Guides
Understand, renew and troubleshoot your SSL certificates, step by step.
7 guides match “certificate authority”.
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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: 2 min
Checking an SSL certificate's expiration date
Four ways to find a certificate's expiration date: browser, online tool, OpenSSL and the file on the server.
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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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Troubleshooting Reading time: 4 min
Troubleshooting the most common SSL errors
Expired certificate, name mismatch, incomplete chain, mixed content: how to identify the cause of the error and fix it.
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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
Adding a domain to monitor
Add a domain in seconds, understand the information displayed and what happens next.
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Tutorials Reading time: 3 min
Importing multiple domains at once (CSV)
Prepare a CSV file, import it and understand the result: duplicates, plan limits and skipped rows.
A certificate to check right now?
The free checker shows its expiry date, issuer and covered domains.