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🔐 SSL Certificate Info

Quick Answer

This tool parses an SSL/TLS certificate you paste in PEM format and shows its subject, issuer, serial number, validity window, and whether it's expired or expiring soon — entirely in your browser.

How to get a certificate's PEM text

To check a live website's certificate, use your browser: click the padlock icon → Connection is secure → Certificate → Details → Export, or run openssl s_client -connect example.com:443 -showcerts from a terminal. Paste the resulting PEM block (starting with -----BEGIN CERTIFICATE-----) here.

How to use this tool

  1. Paste a certificate in PEM format into the box.
  2. Click Parse Certificate to see its subject, issuer, validity dates, and expiration status.

Privacy

Parsing happens entirely in your browser using a client-side X.509 library. The certificate text is never sent to any server.

FAQ

Can I check a live domain's certificate without downloading it?

Not with this tool — it only parses a PEM you provide. Use HTTP Header Analyzer or your browser's own certificate viewer to inspect a live site's certificate first, then paste it here for detail.

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