SSL Certificate Decoder
Paste a PEM-encoded certificate to instantly view all its details. Runs entirely in your browser.
What is an SSL Certificate Decoder?
An SSL certificate decoder reads the contents of a PEM-encoded X.509 certificate and displays all its fields in a human-readable format. This includes the subject, issuer, validity dates, public key details, extensions like Subject Alternative Names (SANs), and fingerprints.
This tool runs entirely in your browser. Your certificate data never leaves your machine — no server calls, no data stored.
Common use cases
- Verify the subject and SANs match your domain
- Check certificate expiry dates
- Confirm the issuer and certificate chain
- Inspect key algorithm and size for compliance
- Review extensions like Key Usage and Basic Constraints
Ready to Secure Your Enterprise?
Experience how our cryptographic solutions simplify, centralize, and automate identity management for your entire organization.