Display PPI / Resolution Detector
Pixel density, screen size, color depth — live
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Display PPI / Resolution Detector
Detect actual screen pixel density, viewport dimensions, color depth, DPR. Verify your "Retina" display is really delivering ≥220 PPI, not just marketing.
How to use this tool
- 1
Read live values
Resolution, DPR, color depth read instantly.
- 2
Enter screen diagonal
For PPI calculation, in inches.
- 3
See PPI
Apple Retina threshold ≈ 220+ PPI on laptops.
Frequently Asked Questions
What is DPR?
Device Pixel Ratio — physical pixels per CSS pixel. Retina displays = 2 (or higher). Standard = 1. CSS sees the lower count; canvas/images need DPR scaling.
Why is screen.width sometimes wrong?
Browsers report logical (CSS) pixels, not physical. Multiply by DPR to get physical resolution. Some platforms (Mac retina) lie further to look "natural".
How accurate is PPI calc?
Browser can't know diagonal in inches — must enter manually. Once entered, math is exact. Apple lists exact PPI for each model on their site.
You might also like
🔒
100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.