SSL Certificate Checker
Verify SSL/TLS certificate details for any domain
Features
Certificate Details
Issuer, validity period, and SANs
Expiration Tracking
Days remaining until expiration
SSL Certificate Checker Tool
Our free online SSL Certificate Checker allows you to verify the SSL/TLS certificate details for any website. Check certificate validity, expiration dates, issuer information, and more to ensure your website's security is up to date.
What is an SSL Certificate?
SSL (Secure Sockets Layer) certificates are digital certificates that authenticate a website's identity and enable an encrypted connection. They are essential for:
- Securing data between the user's browser and the website
- Establishing trust with visitors
- Improving search engine rankings (Google favors HTTPS sites)
- Meeting compliance requirements for data protection
Why Check SSL Certificates?
Regular SSL certificate checks help you:
- Prevent security warnings for your visitors
- Avoid website downtime due to expired certificates
- Identify potential security vulnerabilities
- Ensure compliance with security standards
- Monitor certificate validity across multiple domains
Key SSL Certificate Details
Our tool provides comprehensive information about each SSL certificate:
- Validity Status - Is the certificate currently valid?
- Issuer - Which Certificate Authority issued the certificate
- Expiration Date - When the certificate will expire
- Subject Alternative Names (SANs) - Additional domains covered
- Certificate Chain - Complete trust chain verification
- Encryption Strength - Key size and algorithm used
How to Use This SSL Checker
- Enter the domain name you want to check (without http:// or https://)
- Click "Check SSL" or press Enter
- Review the detailed certificate information
- Check the expiration status and validity period
- Verify the certificate chain and encryption details
Understanding Certificate Status
- Valid - Certificate is properly installed and not expired
- Expiring Soon - Certificate will expire within 30 days
- Invalid - Certificate has expired or has configuration errors
Frequently Asked Questions
Q: How often should I check my SSL certificate?
A: We recommend checking at least monthly, and setting up reminders for certificates expiring within 30 days.
Q: What's the difference between SSL and TLS?
A: TLS is the successor to SSL, but the term SSL is still commonly used to refer to both protocols.
Q: Why does my website need an SSL certificate?
A: SSL certificates encrypt data, authenticate your website, and are required for HTTPS connections.
Q: How long do SSL certificates last?
A: As of 2025, SSL certificates have a maximum validity of 13 months (398 days).
Q: Is this tool safe to use?
A: Yes, we don't store any of the domains you check, and all checks are performed in real-time.