What is an SSL certificate?

An SSL/TLS certificate verifies a website’s identity and enables encrypted HTTPS connections between browsers and servers.

How often should I check my SSL certificate?

Check before expiry. Most certificates are valid for 90 days (Let’s Encrypt) or 1-2 years (commercial CAs). Set reminders to renew before they expire.

What does Days Remaining mean?

It shows how many days until the certificate expires. Green means plenty of time, yellow means renew soon, and red means expired or expiring imminently.

SSL Certificate Checker

Check SSL/TLS certificate details for any domain — issuer, expiry date, validity status, and serial number.

Domain name

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How to use SSL Certificate Checker

Enter a domain name (e.g. example.com).
Click Check SSL to query certificate information.
Review the issuer, dates, validity, and days remaining.

What is SSL Certificate Checker?

SSL/TLS certificates encrypt communication between browsers and web servers. This tool queries certificate transparency logs to display certificate details for any domain, including the issuing authority, validity period, and days until expiry.

Monitoring SSL certificate expiry is critical — an expired certificate triggers browser warnings and can drive visitors away.

FAQ

What is an SSL certificate?: An SSL/TLS certificate verifies a website’s identity and enables encrypted HTTPS connections between browsers and servers.
How often should I check my SSL certificate?: Check before expiry. Most certificates are valid for 90 days (Let’s Encrypt) or 1-2 years (commercial CAs). Set reminders to renew before they expire.
What does Days Remaining mean?: It shows how many days until the certificate expires. Green means plenty of time, yellow means renew soon, and red means expired or expiring imminently.

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Author

Prof. Noah Klein"The Privacy Guardian"

Cybersecurity Researcher & Privacy Advocate

Professor Klein holds a PhD in Information Security and has testified before EU parliamentary committees on data privacy legislation. He builds encryption tools for journalists, audits web applications for security flaws, and believes that privacy is not a feature but a fundamental right. His research has been cited in Wired, Nature, and The Guardian, and he advises nonprofits on responsible data stewardship.

📖 SSL Certificate Checker on Wikipedia·Network & Domain Tools on Wikipedia·SSL Certificate Checker on Britannica

Last updated: 2026-05-24

SSL Certificate Checker

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