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Everything runs right here in your browser. What you paste never leaves this page — only DNS lookups go to Google Public DNS, Whois asks the domain or IP registry, My IP asks ipwho.is, and the calculator fetches exchange rates.

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Certificate decoder

Paste a PEM certificate (or a whole chain) or drop a .pem / .crt / .cer file: subject, issuer, validity, SANs, key, fingerprints. Get one with openssl s_client -connect example.com:443 -showcerts.

PEM

Open a file