Quick check popular websites:
Why Check Your SSL Certificate?
An SSL/TLS certificate is what makes the padlock icon appear in your browser. It encrypts data between your visitors and your server. Without it, passwords, credit cards, and personal data are sent in plain text that anyone can intercept.
AI chatbots cannot check your real SSL certificate. They can only tell you general facts about SSL. This tool actually connects to your server and tests its real TLS configuration.
What the Grades Mean
- A+ — Exceptional. Best possible configuration.
- A — Very good. Strong configuration with minor improvements possible.
- B — Needs improvement. Some TLS weaknesses detected.
- C — Poor. Significant security issues that should be fixed immediately.
- F — Failed. TLS is broken or virtually absent.
- T — No trust. Certificate is not trusted by browsers.
Common SSL Problems This Tool Detects
- Expired certificates — visitors see "Your connection is not private" error
- Misconfigured chains — intermediate certificates missing
- Weak cipher suites — vulnerable to BEAST, POODLE attacks
- Missing HSTS — browser doesn't enforce HTTPS
- Outdated TLS versions — TLS 1.0/1.1 are deprecated
- Missing Forward Secrecy — past sessions can be decrypted
How to Fix Common Issues
- Grade B or lower: Disable TLS 1.0 and 1.1, remove weak ciphers
- Missing HSTS: Add
Strict-Transport-Securityheader - Certificate chain: Install all intermediate certificates on your server
- OCSP Stapling: Enable on your server for faster validation
- Want A+? Use Cloudflare (free) or configure TLS 1.3 only with ECDHE cipher suites
Why AI Cannot Replace This Tool
AI chatbots can explain what SSL is, but they cannot:
- Connect to your actual server and test its TLS handshake
- Detect real-time certificate expiry for any domain
- Test cipher suites against known vulnerabilities
- Verify certificate chain completeness
- Check HSTS, OCSP stapling, and other headers
This tool does all of that by running a real TLS assessment powered by Qualys SSL Labs.
Privacy
We use the free Qualys SSL Labs API. Your domain name is sent to SSL Labs for scanning. We do not store or log any scan results. SSL Labs may cache results for up to 24 hours.
Frequently Asked Questions
How does SSL Certificate Checker work?
Free SSL checker. Scan any website for TLS security and certificate validity. Get grade A+ to F. No signup. AI cannot test real SSL certificates. Everything runs locally in your browser for instant results and maximum privacy.
Is my data private when I use SSL Certificate Checker?
Yes. SSL Certificate Checker runs entirely in your browser using client-side JavaScript. Your input is never uploaded to any server, never logged, and never shared. Closing the tab clears everything from memory.
Do I need to sign up or create an account to use SSL Certificate Checker?
No. SSL Certificate Checker is 100% free with no signup, no email registration, no payment, and no ads. Open the page and start using it immediately.
Does SSL Certificate Checker work without an internet connection?
SSL Certificate Checker must reach public authoritative servers (DNS resolvers, WHOIS, certificate transparency logs, or exchange APIs) to fetch live data, so it requires an internet connection for live queries. Browser-based processing itself runs locally.
Comments & Ratings