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# Website technology checker

Fingerprint a site's stack from pasted response headers and HTML source against a fixed signature list for CMS, frameworks, analytics, and CDN markers.
Response headersPage source

Paste headers, page source, or both and the scan runs as you type.

This checks a fixed signature list, not a live database: about fifty well-known markers across servers, CDNs, CMSs, commerce platforms, builders, generators, frameworks, libraries, CSS conventions, and analytics. Sites hide markers, reverse proxies strip headers, and one signature can be shared by two products, so treat every row as a strong hint rather than a verdict. Nothing is fetched and nothing is scanned beyond what you paste.
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## More web & auth tools

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

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