How to use
- 1
Open the page; values show at once.
- 2
"Physical pixels" is the monitor’s spec.
- 3
Move the window to check another monitor.
When to use it
Monitor specs
See if it is QHD or 4K.
Gaming
Estimate the refresh rate.
Web design
Check viewport and scaling.
Good to know
- 125%/150% scaling makes the CSS size smaller.
- QHD is 2560×1440; 4K is 3840×2160.
- Refresh rate is an estimate.
FAQ
Is my monitor 4K?
Yes if it shows 3840 × 2160.
Refresh rate low?
Enable high refresh in display settings.
Stored?
No.