Test responsive designs in 10 seconds. Instantly change viewport width from 390px to 3840px and verify PC, mobile, and tablet displays. Dramatically reduce your web testing time. ■ Key Features • Change viewport width instantly without page reload • Simulate browser detection with 74 User-Agent strings • Switch between iPhone, iPad, and desktop resolutions with one tap • Save up to 10 custom presets for frequently used settings • Share test results immediately with screenshot feature ■ Perfect For Web designers spending too much time on responsive checks, frontend engineers streamlining cross-browser testing, QA testers needing multi-device verification, general users wanting desktop sites on mobile, and all web development professionals. ■ How It Works 1. Enter URL to display site 2. Select PC/Mobile/Custom mode 3. Adjust viewport width with slider 4. Change User-Agent as needed ■ Privacy & Security Your privacy is our top priority. We never transmit your browsing data or personal information externally. All settings are securely stored on your device only. A professional tool that dramatically improves web testing efficiency.
