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SSL Certificate Checker

Verify SSL certificates, check expiration dates, and validate certificate chains

🔒
Certificate Valid
The SSL certificate is valid and trusted
📋 Certificate Information

đŸĸ Issued To

Common Name -
Organization -
Domain -

👤 Issued By

Issuer -
Issuer Organization -

📅 Validity Period

Valid From
-
-
Valid Until
-
-

🔐 Security Details

Protocol -
Key Algorithm -
Signature Algorithm -
Serial Number -

⚡ Quick Checks

🛠ī¸ What We Check

  • Certificate validity
  • Expiration date
  • Issuer information
  • Domain matching
  • Protocol version
  • Encryption strength
  • Certificate chain

ℹī¸ About SSL/TLS

SSL/TLS certificates encrypt data transmitted between your browser and a website, ensuring secure communication and verifying the website's identity.

What is SSL Certificate Checker?

SSL Certificate Checker verifies and analyzes SSL/TLS certificates installed on any website. It displays certificate validity, expiration dates, issuer information, encryption strength, and certificate chain details. Essential for monitoring website security and preventing certificate expiration issues.

Key Features

Certificate Validity

Instantly verify if an SSL certificate is valid, expired, or revoked with visual status indicators.

Expiration Tracking

See exactly when certificates expire with countdown timers and timeline visualization.

Issuer Information

Identify the Certificate Authority (CA) that issued the certificate and verify trust chain.

Encryption Details

Check encryption algorithm, key size, signature algorithm, and protocol support.

Certificate Chain

View the complete certificate chain from root CA to end-entity certificate.

Quick Domain Tests

One-click testing of popular websites to compare certificate configurations.

How to Use

  1. Enter Domain: Type the domain name (e.g., example.com) without https:// prefix.
  2. Check Certificate: Click "Check SSL" to retrieve and analyze the SSL certificate.
  3. Review Status: Check the validity status banner showing if the certificate is valid or has issues.
  4. Check Expiration: Review the certificate timeline to see issued and expiration dates.
  5. Analyze Details: Examine issuer, subject, encryption algorithm, and serial number information.

Frequently Asked Questions

What is an SSL certificate?

An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates a website's identity and enables encrypted connections. It contains the website's public key, domain name, issuing authority, and validity period. Modern certificates use TLS (Transport Layer Security) protocol but are still commonly called SSL certificates.

What happens when an SSL certificate expires?

When an SSL certificate expires, browsers display security warnings like "Your connection is not private" or "NET::ERR_CERT_DATE_INVALID". Users cannot access your site securely, leading to lost traffic, damaged trust, and potential SEO penalties. Search engines may also deindex pages with invalid certificates.

What's the difference between DV, OV, and EV certificates?

DV (Domain Validation) only verifies domain ownership - fastest and cheapest. OV (Organization Validation) verifies domain ownership plus business identity - shows company name in certificate. EV (Extended Validation) requires extensive verification of legal entity - previously showed green address bar, now shows organization name when clicking the padlock.

How often should I check my SSL certificate?

Check SSL certificates monthly or set up automated monitoring. Most certificates last 90 days (Let's Encrypt) to 1-2 years (commercial CAs). Always check after making server changes, switching hosting providers, or updating web server configuration. Consider using certificate monitoring services for automatic alerts before expiration.