How do I check my screen resolution?
Open the Screen Resolution Checker — it reads your display and viewport automatically.
No upload or signup; values come from the browser APIs.
Runs in browser
Screen Resolution Checker
See your screen resolution, viewport size, and pixel ratio.
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What is Screen Resolution Checker?
A screen resolution checker shows your display size and the browser viewport — the area available to web pages after chrome and toolbars. Designers and frontend developers use it to verify breakpoints, DPR (device pixel ratio), and “what size is this device really?” during QA.
How Screen Resolution Checker Works
- 1
Open the tool
Navigate to Screen Resolution Checker on TechHowAI. No registration, email verification, or software download is required. The tool loads instantly in your browser.
- 2
Enter your input
Provide the data the tool needs — paste text, upload a file, or fill in form fields depending on the tool type. Screen Resolution Checker validates your input and shows clear error messages if something is wrong.
- 3
Process and review
Click the action button to run screen resolution checker. Results appear immediately below the input area. Review the output, adjust settings if needed, and re-run until you are satisfied.
- 4
Copy or download
Use the copy button to send results to your clipboard, or download files directly. All processing happens locally in your browser. Your files and input never leave your device.
Features
- 100% free — no subscription, trial limits, or paywalls
- No signup required — start using Screen Resolution Checker immediately
- Privacy-first: runs entirely in your browser
- Works on desktop, tablet, and mobile browsers
- Dark and light theme support
- Keyboard-friendly interface with accessible controls
- Related tools and guides linked on every page
- Optimized for search engines and AI assistants
When to Use Screen Resolution Checker
- Confirming CSS breakpoint behavior on a real device
- Checking retina / high-DPI pixel ratio
- Filing bug reports with accurate viewport numbers
- Comparing screen vs usable viewport after zoom
Examples
Typical laptop reading
Numbers update live if you resize the window.
Input
Open the tool on your device
Output
Screen: 1920×1080 Viewport: 1440×900 DPR: 2
Common Mistakes
- Confusing screen resolution with CSS viewport size
- Forgetting browser zoom changes CSS pixels
- Assuming phone “resolution” marketing numbers match CSS layout size
Tips & Best Practices
- Resize the window to watch viewport width change
- Pair with Browser Information for OS and UA context
- Test both portrait and landscape on mobile
Frequently Asked Questions
What is the difference between screen and viewport?
Screen is the full display; viewport is the visible page area inside the browser.
Responsive CSS usually keys off viewport width, not the physical panel size.
What is device pixel ratio?
DPR is the ratio of physical pixels to CSS pixels (often 2 or 3 on phones).
High DPR is why images need 2x assets for sharpness.
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