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Resource Hints Checker
Free resource hints checker — validate preload, prefetch, preconnect, and dns-prefetch tags. Optimize how your browser prioritizes resource loading.
Frequently Asked Questions
What is the difference between preload and prefetch?
Preload downloads resources needed for the current page with high priority (fonts, critical CSS). Prefetch downloads resources for future navigation with low priority (next page assets).
When should I use preconnect?
Use preconnect for third-party domains you'll request resources from (CDNs, analytics, fonts). It establishes the connection early, saving DNS lookup, TCP, and TLS handshake time.
Can too many resource hints hurt performance?
Yes. Too many preloads compete for bandwidth and can delay critical resources. Limit preloads to 2-3 critical assets. Excessive dns-prefetch or preconnect hints also add overhead.
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