Free SSL Certificate Checker Tool

Our SSL checker performs:

1. Direct TLS handshake with your domain
2. Reads certificate metadata, such as issuer, SANs, key type
3. Validates the certificate chain up to the root CA
4. Checks expiration date & days remaining
5. Performs lightweight security checks, such as weak algorithms
6. Displays a simplified health report

Supported Protocols:

• HTTPS
• IMAPS
• POP3S
• SMTP STARTTLS
• TLS 1.2 / TLS 1.3
• IPv4 & IPv6

Common Errors We Detect:

• Certificate already expired
• Wrong hostname (domain mismatch)
• Chain not trusted
• Self-signed certificate
• Weak key or signature algorithm
• Incomplete/incorrect certificate chain

Why You Should Monitor SSL/TLS Certificates

Expired or misconfigured certificates cause:

1. Website downtime
2. Browser security warnings
3. Broken APIs
4. Failed mobile app connections
5. Lost customer trust
6. Internal outages and alert storms
7. Major incident escalations

Even large companies (Microsoft, Shopify, LinkedIn, Azure) have suffered outages caused by expired certificates.

Turn One-Time Checks Into Continuous Protection

Most teams only check certificates when an issue occurs.

This often leads to:

• Missed renewals
• Sudden outages
• Service disruption
• Emergency fixes
• Compliance failures

With CertificateManager.net you will:

• Automatically track all certificates
• Get notified well before expiration
• Never be surprised by an outage again
• Save time by eliminating manual checks