Resource Hints Checker

Paste HTML head markup and check preload, preconnect, dns-prefetch, prefetch and modulepreload hints.

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This checker is for frontend performance QA when resource hints have been added manually or by a CMS/plugin. Paste the head markup and review common mistakes.

What it checks

The report counts preload, preconnect, dns-prefetch, prefetch and modulepreload links. It flags duplicate hints, preload tags missing as, font preloads missing crossorigin and preconnect values that are not absolute origins.

Scope

The tool does not measure performance. It checks markup shape before you confirm real timing with browser tools.