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Render-Blocking Resource Analyzer — Free Online Tool

Find scripts + CSS blocking first paint

Paste HTML head → find render-blocking scripts and stylesheets. Recommend async/defer/preload.

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Learn more

Render-blocking analyzer

How to use this tool

  1. 1

    Paste HTML head

  2. 2

    See blocking resources

Frequently Asked Questions

Render-blocking?
Scripts without async/defer and CSS without media attr block the critical rendering path. Directly hurts LCP.

Key Takeaways

  • Render-Blocking Resource Analyzer is a free, browser-based seo & web tool — find scripts + css blocking first paint.
  • No signup, no downloads, no file uploads. Tools run in your browser; the few that need an outside service say so on the page.
  • Works on desktop, tablet, and mobile. Install as a PWA for offline access.

How to Use Render-Blocking Resource Analyzer

  1. Open the tool: Launch Render-Blocking Resource Analyzer on Toololis — no account or download needed.
  2. Enter your data: Paste text, enter values, or select a file directly in your browser.
  3. Get instant results: Everything is processed locally — results appear immediately.
  4. Copy or download: Save your output or share it. Bookmark for quick access next time.

Render-Blocking Resource Analyzer — Quick Facts

Price
Free — no limits, no watermarks, no paywalls
Privacy
Processed in your browser. Tools that need an outside service say so on the page. Page views are counted (Google Analytics).
Platform
Any modern browser on desktop, tablet, or mobile
Category
SEO & Web Tools on Toololis
Offline
Works offline after first visit (Progressive Web App)
FeatureDetails
ToolRender-Blocking Resource Analyzer
CategorySEO & Web
Signup RequiredNo
File UploadNone — processed in browser
Mobile SupportFully responsive
CostFree forever

Why Use Render-Blocking Resource Analyzer?

You should try Render-Blocking Resource Analyzer for a quick, private way to find scripts + css blocking first paint. Processing happens in your browser and files are never uploaded; the few tools that need an outside service say so on the page.

On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.