The HTTPS Checker is designed to comprehensively inspect a website HTTPS configuration and basic security status. Enter a target URL or domain to check TLS certificate validity, certificate remaining time, HTTP-to-HTTPS redirects, and common HTTPS security response headers, helping website administrators quickly identify configuration problems.
The HTTPS Checker goes beyond SSL/TLS certificate inspection and analyzes important HTTPS configuration items, including HTTP to HTTPS redirects, HSTS (Strict-Transport-Security), X-Frame-Options, Content-Security-Policy, and HTTP mixed content on HTTPS pages.
The tool checks the TLS certificate currently used by the target website and displays its status, remaining days, issuer, subject, and SAN count. This helps determine whether the HTTPS certificate is valid and whether it is approaching expiration.
The HTTP-to-HTTPS redirect check determines whether unencrypted HTTP requests are automatically redirected to HTTPS. If HTTP access does not return the expected 3xx redirect, the website may still have an unencrypted access path.
HSTS, or HTTP Strict Transport Security, is a security mechanism that instructs browsers to use HTTPS when accessing a website. Enabling HSTS can reduce the risk of HTTP access and help mitigate protocol downgrade attacks.
X-Frame-Options is a common HTTP security response header that controls whether a webpage can be embedded by another website through a frame or iframe. Proper configuration can reduce the risk of clickjacking attacks.
Content-Security-Policy (CSP) restricts the sources from which browsers can load and execute resources. A properly configured CSP can reduce the risk of cross-site scripting (XSS) and certain malicious resource injection attacks.
Mixed content occurs when an HTTPS page continues to load HTTP resources such as images, JavaScript, CSS, or external resources. Mixed content can weaken the security of an HTTPS page, so page resources should preferably use HTTPS consistently.
https://example.com or example.com.HTTPS check results normally consist of several independent checks. A valid certificate does not necessarily mean that the website HTTPS configuration is complete. HTTP redirects, HSTS, security headers, and mixed content should also be considered.
This means the TLS certificate returned by the server is within its validity period at the time of testing. You should also monitor the remaining days to avoid waiting until the certificate is close to expiration.
If the HTTP request does not receive a valid HTTP response and the result shows status code 0, it generally means that no HTTP-layer response was successfully obtained. This does not by itself prove that the website has no HTTPS redirect; network connectivity, server responses, and test conditions should also be considered.
If the HTTPS page request fails, the tool may not be able to inspect HSTS, X-Frame-Options, Content-Security-Policy, or mixed content. First check the HTTPS connection, server access restrictions, TLS configuration, and whether the target website is accessible.
HTTPS uses TLS to encrypt communication between clients and servers and uses digital certificates to help verify server identity. Correct HTTPS deployment is a fundamental network security measure for website logins, user data, APIs, and other sensitive communications.
If a website provides both HTTP and HTTPS access, HTTP requests should generally be redirected to HTTPS using an appropriate 3xx status code based on the business requirements. This reduces the chance that users continue accessing the website through unencrypted HTTP.
After HTTPS configuration is stable and all relevant resources support HTTPS, HSTS can be considered. HSTS allows supporting browsers to prefer HTTPS during subsequent visits, further reducing opportunities for unencrypted HTTP access.
SSL certificate checking focuses on the TLS certificate itself, including X.509 subject, issuer, validity period, serial number, signature algorithm, and public key. HTTPS checking has a broader scope and also evaluates HTTP-to-HTTPS redirects, HSTS, security headers, and mixed content.
Use the HTTPS Checker when you need to determine whether a website has a complete HTTPS deployment and whether redirects, security headers, or mixed content have problems. If you only need detailed SSL certificate information or expiration data, use an SSL certificate checker or certificate expiration checker.
No. A valid TLS certificate only indicates that the certificate is valid at the time of testing. Overall HTTPS security also depends on TLS protocol configuration, HTTP redirects, HSTS, security headers, resource loading, and application security configuration.
If the HTTPS page request itself fails, the tool cannot obtain the complete HTTP response headers and therefore cannot determine the HSTS configuration. Confirm that the target HTTPS service can establish a connection and return a page first.
Common causes include images, scripts, stylesheets, fonts, or third-party resources on an HTTPS page that still use HTTP URLs. Upgrade these resources to HTTPS and confirm that third-party resources support HTTPS.
A website may return different content based on client IP, User-Agent, SNI, CDN node, or network environment. Browsers may also use cache, HSTS policies, or existing connections, so browser behavior can differ from server-side test results.
The HTTPS Checker is suitable for website administrators, developers, server operators, and security professionals. It provides a quick overview of HTTPS configuration from TLS certificates, HTTPS redirects, and HTTP security response headers.
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