Testing responsive designs traditionally means resizing the browser window or using DevTools' device toolbar to switch between viewport sizes one at a time. This works, but you can only see one size at a time — making it impossible to compare how a section looks on mobile vs desktop simultaneously. Responsive Viewer solves this by rendering the page in multiple viewports at once, displayed side by side on your screen. Select from preset device profiles (iPhone 15, iPad Pro, Pixel 8, MacBook, 1440p Desktop) or enter custom dimensions. Each viewport is a fully rendered instance of the page, not a static screenshot — scroll one and all others scroll to the same position. This synchronized scrolling lets you compare the exact same content area across all device sizes at a glance. It's the fastest way to spot responsive issues: navigation that wraps incorrectly, images that overflow their containers, text that becomes unreadable on small screens, or spacing that collapses awkwardly.
在不同设备尺寸下实时查看网站如何响应和适配。
选择预定义的设备（iPhone、iPad、台式电脑等）来模拟真实用户的浏览体验。
输入自定义宽度和高度值以测试特定的屏幕分辨率。
快速在纵向和横向模式之间切换以测试不同的布局。
模拟不同设备的像素密度以测试视网膜和高DPI显示。
在CSS媒体查询断点处测试布局以确保平滑的响应式设计。
在开发时验证网站是否针对手机设备进行了优化。
确保平板电脑用户获得最佳的浏览体验。
检查网站在大屏幕上的展现效果。
在开发期间测试所有CSS媒体查询断点。
在向客户展示之前执行最终的响应式设计检查。
导航到要检查响应式设计的网站。
启动响应式设计模式查看工具。
从预设中选择或输入自定义宽度和高度。
验证网站在选定的视口尺寸下看起来正确。
检查各种屏幕大小以确保完整的响应式覆盖。
