ViewGrid — Responsive Viewer

Multi-viewport responsive web design & layout testing workspace with side-by-side device previews and synchronized scrolling.

Test every breakpoint at once. ViewGrid is a multi-viewport responsive testing workspace for frontend developers, designers, and QA engineers. Test mobile, tablet, laptop, and desktop layouts side-by-side in a single browser tab. Scroll, click, navigate, and compare multiple responsive viewports without constantly resizing Chrome DevTools. ★ RESPONSIVE TESTING • Multi-Viewport Workspace — Test multiple screen sizes simultaneously. • 21+ Device Presets — Preview popular phone, tablet, laptop, desktop, and foldable sizes. • Custom Viewports — Create your own width, height, and DPR combinations. • Portrait & Landscape — Switch orientation instantly. • Flexible Layouts — Arrange viewports in grid, row, or column layouts. ★ SYNCHRONIZED TESTING • Synchronized Scrolling — Scroll once and compare every breakpoint. • Interaction Sync — Mirror clicks and supported interactions across viewports. • Navigation Sync — Keep active previews on the same page while testing. ★ VISUAL COMPARISON & DESIGN QA • Figma Design Overlay — Overlay PNG or SVG design mockups on live pages and adjust opacity for visual comparison. • Split Comparison — Compare responsive layouts interactively. • Screenshot Capture — Export individual viewport or workspace screenshots. • Responsive Issue Scanner — Detect problems such as horizontal overflow, clipped content, and small touch targets. ★ BUILT FOR FRONTEND DEVELOPMENT Test responsive websites across: • localhost • staging environments • internal development environments • production websites ViewGrid is designed for responsive CSS debugging, breakpoint testing, frontend development, design QA, and cross-device layout verification. ★ PRIVACY-FIRST ViewGrid runs locally in your browser with zero telemetry. There are no analytics trackers or ViewGrid cloud servers processing your page content. Website access is required so ViewGrid can render and synchronize the pages you choose inside its responsive testing workspace. ★ OPEN SOURCE ViewGrid is open source and available under the MIT License. Source code, documentation, security information, and issue tracking are available on GitHub. Stop resizing your browser. Test every breakpoint at once with ViewGrid.