Free SSL certificate verification tool
Check the SSL status, validity and technical details of any domain. An essential tool for website administrators and security professionals.
SSL (Secure Sockets Layer) certificates are digital certificates that verify a website's identity and enable an encrypted connection between browser and server. This ensures secure data communication and protection against interception.
Encrypted traffic between your browser and the domain
Proves website authenticity
Prevent security warnings from browsers
Enter a domain name to check the SSL certificate:
This free SSL checker is provided by WebOké
Understand how SSL/TLS encryption works and why it's essential for modern websites
SSL works as a secure connection between your browser and the website. You can think of it as an encrypted tunnel that only you and the website can see through - all information passing through is unreadable to others.
When establishing this secure connection, the website first shows its SSL certificate - a kind of digital identity document. Your browser automatically checks whether this certificate is valid and trustworthy. If everything is in order, they exchange a unique key that encrypts all further communication. This all happens in a fraction of a second, without you noticing anything.
TLS 1.3 is the current standard, with improved speed and security. Older versions like SSL 2.0/3.0 and TLS 1.0/1.1 are deprecated and their use increasingly causes problems.
Modern browsers automatically support the highest available TLS version, but servers must be configured correctly.
CAs are trusted organizations that verify the identity of certificate applicants. Browsers have a built-in list of trusted root CAs.
The trust model works hierarchically: root CAs sign intermediate certificates, which in turn issue end-user certificates.
Technical questions and answers about SSL certificates
TLS (Transport Layer Security) is the successor to SSL. Technically we use TLS nowadays, but the term SSL has stuck. TLS 1.0 came out in 1999 as an improvement to SSL 3.0.
The current standard is TLS 1.3, which offers significant improvements in both security and performance over earlier versions.
Since September 2020, the maximum validity period for SSL certificates is 398 days (about 13 months). This is an industry standard set by the CA/Browser Forum.
Let's Encrypt certificates are valid for 90 days but can be automatically renewed. Shorter validity periods increase security through regular key rotation.
Mixed content occurs when an HTTPS page loads resources via insecure HTTP connections. This undermines security and browsers often block this content.
Solution: Update all URLs in your HTML, CSS and JavaScript to HTTPS. Use relative URLs (//domain.com) or protocol-relative URLs where possible.
With modern implementations, the performance impact of SSL/TLS is minimal. TLS 1.3 has optimized the handshake to just 1 round-trip.
HTTP/2, which requires SSL, even offers performance benefits through multiplexing and server push. With proper configuration, an HTTPS site can be faster than HTTP.
Wildcard certificates secure a domain and all subdomains at one level (*.example.com covers blog.example.com, shop.example.com, etc.).
Multi-domain (SAN) certificates can secure multiple specific domains (example.com, example.net, blog.example.org) in one certificate.
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