FM 4-04 Chapter 4 · Security and crypto
Certificate decoder
Decode X.509 certificates, chains and CSRs: names, validity, key, extensions, fingerprints.
Local only Runs in your browser. Nothing you enter leaves this page.
Everything is decoded in this page. OCSP, CRL and CA issuer URLs are shown as text and never fetched. The chain check compares names and key identifiers in the order pasted; it does not verify signatures or trust.