Check your screen's physical native resolution, scaled CSS resolution, aspect ratio, and Device Pixel Ratio.
Browser-reported information describes what your browser can see. It does not replace the monitor's manufacturer specifications or hardware measurement.
Enter your screen's physical size to estimate pixel density.
Also called CSS resolution, this is the grid your browser uses to render content. OS scaling and browser zoom can make this lower than your physical panel resolution.
The physical pixel grid built into your display panel. Running at non-native resolutions involves scaling and can make text appear softer.
DPR is how many physical device pixels are used to draw a single CSS pixel. A DPR of 2 means a 10x10 CSS box uses 20x20 physical pixels.
Pixel density (PPI) describes how many pixels are packed into each inch of the display. Higher PPI means sharper text and images, assuming the viewing distance is the same.
| Standard | Resolution | Approx. Pixels | Common Use |
|---|---|---|---|
| HD | 1280 × 720 | 0.9M | Older laptops, budget TVs |
| FHD | 1920 × 1080 | 2.1M | Standard monitors, laptops, TVs |
| QHD (1440p) | 2560 × 1440 | 3.7M | Gaming monitors, premium laptops |
| UWQHD | 3440 × 1440 | 5.0M | Ultrawide monitors |
| UHD / 4K | 3840 × 2160 | 8.3M | Premium monitors, modern TVs |
| 5K | 5120 × 2880 | 14.7M | Apple Studio Display, iMac |
| 8K | 7680 × 4320 | 33.2M | High-end specialized TVs/monitors |
Check OS display scaling (e.g., 150%). This reduces the logical resolution reported to the browser. Also check browser zoom settings.
Check that the OS output is set to 4K. If you are mirroring a lower-resolution laptop screen, the external monitor will look blurry.
Check your cable. Some high resolution + high refresh combinations require DisplayPort 1.4 or HDMI 2.1. Older cables may limit you to 60Hz.
Not reliably. Browsers see the logical resolution and scaling factor provided by the OS. If scaling is applied, the physical resolution cannot be guaranteed.
This is common on Windows laptops (e.g., 125% or 150% scaling) to make text readable on high-DPI screens without making everything tiny.
Browser frame timing is affected by system load, power saving, background tabs, and browser behavior. It is an approximation, not a direct hardware query.
