Responsive design sounds simple until you’re staring at a layout that looks perfect on your laptop and breaks on an iPhone 6 or a Galaxy Tab from 2014. Real users don’t all share the same screen. They’re on old phones, new tablets, scaled laptops, and ultrawide monitors—and your site has to work on all of them.
Website Resolution Tester is a free, browser-based tool that lets you preview any website at exact device viewport sizes. No installs, no accounts, no complicated setup. Paste a URL, pick a resolution (or several), and see how your site actually renders.
Try it here: codefrydev.in/WebsiteResolutionTester
What is Website Resolution Tester?
Website Resolution Tester is a minimal viewport testing tool built for developers, designers, and anyone who ships websites. You enter a URL, choose a width and height (or use built-in device presets), and the tool opens your site in a precisely sized popup window—so you see the layout as it would appear on that device’s browser.
It covers screen sizes from 2014 through today, from the iPhone 4 to the iPhone 17 line, popular Android handsets, iPads, Surface devices, and common desktop resolutions.
Who is it for?
- Web developers checking breakpoints and responsive behavior before deploy
- UI/UX designers validating layouts across real-world device sizes
- QA testers comparing how a site looks on multiple viewports in one session
- Freelancers and agencies showing clients how a site behaves on phone vs. desktop
- Anyone who wants a quick, honest look at mobile-friendliness without heavy tools
If you’ve ever resized your browser window and hoped that was “close enough,” this tool gives you something better: exact logical viewport dimensions—the same CSS pixels a real device browser would use.
Key features
1. One-click device presets
Instead of memorizing dimensions, pick from organized presets:
- Desktop — 1080p, 1440p, common laptop sizes (1366×768, 1280×800), and more
- Tablet — iPad Pro, iPad Air, iPad Mini, Galaxy Tab, Surface Pro, Nexus 7, and others
- Mobile (Android) — Galaxy S-series, Pixel, and common Android viewport buckets
- iPhone — iPhone 4 through iPhone 17 (including Pro, Pro Max, and Air sizes)
Tap a preset to load its resolution, or check multiple presets and launch them all at once.
2. Custom resolutions
Need a specific size? Enter any width × height in CSS pixels. A rotate button swaps portrait and landscape in one click.
3. Batch testing
Select several presets, hit Launch selected, and open multiple sized windows side by side. Compare how navigation, hero sections, and forms behave across devices without switching tools.
4. Test localhost and staging sites
Building locally? Enter localhost:3000 (or your dev server URL) and preview your work in progress. The tool runs entirely in your browser—your local environment stays on your machine.
5. Shareable test links
Copy a share link that includes your target URL, resolution, and selected presets. Send it to teammates so everyone opens the same test setup.
6. Privacy-first
Your URL is not sent through a proxy server. The site opens directly in a new window on your computer, like a normal tab. Website Resolution Tester doesn’t fetch or store the pages you test—only your browser loads them.
7. Free to use
No subscription, no signup. Open the page and start testing.
Why logical resolution (CSS pixels) matters
Modern phones and laptops use high-DPI (Retina) screens: many physical pixels map to one “logical” pixel in the browser. Testing at logical resolution matches what users actually see—how text wraps, how buttons align, and how media queries fire. That’s more useful than raw physical pixel counts for everyday responsive work.
How to use it (quick start)
- Go to Website Resolution Tester
- Enter your site URL (e.g.
example.comorhttps://yoursite.com) - Pick a device preset or set custom width and height
- Click Launch Test
- If your browser blocks the popup, allow popups for the site—sized windows are how the tool simulates each device
Tip for mobile checks: Try an iPhone or Android preset and look for readable text without zooming, tappable buttons, and no horizontal scrolling.
When to reach for this tool
| Scenario | How it helps |
|---|---|
| Before a launch | Catch layout breaks on older iPhones and small Android screens |
| After a redesign | Compare desktop vs. tablet vs. phone in one sitting |
| Client reviews | Open several sizes at once for a live walkthrough |
| Local development | Test localhost without deploying to staging |
| Quick audits | Sanity-check mobile-friendliness in minutes |
What makes it different
Many browser dev tools can emulate devices, but they’re tied to one tab and one inspector. Website Resolution Tester is built for one job: open your real site in real, sized windows you can arrange on your desktop. It’s lightweight, focused, and covers a wide range of presets—including legacy devices people still use.
No bloat. No learning curve. Paste a URL, pick a size, and see the truth.
Try it today
Whether you’re polishing a landing page, debugging a navbar, or proving a site works from iPhone 4 to iPhone 17 Pro Max, Website Resolution Tester gives you a fast, accurate way to see your work on every screen that matters.
Open Website Resolution Tester →
Have feedback or want a preset added? The tool is maintained as a simple, focused utility—built for people who care how the web looks everywhere.