SSL Certificate Checker

An SSL (Secure Sockets Layer) certificate encrypts data transmitted between a user's browser and a website. It enables HTTPS (the padlock icon) and protects sensitive information like passwords and credit card numbers from interception. Modern certificates use TLS (Transport Layer Security), the successor to SSL.

Google confirmed HTTPS as a ranking signal in 2014. Sites without HTTPS show a 'Not Secure' warning in Chrome, which increases bounce rates. HTTPS also enables HTTP/2 for faster page loads and is required for many modern browser APIs.

Security headers are HTTP response headers that add extra protection: HSTS forces HTTPS, CSP controls which resources load, X-Frame-Options prevents clickjacking, X-Content-Type-Options prevents MIME sniffing, and Referrer-Policy controls referrer information shared with other sites.

Using the SSL Certificate Checker is simple: visit the tool page, enter your data or input into the provided fields, and get instant results. Follow the controls on the page. Some functions require sign-in or a paid plan; see Pricing for limits.

The Free plan includes 10 tool uses per day. Some features require an account or a paid plan. Check the controls on the tool page and Pricing for the applicable limits.

The SSL Certificate Checker returns results based on the inputs and the tool methodology. Check assumptions, units and source dates. Treat projections as estimates. For critical decisions, always consult a qualified professional.

Local calculations run in your browser. AI features, accounts, saved reports and external data requests use server services. Check the tool description and privacy policy for the relevant processing and storage.