SSL Certificate & HTTPS Checker
Inspect HTTPS encryption, automatic HTTP-to-HTTPS redirection, HSTS headers, and TLS connection security.
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SSL Certificate & HTTPS Connection Checker
A secure HTTPS connection protects visitor data, builds trust, and satisfies modern browser and search engine security baselines. This tool performs live server-side verification of HTTPS connectivity, HTTP-to-HTTPS redirect enforcement, and HTTP Strict Transport Security (HSTS) headers.
What this tool helps with
The SSL Certificate & HTTPS Checker helps with testing whether a website properly secures traffic with HTTPS, enforces automatic redirection from insecure HTTP, and configures HSTS headers to prevent man-in-the-middle attacks and protocol downgrade vulnerabilities.
How to use the result
- Enter the domain or public webpage URL to inspect.
- Check whether the HTTPS connection establishes securely and returns a successful HTTP status.
- Verify that HTTP requests on port 80 automatically redirect to HTTPS.
- Review your HSTS header configuration, including max-age, includeSubDomains, and preload eligibility.
Best practices for stronger results
- Always enforce an automatic 301 or 308 redirect from HTTP to HTTPS across all domain variants.
- Deploy HSTS headers with a long max-age (at least 31536000 seconds / 1 year) once HTTPS stability is proven.
- Avoid mixed content where images, scripts, or stylesheets load over insecure HTTP.
- Keep SSL certificates configured with automated renewal via Let's Encrypt, Cloudflare, or your web host.
Important: It does not perform intrusion testing, vulnerability exploitation, or a complete security certification.
Why HTTPS is an essential foundation for websites
HTTPS encrypts the communication channel between a visitor's browser and your web server, protecting sensitive information like login credentials, credit card details, and personal enquiry forms from eavesdropping or tampering.
Modern web browsers explicitly mark non-HTTPS websites as "Not Secure", which damages visitor credibility and increases bounce rates. Furthermore, HTTPS is a confirmed ranking signal in Google's search algorithms.
HSTS: Preventing SSL stripping and protocol downgrades
HTTP Strict Transport Security (HSTS) is a response header that instructs browsers to communicate with the host exclusively over HTTPS for a specified duration, even if the user manually types http:// into their address bar.
HSTS prevents SSL-stripping attacks and eliminates the initial unencrypted round-trip HTTP request, making the site faster and more resilient against network-level interception.
SSL Certificate & HTTPS Checker FAQs
Answers to common questions before you use this free online tool.
Why does my website need HTTPS?
HTTPS encrypts data transmitted between visitors and your web server. It prevents tampering, secures private forms and credentials, satisfies browser security standards, and supports organic search ranking.
What is HSTS (HTTP Strict Transport Security)?
HSTS is a web security header that forces compatible browsers to connect using only encrypted HTTPS connections, preventing SSL stripping and insecure HTTP downgrades.
Why are certificate issuer and expiration dates not shown?
In serverless edge runtimes like Cloudflare Workers, standard fetch handles TLS negotiation at the edge network layer without exposing raw X.509 certificate fields to application code. Rather than fabricating placeholder data, we transparently disclose this limitation.
What should I do if HTTP does not redirect to HTTPS?
Configure your web server, CDN, or hosting provider (e.g., Cloudflare, NGINX, Apache, or Vercel) to automatically redirect all incoming port 80 HTTP traffic to the HTTPS version with a 301 redirect.
Does having SSL guarantee complete site security?
No. SSL/TLS encrypts data in transit between the client and server. Complete website security also requires robust authentication, security headers, updated software, and secure application code.