Free SSL Certificate Checker
Enter any domain to check its SSL/TLS certificate. View the issuer, validity dates, expiration countdown, and full certificate chain.
Why Check SSL Certificates?
SSL certificates are essential for securing your website and building trust with visitors. An expired or misconfigured certificate can lead to browser warnings that drive users away and hurt your search engine rankings.
Understanding the Certificate Chain
Every SSL certificate is part of a chain of trust. Your domain's certificate (the leaf) is signed by an intermediate Certificate Authority (CA), which is in turn signed by a root CA that browsers trust. If any link in this chain is missing or invalid, the certificate won't be trusted.
SSL Certificates and Custom Domains
When SaaS platforms offer custom domains, each customer domain needs its own SSL certificate. Managing hundreds or thousands of certificates manually is impractical. Automated solutions like Let's Encrypt combined with the ACME protocol make this feasible, but the integration work is non-trivial. You can verify your DNS records and HTTP headers to check that SSL is properly configured.
SaaSKevin handles the entire SSL lifecycle for your SaaS platform's custom domains -- provisioning, validation, installation, and renewal -- automatically with zero configuration from your users.
Frequently Asked Questions
- What is an SSL certificate?
- An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates a website's identity and enables an encrypted connection (HTTPS). It ensures data transmitted between the user's browser and the server remains private and secure.
- How do I know if my SSL certificate is valid?
- Use this SSL checker tool to verify your certificate. A valid certificate will show a green status with days remaining before expiration. Your browser also shows a padlock icon for sites with valid SSL certificates.
- What happens when an SSL certificate expires?
- When an SSL certificate expires, browsers will show a security warning to visitors, potentially blocking access to your site. This can damage user trust and hurt SEO rankings. It's important to renew certificates before they expire.
- How do SaaS platforms manage SSL for custom domains?
- SaaS platforms that support custom domains need to provision individual SSL certificates for each customer's domain. This can be done manually, through automated tools like Let's Encrypt with ACME protocol, or by using services like SaaSKevin that handle SSL provisioning and renewal automatically.
- What is the certificate chain?
- The certificate chain (or chain of trust) is the sequence of certificates from your domain's certificate up to a trusted root Certificate Authority (CA). It typically includes the leaf certificate (your domain), one or more intermediate certificates, and a root certificate.
Need setup examples for real SaaS products? Browse our industry guides and explore all free domain tools.