SSL Certificate Checker: Verify Expiration Date & TLS Chain

100% Free Security 🔒 Client-Side Private
SSL Certificate Checker: Verify Expiration Date & TLS Chain
Interactive Client-Side Tool • 100% Free & Fast
Quick Test:
🔒
Inspect SSL / TLS Certificate Status
Enter any domain name to verify HTTPS health, expiry timeline, TLS versions, and certificate chain.

An expired SSL/TLS certificate triggers severe browser security warnings, destroying organic visitor trust. 99tools SSL Certificate Checker tests TLS handshakes, verifies root issuer authorities, and calculates remaining days until renewal.

Quick Guide

How to Use SSL Certificate Checker: Verify Expiration Date & TLS Chain in 3-4 Simple Steps

1

Enter Domain Name

Type any domain to audit its SSL certificate.

2

Scan Certificate

Initiate a secure TLS handshake test.

3

View Expiry & Security Grade

Check remaining days before expiration and certificate chain validity.

Need Help?

Frequently Asked Questions

Everything you need to know about this tool, accuracy, formulas, and privacy.

What happens if an SSL certificate expires?
When an SSL certificate expires, web browsers display a prominent security warning ("Your connection is not private"), driving away organic visitors and negatively impacting SEO trust.

More Free Productivity Tools

Discover complementary online calculators and developer utilities.

View All Tools →