SSL Checker

Check the SSL certificate status, validity, and details for any website instantly.

The free SSL Checker scans a website's domain to verify the validity, expiration date, and chain integrity of its SSL certificate. Ensure your site is secure and avoid security warnings. Check your SSL certificate now!

Quick Test Examples

Click an example to instantly check its SSL certificate

SSL Certificate Checker

Website URL

Enter a domain name (e.g., google.com) or full URL (e.g., https://example.com)

Understanding SSL/TLS Certificates

What is SSL/TLS?

SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are cryptographic protocols that provide secure communication over the internet. They encrypt data transmitted between your browser and a web server.

Encrypts sensitive data (passwords, credit cards)

Verifies website identity and authenticity

Protects against man-in-the-middle attacks

Certificate Types

Domain Validated (DV)

Basic validation - verifies domain ownership only

Organization Validated (OV)

Verifies organization identity and domain ownership

Extended Validation (EV) Highest

Rigorous verification - shows company name in browser

Certificate Authorities

Certificate Authorities (CAs) are trusted organizations that issue SSL certificates after verifying domain/organization identity.

Popular CAs: Let's Encrypt (Free), DigiCert, GlobalSign, Sectigo, GoDaddy

Why it matters: Browsers only trust certificates from recognized CAs

Best Practices

Renew Early: Renew certificates 30 days before expiration to avoid downtime

Use Strong Keys: Minimum 2048-bit RSA keys (4096-bit recommended)

Enable HSTS: HTTP Strict Transport Security forces HTTPS connections

Monitor Expiry: Set up alerts to notify you before certificates expire

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How to Use

Step-by-step guide 3 steps

1 Enter Domain: Input the full domain name or URL of the website (e.g., `www.example.com`).
2 Run Scan: Click "Check SSL Status" to initiate the certificate inspection.
3 View Report: Instantly view the certificate's validity, expiration date, issuing authority, and chain integrity. Check your SSL certificate now!

FAQ

Common questions 3 questions

How often should I use the SSL Checker?

It is essential to check when first setting up your site, and periodically (e.g., monthly) to monitor for unexpected expiration or chain issues.

What is a mixed content error?

This occurs when an HTTPS page loads unsecure (HTTP) assets, causing the browser to display a reduced security warning.

What if the certificate is expired?

Browsers will show a severe security warning, which will block most users from accessing the site.

Use Cases & Examples

Real-world applications 3 examples

Post-Migration Audit

Verify that a website migration to HTTPS was successfully executed without any SSL chain errors.

Proactive Monitoring

Set a reminder to check the certificate expiration date to prevent costly security outages.

Troubleshooting

Diagnose why a browser is showing a "Not Secure" warning despite having an SSL certificate installed.