Screen Resolution Size Detector

About

About Screen Resolution Size Detector

Screen Resolution Size Detector is a simple but powerful tool that helps developers, designers, testers, and everyday users see detailed information about their screen, browser, and device — instantly. No more using websites or DevTools just to check your resolution. Open the extension and everything appears in one clean dashboard.

Whether you're building responsive websites, testing UI layouts, comparing breakpoints, or switching between desktop and mobile previews, this extension gives you the tools you need in seconds.

 What This Extension Shows

✔ Screen Resolution (full device resolution)
✔ Viewport Size (actual available browser area)
✔ Device Pixel Ratio (DPR)
✔ Orientation (portrait / landscape)
✔ Color Depth
✔ Browser + OS detection (clean, simplified version — not full User Agent spam)
✔ Platform & Language

All information updates instantly with the Refresh Info button.

# Responsive Testing Tools

Quickly test your webpage in popular screen sizes:

Desktop Presets

1920 × 1080
1440 × 900
1366 × 768
1280 × 720

These presets resize your browser window to match the selected desktop resolution.

Mobile / iPhone Simulation
iPhone (414 × 896)
Mobile (375 × 812)

Instead of resizing your whole browser, the extension opens a sleek device simulator overlay that displays your current webpage inside a realistic mobile frame.
This allows you to test mobile layouts without losing your window size.

Includes:

- Auto-scaling so the device always fits the screen
- Close button to return to normal view
- Accurate viewport dimensions inside the device frame

# Why Install This Extension?

✔ No need to open DevTools for simple screen checks
✔ No need to visit websites like “What is my screen resolution”
✔ Perfect for designers testing UI responsiveness
✔ Perfect for developers debugging breakpoints
✔ Great for QA testers doing multi-device testing
✔ Clean interface, fast load, and no data collection

This extension is built with performance and accuracy in mind — everything runs locally on your browser.

# Privacy & Permissions

This extension does not collect or store any personal data.

Permissions used:

*activeTab — to detect your current tab for viewport info
*scripting — to safely run read-only scripts on the current page
*windows — required to resize the browser window for desktop presets
*tabs — needed to open new tabs (welcome page, website links)

All actions occur locally and no information is transmitted anywhere.

# Optional Website Tools

Enhance your experience with the official tool:

👉 https://whatismyscreenresolution.info

Includes advanced calculators:

- PPI Calculator
- DPI Checker
- Aspect Ratio Finder
- Browser Info Tool
- More tools coming soon.

# Updates & Improvements

- We continuously update:
- Device presets
- Simulator scaling accuracy
- Platform detection
- UI improvements

Suggestions are always welcome!