Free SSL Certificate Checker

Check the SSL certificate status, expiry date, and HTTPS configuration for any domain. Verify that HTTP redirects to HTTPS, HSTS is enabled, and your certificate is not expired or expiring soon — all critical factors for security and SEO.

Check SSL Certificate

Why SSL and HTTPS Matter for SEO

Google has used HTTPS as a ranking signal since 2014, and the weighting has increased over time. Beyond ranking, HTTPS is fundamentally a user trust signal — browsers display "Not Secure" warnings for HTTP pages, which can cause visitors to immediately leave. Chrome now marks all HTTP sites as not secure by default.

An expired or misconfigured SSL certificate is one of the most damaging technical issues a site can have. When a certificate expires, visitors see a full-page browser warning that most users will not bypass. Search engines may also de-rank or deindex pages they cannot access securely.

What This Tool Checks

HTTPS Availability

Verifies that your site loads correctly over HTTPS. If HTTPS is not working, visitors will see browser security warnings and search engines may penalize your rankings.

HTTP → HTTPS Redirect

Confirms that HTTP visitors are automatically redirected to the secure HTTPS version. Without this, some users may access the insecure version, and you may have duplicate content issues.

HSTS Header

HTTP Strict Transport Security (HSTS) instructs browsers to always use HTTPS for your domain, even if someone types "http://" directly. This prevents downgrade attacks and mixed content issues.

Certificate Details

Shows certificate issuer, validity period, and days remaining from the crt.sh certificate transparency log. Get advance warning before your certificate expires.

SSL Certificate Best Practices

Renew certificates at least 30 days before expiry — set calendar reminders or use a certificate management tool with auto-renewal (Let's Encrypt offers free 90-day certificates with automated renewal).
Enable HSTS with a long max-age — start with a short max-age (e.g., 3600 seconds) to test, then increase to 31,536,000 (1 year) once you are confident in your HTTPS setup.
Use a 301 redirect from HTTP to HTTPS — not a 302, to ensure link equity is properly transferred to the HTTPS version.
Fix mixed content warnings — ensure all resources (images, scripts, stylesheets) on your HTTPS pages are loaded over HTTPS, not HTTP.
Consider HSTS preloading — once your HSTS header is stable, submit your domain to the HSTS preload list so browsers enforce HTTPS before making any HTTP request at all.

Track Your Brand Across Google & AI

QuickSEO connects your Google Search Console data with AI visibility tracking across ChatGPT, Claude, and Gemini — all in one dashboard.

Try QuickSEO Free →

Related Tools

HTTP Header Checker

Inspect HTTP response headers for security and performance issues.

Redirect Checker

Analyze redirect chains and verify HTTP to HTTPS redirects.

E-E-A-T Checker

Analyze Experience, Expertise, Authority and Trust signals.

Why SSL and HTTPS Matter for SEO

What This Tool Checks

HTTPS Availability

Verifies that your site loads correctly over HTTPS. If HTTPS is not working, visitors will see browser security warnings and search engines may penalize your rankings.

HTTP → HTTPS Redirect

Confirms that HTTP visitors are automatically redirected to the secure HTTPS version. Without this, some users may access the insecure version, and you may have duplicate content issues.

HSTS Header

HTTP Strict Transport Security (HSTS) instructs browsers to always use HTTPS for your domain, even if someone types "http://" directly. This prevents downgrade attacks and mixed content issues.

Certificate Details

Shows certificate issuer, validity period, and days remaining from the crt.sh certificate transparency log. Get advance warning before your certificate expires.

SSL Certificate Best Practices

Renew certificates at least 30 days before expiry — set calendar reminders or use a certificate management tool with auto-renewal (Let's Encrypt offers free 90-day certificates with automated renewal).

Enable HSTS with a long max-age — start with a short max-age (e.g., 3600 seconds) to test, then increase to 31,536,000 (1 year) once you are confident in your HTTPS setup.

Use a 301 redirect from HTTP to HTTPS — not a 302, to ensure link equity is properly transferred to the HTTPS version.

Fix mixed content warnings — ensure all resources (images, scripts, stylesheets) on your HTTPS pages are loaded over HTTPS, not HTTP.

Consider HSTS preloading — once your HSTS header is stable, submit your domain to the HSTS preload list so browsers enforce HTTPS before making any HTTP request at all.

Track Your Brand Across Google & AI

QuickSEO connects your Google Search Console data with AI visibility tracking across ChatGPT, Claude, and Gemini — all in one dashboard.

Try QuickSEO Free →