Free Online Render Blocking Resource Checker
Use this browser-based performance audit tool to review pasted page source before launch or optimization. Your input stays in your browser, and the copyable report gives you practical cleanup priorities.
Render Blocking Resource Checker
Scan pasted HTML for render-blocking CSS, synchronous scripts, preload hints, async/defer usage, and page-speed cleanup opportunities.
Upload page source or paste manually. Files are processed in your browser.
Paste page source, then run the audit.