What is an SSL/HTTPS Checker?
An SSL/HTTPS checker is a tool that analyzes a website’s security certificate to ensure it is valid, properly configured, and up to date. The SSL (Secure Sockets Layer) protocol and its successor TLS (Transport Layer Security) encrypt data exchanged between the user’s browser and the web server, protecting sensitive information from interception.
Our free SSL verification tool performs an in-depth examination of your site’s certificate: expiration date, issuing certificate authority, certificate chain validity, supported protocols, and overall security configuration. It detects common issues such as expired certificates, mixed content errors, and obsolete protocols.
Since 2014, Google has used HTTPS as a ranking signal. A misconfigured or expired SSL certificate can not only harm your SEO but also drive away visitors by displaying security warnings in their browser.
How to Use the Twaino SSL/HTTPS Checker?
Using our SSL checker is straightforward and requires no special technical skills:
Step 1: Enter your domain name or complete website URL in the analysis field. The tool works with all domains, whether they use a free Let’s Encrypt certificate or a commercial certificate.
Step 2: Launch the verification. The tool establishes a secure connection with the server and analyzes the presented SSL certificate.
Step 3: Review the detailed report that includes: certificate validity, expiration date, issuer, covered domains, TLS protocol version, and encryption level.
Step 4: Follow the recommendations provided to fix any detected issues. The tool categorizes problems by severity level to help you prioritize corrections.
It is recommended to verify your SSL certificate at least once a month and set up alerts before expiration.
Why is SSL/HTTPS Crucial for SEO?
The HTTPS protocol has a multidimensional impact on your natural search engine optimization strategy:
Google Ranking Signal: Since August 2014, Google has officially confirmed that HTTPS is a ranking factor. While its weight is moderate, it can make the difference between two similarly quality pages. In 2024, over 95% of Google’s first page results use HTTPS.
User Trust: Modern browsers display a green padlock for HTTPS sites and a “Not Secure” warning for HTTP sites. This visual signal directly influences user behavior. A site marked as insecure sees increased bounce rate and decreased conversions.
Data Protection: HTTPS protects data transmitted through your contact forms, newsletter signups, and payment pages. It is a legal requirement in many countries for sites that collect personal data (GDPR in Europe).
HTTP/2 and Performance: The HTTP/2 protocol, which offers significantly better loading performance than HTTP/1.1, requires an HTTPS connection. By switching to HTTPS, you automatically benefit from the speed improvements offered by HTTP/2.
Local SEO: For local SEO, HTTPS is particularly important. Google My Business and local results favor secure sites, which is essential for businesses that depend on local traffic.
Most Common SSL Errors and How to Fix Them
Expired Certificate: This is the most frequent error. Configure automatic renewal with Let’s Encrypt or set up expiration alerts 30 days before the deadline.
Mixed Content: Your HTTPS page loads resources (images, scripts, CSS) via HTTP. Identify these resources with our tool and update the URLs to use HTTPS or relative paths.
Domain Name Not Covered: The certificate does not cover the domain or subdomain being used. Ensure your certificate includes all necessary variants (with and without www, subdomains).
Incomplete Certificate Chain: The server does not present the necessary intermediate certificates. Check your web server configuration and add any missing intermediate certificates.
FAQ
Is a free Let’s Encrypt SSL certificate as good as a paid certificate for SEO?
Yes, from an SEO perspective, there is no difference between a free Let’s Encrypt certificate and a paid certificate. Google does not distinguish between certificate authorities. Encryption and validation are identical. Paid certificates offer additional benefits such as extended validation (EV) which displays the company name, or financial guarantees, but these elements do not influence search engine rankings.
How do I know if my SSL certificate is about to expire?
Our tool displays the exact expiration date of your SSL certificate. Let’s Encrypt certificates have a 90-day validity period with automatic renewal. Commercial certificates typically last 1 year. We recommend checking your certificate at least once a month and configuring automatic renewal through your hosting provider or Certbot to avoid any service interruption.
What happens if my SSL certificate expires?
When your SSL certificate expires, browsers display a scary warning page (“Your connection is not private”) that prevents most visitors from accessing your site. Googlebot may also have difficulty crawling your pages, which can lead to gradual deindexing. Additionally, your traffic data in Google Analytics will be severely impacted. It is therefore crucial to renew your certificate before expiration.
Can switching from HTTP to HTTPS temporarily decrease my traffic?
Yes, a poorly executed HTTP to HTTPS migration can result in temporary traffic loss. To minimize this impact, ensure you implement 301 redirects from all HTTP URLs to HTTPS, update your XML sitemap, change the site URL in Google Search Console, and add the HTTPS property. A well-planned migration typically recovers its traffic within 2 to 4 weeks.
What is mixed content and why is it a problem?
Mixed content occurs when a page served over HTTPS loads resources (images, scripts, stylesheets) via unsecured HTTP. This compromises the page’s security because these unencrypted resources can be intercepted or modified. Modern browsers automatically block certain types of mixed content (scripts, iframes) and display warnings for others (images). This can break the appearance of your pages and degrade user trust.
How do I verify that all pages on my site use HTTPS?
Start by checking your homepage and main pages with our tool. Next, verify in WordPress that your site URLs (Settings > General) use https://. Check that your .htaccess file contains an HTTP to HTTPS redirect rule. Finally, use an SEO crawler to scan your entire site and detect pages that still load resources over HTTP.