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# Static asset checker

Fetch one page's HTML plus its linked stylesheets through the capped proxy and report static delivery heuristics: render-blocking scripts and styles, missing image dimensions, lazy-load gaps, format upgrades, duplicate assets, missing cache busting, preload, preconnect, and font-display.

Enter a page URL to check its static delivery.

Every finding here is a heuristic over one page's HTML, read from tags, never from a rendered page: scripts injected by JavaScript, assets behind a client-side router, and the viewport fold are all invisible. The proxy hands back at most the first 4,096 characters of each response body, so a larger page is checked on that prefix and the report says so. Findings stop at 10 items each; the true count sits beside the list. A clean report means nothing flagged in what was scanned, not a fast page.
Options

## More web & auth tools

- [HTTP header parser](/web/headers)
- [Certificate & CSR](/web/certificate)
[All web & auth tools](/web)

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Canonical HTML: https://nutter.tools/web/static-asset-checker
Markdown version: https://nutter.tools/web/static-asset-checker.md
Plain-text version: https://nutter.tools/web/static-asset-checker.txt
Agent index: https://nutter.tools/llms.txt