Question 1

Is my certificate data private?

Accepted Answer

Yes. The certificate is parsed entirely in your browser using JavaScript. No data is sent to any server.

Question 2

What format does the certificate need to be in?

Accepted Answer

The tool accepts PEM format, which starts with -----BEGIN CERTIFICATE-----. This is the most common format used by web servers and certificate authorities.

Question 3

What is a Subject Alternative Name (SAN)?

Accepted Answer

SANs are additional hostnames or IP addresses the certificate is valid for. Modern certificates use SANs instead of (or in addition to) the Common Name for multi-domain certificates.

Question 4

What is the fingerprint used for?

Accepted Answer

Fingerprints (SHA-1 and SHA-256 hashes of the certificate) are used to verify and identify a specific certificate uniquely. They are useful for pinning and auditing.

Question 5

Why does it show as expired?

Accepted Answer

The sample certificate is an older root CA certificate used for demonstration. Real certificates from your server should show valid dates.

SSL Certificate Decoder

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