SSL Checker
Enter a domain to check whether its SSL certificate is valid and when it expires.
How to Use SSL Checker
- 1
Enter a domain name.
- 2
Click Check to connect and retrieve its SSL certificate.
- 3
Review the validity, issuer and expiry date.
SSL Checker Features
- Shows certificate validity, issuer, subject, expiry date and days remaining.
- Displays the negotiated TLS protocol version and serial number.
- Connects directly to the domain's server on port 443 in real time.
Why use Tool King?
Fast
No waiting rooms or sign-ups. Most files are ready in seconds.
Private
Files are processed in memory and discarded right after — never stored or shared.
Free
Every tool is free to use, with no hidden limits on the essentials.
Frequently Asked Questions
Related guides
What is SSL? Understanding the padlock in your browser
Why that little padlock icon matters, and what it actually verifies — explained in plain English, with no security jargon required.
Read guideWhat is DNS? A plain-English explanation
How your browser turns a domain name like example.com into the server it actually talks to — explained in plain English.
Read guideHow HTTPS actually works, step by step
The handshake that happens before a single byte of a webpage is loaded — explained step by step, in plain, jargon-free English.
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