Inspect PEM or DER certificates, CSRs, public keys, and private-key structure locally. Review extensions, expiry, host names, CSR signatures, chains, and key matches.
Checks DNS SAN names, with CN fallback only when SAN is absent. Wildcards match one label.
Up to 30 objects and 20 MB total. Password-protected PFX/P12 is not supported.
Decode public-key objects and catch common deployment mistakes locally. Inspect PEM or DER certificates, CSRs, public keys, and private-key structure locally. Review extensions, expiry, host names, CSR signatures, chains, and key matches. The core workflow is designed to run in your current browser.
Yes. X.509 Certificate, CSR & Key Inspector opens in a modern browser and does not require desktop software installation.
Common use cases include Review a TLS certificate bundle before deployment; Verify a CSR signature and requested public key.
The core processing workflow is designed to run locally in the browser. Key capabilities include Parse certificate, PKCS#10 CSR, SPKI, PKCS#8, PKCS#1, and SEC1 structures, Show SAN, key usage, constraints, identifiers, policies, AIA, and CRL indicators, Flag validity windows, weak signatures, small RSA keys, and hostname mismatch; account, comments, and anonymous analytics may still create normal site requests.
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