your screen pixel density and Retina display scaling factor.
Live Result
Detecting…
What is it?
Device Pixel Ratio (DPR) is the ratio between physical pixels on your hardware screen and logical CSS pixels used by your browser. A DPR of 2 means each CSS pixel actually maps to a 2×2 grid of physical pixels.
Why this matters
DPR affects image sharpness, font rendering, and canvas element resolution. Developers must serve higher resolution assets (like @2x or @3x images) for high-DPR screens, otherwise graphics will appear blurry.
Practical Use Cases
- Web Developers determining if they need to serve higher-resolution WebP/AVIF images to a client.
- Graphic Designers verifying if a monitor supports Retina display scaling for pixel-perfect design work.
- Troubleshooting blurry HTML5 Canvas or WebGL rendering on high-end laptops.
Common values
| Label | Value |
|---|---|
| Standard display | 1 |
| Retina / HiDPI | 2 |
| High-end mobile | 3 |
Troubleshooting
DPR shows 1 on a Retina Mac
Ensure browser zoom is at 100%. Zoom levels can affect reported DPR in some browsers. Also ensure you are not using an external non-Retina monitor.
Frequently asked questions
What is device pixel ratio?
Device pixel ratio is the mathematical ratio between physical pixels on your screen and the logical pixels your operating system uses to draw interfaces.
What DPR is considered Retina?
A DPR of 2 or higher is generally considered a Retina or HiDPI display by modern standards.
Related Tools
Explore more diagnostics
Visit the DeviceScope homepage for a complete live dashboard, or browse all tools in the Display category.