Instantly verify your SSL certificate. Check expiration, chain validity, and security configuration—no signup required.
Free Tool · Instant results · No signup required
Type your domain name without the https:// prefix.
Our server initiates a TLS handshake and retrieves your certificate.
We verify validity, check the chain, and analyze security configuration.
See exactly what's working and what needs attention.
Is the certificate currently valid, expired, or not yet valid?
When does the certificate expire? How many days remaining?
Is the complete chain present? Root, intermediate, and leaf certificates.
Which domains are covered by this certificate (SANs)?
Who issued the certificate? Is it a trusted Certificate Authority?
Which TLS versions and cipher suites are supported?
Want to understand more about SSL monitoring? Read our SSL Certificate Monitoring Guide.
The most common issue. Certificates have a maximum lifespan (usually 90 days for Let's Encrypt, up to 1 year for others). Once expired, browsers show scary security warnings.
Solution: Set up automatic renewal and monitoring alerts.
Your server isn't sending the intermediate certificate. Some browsers can work around this; others (especially mobile) can't.
Solution: Configure your server to send the full chain.
The certificate doesn't cover the domain you're accessing. Common when forgetting to include www or adding new subdomains.
Solution: Get a certificate that includes all your domains (SANs).
The certificate isn't signed by a trusted Certificate Authority. Browsers will reject it with a security warning.
Solution: Use a certificate from a trusted CA like Let's Encrypt (free).
Verify SSL is correctly configured before going live
Confirm the new certificate is properly installed
Find out why users are seeing security errors
Verify their SSL before integrating
Ensure SSL certificates were correctly moved
Quick check that everything is still working
| Feature | This Free Tool | PerkyDash SSL Monitoring |
|---|---|---|
| Check certificate validity | ||
| Show expiration date | ||
| Verify certificate chain | ||
| Automatic daily checks | ||
| Expiration alerts (30/14/7/3 days) | ||
| Email/Slack/Discord notifications | ||
| Multiple domains dashboard | ||
| Historical tracking | ||
| Combined with uptime monitoring |
This tool is perfect for one-time checks. For ongoing peace of mind, PerkyDash SSL Monitoring ensures you never miss an expiration.
Yes, completely free. You can check unlimited domains without signing up or paying anything. For continuous monitoring with automatic alerts, you can upgrade to PerkyDash.
SSL certificates form a chain of trust: your certificate → intermediate certificate → root certificate. If your server doesn't send the intermediate certificate, some browsers can't verify the chain and will show an error. Fix this by configuring your server to send the complete chain.
For manual checks, at least once a month or after any server changes. For production sites, automated daily monitoring is recommended—it catches problems immediately and sends alerts before certificates expire.
Common causes: your browser has cached an old certificate (clear cache and retry), the domain you're visiting doesn't match the certificate's SANs, or there's a mixed content issue (HTTP resources on an HTTPS page). Check the SANs list in our results to verify domain coverage.
SSL (Secure Sockets Layer) is the older protocol; TLS (Transport Layer Security) is the modern, more secure replacement. When people say "SSL certificate," they usually mean a certificate used with TLS. All modern browsers use TLS 1.2 or 1.3.
This tool can only check publicly accessible domains. For internal domains or servers behind a firewall, you'll need to use command-line tools like OpenSSL or install monitoring software inside your network.
This tool shows you the current status. PerkyDash monitors continuously and alerts you before problems happen.
Free tier includes SSL monitoring for all your domains. No credit card required.