Free SSL Ceritificate Checker
Check any website’s SSL certificate status, expiry date, issuer, domain match, certificate chain, HTTPS setup, and basic TLS security with DarkScout’s free SSL checker.
You do not need to include https://. DarkScout checks public SSL/TLS information only.
What Is an SSL Certificate Checker?
An SSL certificate checker is a tool that checks whether a website has a valid SSL/TLS certificate. It can show whether HTTPS is enabled, who issued the certificate, when it expires, whether the certificate matches the domain, and whether the certificate chain is trusted.
What Does DarkScout's SSL Certificate Checker Show?
Get a complete overview of your SSL certificate health, HTTPS deployment, and browser trust with a single scan.
SSL certificate status
See whether the certificate is valid, expired, expiring soon, missing, or misconfigured.
Expiry date
Check when the certificate expires and how many days are left before renewal is needed.
Certificate issuer
View the certificate authority and issuer information associated with the certificate.
Domain match
Confirm whether the certificate matches the domain or subdomain being checked.
Certificate Chain
Check whether the certificate chain is complete and trusted by browsers.
HTTPS setup
Review whether HTTPS is enabled and whether HTTP traffic redirects correctly to HTTPS.
Basic TLS signals
Identify basic TLS and HTTPS configuration issues that may affect website security.
Why SSL Certificate Checks Matter
SSL certificates are one of the first trust signals browsers and visitors look for. A single expired or misconfigured certificate can cause browser warnings, interrupted logins, failed API requests, payment issues, and loss of customer confidence.
Connection is secure
Certificate verified by CA
Common SSL Certificate Problems
The most frequent SSL issues found during a website scan, what they mean, and why each one matters.
| SSL issue | What it means | Why it matters |
|---|---|---|
| Expired certificate | The certificate is no longer valid | Browsers may show security warnings |
| Expiring soon | Renewal is needed soon | Avoid downtime and trust issues |
| Hostname mismatch | Certificate does not match the domain | Users may see certificate errors |
| Missing intermediate certificate | Chain is incomplete | Some browsers or clients may not trust it |
| Untrusted certificate authority | Certificate was not issued by a trusted CA | Browser warnings may appear |
| HTTP not redirecting to HTTPS | Insecure version is still accessible | Users may connect over HTTP |
| Weak TLS configuration | Old protocols or weak settings may be supported | Can reduce security posture |
| Mixed content | HTTPS page loads insecure HTTP resources | Browser warnings or blocked assets may occur |
SSL Certificate Checker vs Website Security Scanner
SSL Certificate Checker
Best for checking certificate health
- SSL status & expiry
- Issuer & domain match
- Certificate chain
- HTTPS setup
Website Security Scanner
Best for a broader security review
- SSL/TLS configuration
- Security headers & cookies
- DNS exposure
- Mixed content & misconfigs
Need a broader scan? Use DarkScout's Website Security Scanner to check SSL/TLS, security headers, cookies, DNS exposure, mixed content, and common website misconfigurations.
Scan Website FreeWhat Should You Do If Your SSL Certificate Is Expired?
- 01Renew or reissue the SSL certificate.
- 02Install the updated certificate on your server, CDN, or hosting provider.
- 03Confirm the certificate matches the correct domain or subdomain.
- 04Check that intermediate certificates are installed correctly.
- 05Force HTTP to HTTPS redirects.
- 06Re-scan the website after deployment.
- 07Set up renewal reminders or automated certificate renewal.
Check SSL Certificates on Subdomains
SSL issues often happen on subdomains, not only the main website. A company may secure example.com but forget certificates for app, staging, API, customer portal, or regional subdomains.
For broader visibility, combine SSL checks with DarkScout's Attack Surface Mapper to discover exposed domains, subdomains, and public-facing assets.
Attack Surface MapperWho Should Use an SSL Certificate Checker?
Website owners
Check whether your website's SSL certificate is valid and trusted.
Developers
Verify SSL after deployments, migrations, DNS changes, CDN changes, or certificate renewals.
Agencies
Review client websites for expired, misconfigured, or mismatched SSL certificates.
SaaS teams
Check marketing sites, app domains, API endpoints, login pages, and customer portals.
E-commerce teams
Avoid browser warnings and checkout disruption caused by expired or invalid certificates.
Security teams
Review SSL issues as part of external exposure and attack surface monitoring.
From SSL Certificate Checks to External Exposure Monitoring
An SSL certificate check gives you a snapshot of one website's HTTPS configuration. Businesses also need to monitor exposed domains, subdomains, open ports, risky assets, leaked credentials, email security risks, IP reputation, and dark web exposure. DarkScout helps connect these signals into continuous external exposure monitoring so teams can understand what is exposed, why it matters, and what to fix next.
More Free Security Tools from DarkScout
Website Security Scanner
Run 120+ website security checks including SSL/TLS, headers, cookies, DNS, and mixed content in under 30 seconds.
Email Breach Checker
Find out if your business or personal email has been exposed in a dark web breach.
Password Generator
Generate strong, uncrackable passwords to protect your business accounts.
IP Reputation Checker
Instantly check your own IP address for blacklist status, VPN/proxy detection, geolocation, abuse reports, and overall risk score.
Common questions about the SSL Certificate Checker.
Quick answers about how DarkScout scans your SSL Certificate, what the grades mean, and how to improve your security score.
