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Resource Hint Conflict Checker

Delivery hints

Resource Hint Conflict Checker

Paste the document head. The checker finds duplicate hints, unused preloads, wrong as types, missing font CORS, and overcrowded preconnects that can slow first paint.

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Document head

Paste the head HTML, or include body tags if preloaded files are referenced there.

Hints are audited in this browser. HTML is not uploaded.

Conflict checks

Keep a short list of critical preloads. Drop unused hints and do not preconnect every third-party host.

Paste head HTML or load the example.

Parsed hints

Each preload, modulepreload, preconnect, dns-prefetch, or prefetch tag is listed with any conflicts.

No resource hints found yet.

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Only query what is needed

Network diagnostics use the domain, URL, or IP you enter to run the requested check and show actionable results.

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Quick workflow

Enter a domain, URL, IP address, or DNS value.
Run the check and review warnings or records.
Use the suggested follow-up tools to verify related settings.

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Useful tip

For DNS changes, check records first, then propagation, and finally related email or SSL settings.

Suggested next steps

Continue with tools that often pair well with this task.

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Next step

Preload Preconnect Hint Generator

Paste fonts, CDN origins, and critical images to generate preload, preconnect, and dns-prefetch tags locally.

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Next step

HTML Head Preflight Auditor

Paste HTML and audit title, meta description, canonical, robots, OG, Twitter Card, JSON-LD, favicon, lang, and viewport before launch

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Next step

Font Loading CSS Advisor

Paste font CSS or HTML and get local advice for preload, font-display, WOFF2, and subsetting before launch.

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Next step

Above The Fold Asset Checklist

Inventory first-view CSS, fonts, images, and scripts, then score render-blocking and LCP risks locally before publish.

Luck predicts what you like

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