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11 TLS/SSL Checks — Free

Check SSL Version & TLS Certificate Security Online Free

Check SSL version, certificate expiry, and TLS configuration in one free scan. Verify TLS 1.2/1.3 support, check cipher suite strength, test OCSP stapling, HSTS, and mixed content — 11 checks that SSL Labs doesn't cover in full.

Results in under 60 secondsFaster than SSL Labs

Results in seconds · Free · No credit card

What is SSL/TLS and Why Does It Matter?

What is SSL?

SSL (Secure Sockets Layer) and its modern successor TLS (Transport Layer Security) are cryptographic protocols that encrypt data between a user's browser and your web server. When a website uses SSL/TLS, the URL starts with https:// and a padlock icon appears in the browser.

An SSL certificate is a digital certificate that authenticates your website's identity and enables encrypted connections. Without a valid SSL certificate, browsers show security warnings that drive away visitors.

Why Run an SSL Test?

  • Catch expiring certs — SSL certificates expire; a lapsed cert triggers browser warnings instantly
  • Verify TLS version — TLS 1.0 and 1.1 are deprecated; you must support TLS 1.2 or 1.3
  • Harden cipher suites — weak ciphers (RC4, 3DES) leave your site vulnerable to attacks
  • Check HSTS — HTTP Strict Transport Security forces browsers to always use HTTPS

How to fix common SSL issues: If your SSL test reveals problems, see our detailed guides on fixing certificate expiry, checking your TLS version, disabling deprecated TLS, enabling HSTS, and hardening cipher suites.

What Does Our SSL Checker Test?

Unlike cert-only tools that grade your TLS score, SecScanner runs 11 distinct checks covering the full SSL/TLS stack — click any check to learn more.

Certificate Expiry

Verifies your SSL certificate is valid and shows days until expiry. Expired certificates instantly trigger browser security warnings that drive away visitors.

Certificate Hostname & Chain

Confirms the certificate covers your domain and that the full certificate chain is trusted. A broken chain causes 'Untrusted certificate' errors even with a valid leaf cert.

TLS Version

Checks that your server supports TLS 1.2 or TLS 1.3 — the only secure protocol versions accepted by modern browsers.

Deprecated TLS Versions

Detects if your server still accepts TLS 1.0 or TLS 1.1 connections. Both are deprecated by the IETF (RFC 8996) and flagged by all major browsers.

Cipher Suite

Analyzes your server's encryption algorithms. Flags weak ciphers (RC4, 3DES, EXPORT) and verifies forward secrecy via ECDHE key exchange.

OCSP Stapling

Checks that your server pre-fetches certificate revocation status and staples it to the TLS handshake — reducing latency and protecting user privacy.

HTTPS Enabled

Confirms your website is accessible over HTTPS and the SSL/TLS certificate is installed and functioning correctly.

HTTP to HTTPS Redirect

Verifies HTTP requests are automatically redirected to HTTPS so all visitors get a secure connection, even if they type 'http://' directly.

HSTS Enabled

Checks for the HTTP Strict Transport Security header, which tells browsers to always use HTTPS for your domain and prevents protocol downgrade attacks.

HSTS Preload Readiness

Evaluates whether your HSTS configuration meets browser preload list requirements — the strongest protection against downgrade attacks.

Mixed Content

Scans for HTTP resources (images, scripts, stylesheets) loaded on HTTPS pages. Mixed content weakens encryption and triggers browser security warnings.

How It Works

1

Enter your website URL in the scanner above

2

We establish a secure connection and analyze your SSL/TLS certificate

3

TLS handshake is tested for version support and cipher strength

4

Certificate chain is validated for completeness and trust

5

You get a detailed report with actionable fix recommendations

SecScanner vs Qualys SSL Labs

Both tools check your TLS configuration. SecScanner goes further — covering security headers, DNS, and content vulnerabilities in the same scan.

FeatureSecScannerSSL Labs
SSL/TLS checks
Cipher suite analysis
Certificate chain check
TLS 1.0/1.1 deprecation check
OCSP stapling verification
HSTS configuration check
Security headers (CSP, X-Frame-Options, etc.)
DNS security (SPF, DKIM, DMARC)
Content vulnerability scan
Actionable fix guidance
Results in under 60 seconds
Continuous monitoring

Frequently Asked Questions

What does this SSL checker test?
Our SSL checker verifies your certificate expiry, TLS version (1.2/1.3), cipher suite strength, certificate chain trust, mixed content issues, HSTS configuration, and OCSP stapling. It covers 11 checks across your entire TLS/HTTPS setup.
What TLS version should my site use?
You should support TLS 1.2 and TLS 1.3 while disabling older versions (TLS 1.0, 1.1, and all SSL versions). TLS 1.3 offers the best security and performance with faster handshakes. Our TLS checker flags any deprecated versions automatically.
How does this compare to Qualys SSL Labs (SSL Test)?
Both tools check TLS configuration, certificate chain, and cipher suites. The key difference: SSL Labs gives you an A–F grade focused purely on TLS, while SecScanner covers TLS plus security headers, DNS security (SPF/DKIM/DMARC), content vulnerabilities, and HSTS — giving you a complete security picture in one scan. SecScanner is also significantly faster (under 60 seconds vs. a few minutes for SSL Labs).
How do I check my certificate chain?
Run a scan with SecScanner — the 'Certificate Hostname & Chain' check validates that your entire certificate chain is trusted and complete. A broken chain causes browser 'Untrusted certificate' errors even if your leaf certificate is valid. Common issues include missing intermediate certificates.
How do I check which cipher suites my server supports?
Our cipher suite checker analyzes your TLS handshake and identifies all supported cipher suites, flagging weak or deprecated ones (RC4, 3DES, EXPORT ciphers). You should only support strong AEAD cipher suites with ECDHE key exchange for forward secrecy.
Is this a TLS scanner too?
Yes — SecScanner is both an SSL certificate checker and a TLS scanner. It tests TLS 1.0, 1.1, 1.2, and 1.3 support, verifies cipher suite security, checks the TLS handshake, and confirms OCSP stapling is enabled. Everything you'd want from a dedicated TLS checker.
How often should I check my SSL certificate?
We recommend checking monthly. Certificates typically last 90 days (Let's Encrypt) to 1 year. Expired certificates cause browser warnings that drive away visitors. Upgrade to Pro for automated daily or weekly monitoring with email alerts when expiry is approaching.
Is this SSL checker free?
Yes — 9 of these 11 checks are included in every free scan, covering certificate expiry, TLS version, cipher suite strength, mixed content, and HSTS. Certificate Hostname & Chain validation and OCSP Stapling are part of the Pro plan ($19/month), which also adds continuous monitoring with automatic alerts when your certificate is about to expire.
What is OCSP stapling and why does it matter?
OCSP (Online Certificate Status Protocol) stapling lets your server pre-fetch a certificate revocation status from the CA and attach it to the TLS handshake. Without it, browsers must contact the CA directly for every connection — adding latency and a privacy risk. Our scanner verifies OCSP stapling is active on your server.

More Security Tools

SSL is one piece of the puzzle. Explore our other free security checkers.

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Want the Full Security Picture?

SSL is just the start. Run a full 62-check security audit covering headers, vulnerabilities, DNS, and more.

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