Web tools
Device Pixel Ratio Checker
Read the current devicePixelRatio and understand the relationship between device pixels and CSS pixels.
Current readings
These readings stay in your browser. This tool does not save them, create an identifier or transmit a report.
What device pixel ratio means
A ratio of 2 means one CSS pixel nominally spans two device pixels along each axis, or four over an area. A 100 CSS-pixel length therefore corresponds to 200 device pixels at that ratio. Fractional ratios are valid.
Browser page zoom and operating-system display scaling can change devicePixelRatio. Pinch zoom changes visual viewport scale without changing this ratio. Moving between displays may also change it. The value does not reveal a screen’s physical size, exact DPI or native panel resolution. Live updates listen for display changes and refresh while this page is visible; pause them to keep a snapshot.