ScreenLab

Stop wondering if your site looks right. Know it does. Stop resizing your browser window over and over. ScreenLab lets you view any webpage across multiple device sizes simultaneously — no more guesswork, no more missed breakpoints. 🎯 One Click. Every Screen. Toggle ScreenLab and instantly see your site rendered across phones, tablets, and desktops side by side. Test responsive layouts in real-time without leaving your browser. 📱 Pixel-Perfect Device Presets iPhone, iPad, Android, MacBook, 4K monitors — all the devices your users actually use. Pre-configured viewport sizes so you can test what matters. ✨ Custom Viewports, Your Way Need a specific screen size? Create unlimited custom viewports. Save them for quick access across all your projects. 🔒 Lock Height Mode Keep all screens contained within your viewport, or unlock to see full-page scrolling behavior. You control the view. 🔄 Synchronized Scrolling Scroll once, scroll everywhere. All viewports stay perfectly in sync so you can compare sections across every breakpoint instantly. 📸 One-Click Screenshot Export Capture all viewports at once and download as a ZIP. Perfect for design reviews, client presentations, or QA documentation. 🌙 Dark Mode Built In Easy on the eyes during late-night debugging sessions. Toggle between light and dark themes instantly. ⚡ Works Everywhere Chrome, Firefox, Safari — ScreenLab runs on all major browsers. Test any website, any URL, any time. 💎 Free to Start. Pro When You're Ready. Test up to 3 screens free. Upgrade to Pro for unlimited viewports, custom presets, and screenshot exports.