Guides
Understand, renew and troubleshoot your SSL certificates, step by step.
5 guides match “private 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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Tutorials Reading time: 4 min
How to renew your SSL certificate
How to renew a certificate without downtime, whether you use Let's Encrypt, a paid certificate or a host that handles it for you.
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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.
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Tutorials Reading time: 3 min
Creating a free SSL certificate with Let's Encrypt and Certbot
Install Certbot, get a certificate for Nginx or Apache, handle wildcards and make sure automatic renewal really works.
A certificate to check right now?
The free checker shows its expiry date, issuer and covered domains.