Resolution Checker
Live- Physical = actual panel pixels
- Logical = physical ÷ OS scaling
- DPR 2.0 = Retina-class rendering
- 125/150% scaling may add slight blur
- HDMI 1.4 — 4K@30Hz max
- HDMI 2.0 — 4K@60Hz
- HDMI 2.1 — 4K@120Hz / 8K@60
- DP 1.2 — 4K@60
- DP 1.4 — 4K@120 / 8K@30
- DP 2.1 — 4K@240 / 8K@120
Professional Resolution Checker
Automatic reading
All parameters from screen and window APIs on page load — zero interaction needed.
Spec comparison bars
Your pixel count visualized against HD/FHD/QHD/4K.
Live refresh rate
rAF-sampled refresh rate judges link bandwidth alongside resolution.
Resolution Essentials
Physical vs logical
Physical is panel pixels; logical is the scaled workspace — screenshots and designs use logical.
DPR
devicePixelRatio: physical pixels per logical pixel. 2.0 = 4x pixel rendering, razor-sharp text.
Native resolution
LCDs are sharpest at native resolution; anything else interpolates and blurs. Always set native.
How to Use
Open the page
Everything reads automatically — no clicks needed.
Compare specs
See where your pixel count sits between HD and 4K.
Check scaling
Logical ≠ physical means scaling is on; tune it per our advice.
Common Resolutions
HD 1280×720
0.92 MP
- + Power efficient
- − Visible pixels
FHD 1920×1080
2.07 MP
- + Mainstream
- − Coarse above 27"
QHD 2560×1440
3.69 MP
- + 27" sweet spot
- − +78% GPU load
UHD 3840×2160
8.29 MP
- + Ultra sharp
- − Needs scaling
Optimization Tips
For 4K on Windows use 150% scaling; macOS Retina handles it automatically.
If 4K gaming is too heavy, DLSS/FSR beats dropping resolution.
Mixed-DPI multi-monitor: Windows 11 supports per-display scaling.
Confirm games support 21:9 on ultrawide — side black bars are normal otherwise.
FAQ
Detection Notes
- Reads the screen the browser window is on
- Multi-display: drag the window over and refresh
- Maximize the window for accurate logical size
- Refresh after changing OS scaling
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