Free SSL Lookup Tool — Check SSL Certificate Details, Expiry & Security Status
What Is an SSL Lookup?
An SSL lookup retrieves and displays the complete details of a website's SSL/TLS certificate — the digital certificate that enables HTTPS encryption between a browser and a web server. Our free SSL lookup tool lets you instantly verify any website's certificate, including its issuer, validity dates, encryption strength, and chain of trust.
SSL certificates are the foundation of web security. They encrypt data in transit, authenticate website identity, and are a confirmed Google ranking factor. Checking your SSL status regularly ensures your site stays secure and trusted.
Why SSL Certificates Matter for SEO & Security
Since 2014, Google has used HTTPS as a ranking signal. An invalid, expired, or missing SSL certificate can hurt your site in multiple ways:
- Search rankings — Google prefers HTTPS sites; HTTP-only sites rank lower
- Browser warnings — Expired certificates trigger "Not Secure" warnings that drive visitors away
- Trust & conversions — Users look for the padlock icon before entering personal data or making purchases
- Data protection — SSL encrypts sensitive information like passwords, credit cards, and form submissions
- Compliance — PCI DSS, HIPAA, and GDPR all require encrypted data transmission
What SSL Details Can You Check?
Certificate Issuer
See which Certificate Authority (CA) issued the SSL certificate — such as Let's Encrypt, DigiCert, Comodo, or Sectigo. The issuer's reputation affects trust levels.
Validity Period
Check the issue date and expiration date. SSL certificates typically last 90 days (Let's Encrypt) to 1 year. Letting a certificate expire breaks HTTPS and triggers browser warnings.
Encryption Details
View the encryption algorithm, key size, and TLS version. Modern certificates should use at least TLS 1.2 with 2048-bit RSA or 256-bit ECC keys.
Subject & SANs
Check which domain names are covered by the certificate, including Subject Alternative Names (SANs). Wildcard certificates cover all subdomains under a domain.
Certificate Chain
Verify the full chain of trust from the server certificate through intermediate certificates to the root CA. A broken chain causes validation errors.
How to Use Our SSL Lookup Tool
- Enter the domain name you want to check (e.g., example.com)
- Click the lookup button
- Review the complete SSL certificate details
- Check for expiration dates, weak encryption, or chain issues
Common Use Cases
- Pre-launch checks — Verify SSL is properly installed before launching a website
- Expiration monitoring — Catch expiring certificates before they break your site
- Security audits — Ensure certificates meet current encryption standards
- Competitor analysis — See what SSL solution competitors use
- Troubleshooting — Diagnose HTTPS errors and mixed content warnings
SSL Best Practices
- Set up auto-renewal for SSL certificates to prevent unexpected expirations
- Use TLS 1.2 or 1.3 — disable older, insecure versions (TLS 1.0, 1.1, SSL 3.0)
- Redirect all HTTP traffic to HTTPS with a 301 redirect
- Enable HSTS (HTTP Strict Transport Security) to force HTTPS connections
- Monitor certificate transparency logs for unauthorized certificates issued for your domain
Related SEO Tools
Pair SSL checks with these tools for comprehensive site analysis:
- DNS Lookup — Verify DNS records and domain configuration
- Whois Lookup — Check domain ownership and registration details
- Safe URL Checker — Verify if a URL is flagged as unsafe by Google
- HTTP Headers Lookup — Inspect server response headers including security headers
- HTTP/2 Checker — Test if your server supports modern HTTP/2 protocol
Frequently Asked Questions
How often should I check my SSL certificate?
Check your SSL certificate at least monthly, and set up automated monitoring to alert you 30 days before expiration. If you use Let's Encrypt (90-day certificates), automated renewal and regular checks are essential.
What happens when an SSL certificate expires?
Browsers display a full-page "Your connection is not private" warning that blocks most visitors from accessing your site. This immediately kills traffic, trust, and conversions — and can hurt your search rankings.
Is a free SSL certificate as good as a paid one?
For encryption, yes. Free certificates from Let's Encrypt provide the same encryption strength as paid certificates. Paid certificates may offer extended validation (EV), warranty, and customer support — but the encryption itself is identical.
What does "certificate chain incomplete" mean?
It means the server isn't sending the intermediate certificates needed to verify the chain of trust from your certificate to a trusted root CA. This causes errors in some browsers. Fix it by installing the complete certificate chain on your server.
Share
Similar tools
Take an IP and try to look for the domain/host associated with it.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get approximate IP details.
Get all possible details about a domain name.
Popular tools
Check for 301 & 302 redirects of a specific URL. It will check for up to 10 redirects.
Get & verify the meta tags of any website.
Make sure your passwords are good enough.
Check if the URL is banned and marked as safe/unsafe by Google.
Check if the URL is cached or not by Google.
Get the web-host of a given website.