Server-side Rendering (SSR) Checker

About Server-side Rendering (SSR) Checker

The SSR Checker is a web-based tool for verifying whether a webpage is server-side rendered. It loads a given URL twice — once with JavaScript disabled to capture the server-rendered HTML, and once with JavaScript enabled to capture the fully hydrated version — then displays both side by side so users can visually and textually compare the UI and HTML output to identify content that is client-rendered rather than server-rendered.

The tool can simulate multiple user agents, including Googlebot (smartphone and desktop) and Chrome on Android, iPhone, and Windows, and it follows redirects as a real browser would, using a headless Chromium browser under the hood. It is designed for testing JavaScript-heavy sites and frameworks such as React, Next.js, Vue/Nuxt, and Angular, helping identify which parts of a page are rendered on the server versus after hydration.

It is intended for frontend developers checking SSR issues during development, SEO professionals and website owners verifying that server-rendered content isn't affecting search indexing or page speed, and product marketers confirming that SSR issues aren't undermining marketing pages. It is available only as a web application, with the ability to share results via links and retain past test results to track regressions over time.

Key features

• Side-by-side visual comparison of server-rendered vs regular-rendered UI
• Simulates multiple user agents including Googlebot Desktop/Smartphone and Chrome on Android/iPhone/Windows
• Highlights HTML and UI differences between SSR and CSR versions
• Follows redirects like a real browser
• Uses headless Chromium under the hood
• Shareable results with saved history to track regressions over time

Frequently asked questions