Guides
Understand, renew and troubleshoot your SSL certificates, step by step.
3 guides match “public key”.
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Fundamentals Reading time: 4 min
Understanding SSL/TLS certificates
What an SSL certificate really is, what it contains, who issues it, and why it always ends up expiring.
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Security Reading time: 4 min
SSL/TLS security best practices
Protocols, keys, HSTS headers, redirects and certificate monitoring: the checklist for a solid HTTPS setup.
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Fundamentals Reading time: 3 min
SSL certificates: validity is dropping to 47 days
200 days in 2026, 100 days in 2027, 47 days in 2029. The timeline, what changes for Let's Encrypt and paid certificates, and how to prepare.
A certificate to check right now?
The free checker shows its expiry date, issuer and covered domains.