SSL Checker

An expired or misconfigured SSL certificate quietly breaks trust — browsers throw warnings and traffic drops. This checker connects to any domain over HTTPS and reports back the certificate's issuer, validity dates, days remaining until expiration, the full certificate chain, and the protocol/cipher in use. It also flags common issues like self-signed certificates, hostname mismatches, or an incomplete chain. Bookmark it for a quick health check before a certificate renewal deadline sneaks up on you.

Domain Name to Inspect

Verifies SSL certificate validity, expiration dates, issuing authority, and SAN coverage.

Verify HTTPS Certificates and Avoid Breakage

An expired, invalid, or misconfigured SSL/TLS certificate instantly triggers browser warnings, blocks site access, and damages user trust. Proper certificate management requires monitoring expiration dates, checking chain completeness, and ensuring strong encryption protocols are in place.

The SSL Checker establishes a secure connection to any domain over HTTPS, delivering a comprehensive health report on its security credentials in seconds.

Key Features

  • Expiration Tracking: View exact validity start/end dates and the precise number of days remaining before expiration to prevent unexpected downtime.
  • Chain Validation: Inspect the complete certificate chain—from the leaf certificate up through intermediate authorities to the trusted root CA—to catch missing intermediate certificate issues.
  • Hostname & Issuer Analysis: Verify domain matching to prevent hostname mismatch errors (ERR_CERT_COMMON_NAME_INVALID) and confirm trusted Certificate Authority (CA) issuers.
  • Protocol & Cipher Inspection: Identify supported TLS protocol versions (TLS 1.2, TLS 1.3) and active cipher suites to ensure compliance with current security standards.
  • Automatic Error Detection: Instantly flag common vulnerabilities, including self-signed certificates, revoked credentials, or weak signature algorithms.

Common Use Cases

  • Renewal Planning: Audit expiration timelines across your domain portfolio to schedule timely certificate renewals.
  • Migration & Installation Checks: Verify that newly installed SSL/TLS certificates and intermediate chains are correctly configured after web server migrations.
  • Security & Compliance Audits: Ensure legacy, insecure protocols (like SSL v3, TLS 1.0, or TLS 1.1) are disabled on your public servers.

Enter a domain name above to run a complete SSL/TLS certificate health check immediately.