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See Your Website Through Every Visitor's Screen.
Your site must deliver a flawless experience whether viewed on a 27-inch desktop, a 13-inch laptop, a 10-inch tablet, or a 6-inch smartphone. A broken responsive design directly harms user engagement, increases bounce rates, and can negatively impact your mobile search rankings.
Test Instantly Across All Devices with Our Free Screen Resolution Simulator.
Stop guessing how your site looks on different devices. Our tool creates real-time viewports that simulate exact screen resolutions and device dimensions. Quickly identify layout breaks, unreadable text, or misaligned elements that could be driving visitors away.
Why Responsive Testing is a Core Pillar of Modern SEO & UX:
Mobile-First Indexing is Reality: Google predominantly uses the mobile version of your site for indexing and ranking. If your responsive design fails on key breakpoints, you're undermining your entire SEO strategy.
Directly Impact Core Web Vitals: Issues like Cumulative Layout Shift (CLS) are often caused by responsive elements loading incorrectly on specific screen sizes, hurting your performance scores.
Reduce Bounce Rates & Improve Conversions: A site that is difficult to navigate or read on a user's specific device will be abandoned immediately. A seamless responsive experience keeps them engaged.
Future-Proof Your Design: With countless devices and screen sizes, manual testing is impossible. Simulation allows you to proactively catch issues across a spectrum of common and edge-case resolutions.
From a Single URL to a Comprehensive Device Lab.
Our simulator provides a controlled environment to test interactively:
Pre-Set Device Profiles: Instantly test on exact viewports for iPhone, iPad, Samsung Galaxy, Desktop HD, and more.
Custom Resolution Control: Manually set any width/height in pixels to test specific breakpoints or unusual screens.
Interactive Throttling: Simulate different network conditions (3G, 4G) to see how your site loads under constraint on various screens.
Orientation Toggle: Switch between portrait and landscape modes to test tablet and mobile behavior.
Pixel Ruler & Overlay: Visually inspect element spacing and alignment directly in the simulated viewport.
Your Responsive Design QA Protocol:
Enter Your URL: Load the page you want to test (homepage, product page, checkout flow).
Select a Device Profile: Start with Mobile (375x812) – your most critical viewport.
Interact & Scroll: Navigate the site as a user would. Check for:
Horizontal scrolling?
Overlapping text/images?
Broken menus or buttons?
Properly scaled media?
Iterate Through Key Breakpoints: Test tablet, small laptop, and desktop. Use custom widths to test your design's specific CSS breakpoints.
Document & Fix: Note any failures and provide clear viewport-specific feedback to your developer or designer.
Critical For:
Web Designers & Front-End Developers: Debug CSS media queries and ensure pixel-perfect responsiveness before launch.
SEO Specialists & Digital Marketers: Verify that the site Google is ranking provides a perfect mobile user experience.
Product Managers & UX Designers: Validate that user flows and key interactions work seamlessly across all target user devices.
E-commerce Managers: Ensure product images, "Add to Cart" buttons, and forms are perfectly functional on every screen—where sales are won or lost.
Content Creators: Confirm that blog layouts, images, and embedded content reflow correctly for mobile readers.
Free, Browser-Based, and Immediate.
Professional responsive testing shouldn't require expensive lab setups or emulators. This simulator runs directly in your browser, is 100% free, and provides instant visual feedback. Your tested URLs are not stored or logged.
Don't Lose a Visitor Because of a Broken Viewport.
