Free Online SSL / TLS Certificate Inspector: Verify HTTPS Expiration and Chain

Ensuring valid HTTPS security for your web applications, APIs, and domain infrastructure is essential for protecting user privacy and preventing web browser security warnings. Expired SSL or TLS certificates, incomplete certificate chains, or mismatched Subject Alternative Names (SANs) can instantly break website traffic, cause payment gateway errors, and degrade search engine rankings.

Checking SSL certificate details directly from web browsers often hides technical metadata like serial numbers, intermediate Certificate Authority (CA) signatures, or revocation status details. Developers and DevOps engineers need a fast way to audit HTTPS endpoints without installing local OpenSSL command line utilities.

In this guide, we will explore how to audit HTTPS configurations safely using Velona's Free Online SSL / TLS Certificate Inspector, a stateless tool that retrieves and analyzes certificate metadata in real time.

Why Auditing SSL and TLS Certificates Matters

HTTPS certificates do far more than just enable the padlock icon in address bars. Auditing your domain certificate configurations helps prevent several critical production issues:

• Prevent Outages From Expiration: Automated certificate tools like Let's Encrypt renew every 90 days. Tracking expiration dates ensures auto-renewal cron jobs operate correctly before certificates expire.
• Verify Certificate Chain Integrity: Missing intermediate CA certificates will cause security errors on mobile devices and legacy browsers even if the leaf certificate itself is valid.
• Validate Subject Alternative Names (SANs): Ensuring all required subdomains (such as api.example.com or app.example.com) are listed in the multi-domain certificate.
• Audit Cryptographic Protocols: Verifying modern signature algorithms like SHA-256 and checking public key sizes.

How to Use the Free Online SSL / TLS Certificate Inspector

You can inspect any HTTPS website or API hostname directly in your web browser:

1. Navigate to the Velona SSL / TLS Certificate Inspector Tool.
2. Enter the target domain name or hostname (for example, api.github.com or velona.in).
3. Click Inspect Certificate to initiate an automated SSL handshake query.
4. Review the detailed breakdown showing leaf certificate metadata, issuer authority, validity dates, SAN lists, and full certificate chain hierarchy.

Like all utilities in Velona's developer fleet, queries run statelessly in memory without storing domain names or logging inspection requests. You can use the tool completely anonymously, or log into your Free Velona Account to save recent execution history on your dashboard.

Programmatic API Access: Inspecting Certificates in Code

Need to automate HTTPS certificate monitoring inside deployment pipelines, health check scripts, or uptime monitoring bots? Velona provides a dedicated API endpoint (/tools/v1/ssl-cert).

Every registered user automatically receives a non-billable Developer Tools API Key on their API Keys Dashboard that requires zero wallet balance to use.

Example: Querying SSL Certificate Status via cURL

curl -X POST https://velona.in/tools/v1/ssl-cert \
  -H "Authorization: Bearer YOUR_FREE_DEV_KEY" \
  -H "Content-Type: application/json" \
  -d '{"domain": "velona.in"}'

Example Response:

{
  "result": {
    "domain": "velona.in",
    "is_valid": true,
    "issuer": "Let's Encrypt Authority X3",
    "subject_cn": "velona.in",
    "valid_from": "2026-06-01T00:00:00Z",
    "valid_until": "2026-08-30T23:59:59Z",
    "days_remaining": 34,
    "sans": ["velona.in", "*.velona.in"],
    "signature_algorithm": "sha256WithRSAEncryption"
  },
  "request_id": "req_e5f6a7b8c9d0"
}

Explore 49 Life Time Free Developer Utilities

The SSL / TLS Certificate Inspector is part of Velona's 49 Life Time Free Developer Tools Fleet, a complete collection of infrastructure and security utilities. Popular companion tools include:

• HTTP Security Headers Auditor: Analyze CSP, HSTS, and X-Frame-Options security policies.
• DNS Propagation Checker: Test DNS record updates across 30 global resolvers.
• JWT Decoder & Inspector: Debug OAuth2 Bearer tokens and payload claims safely.
• WHOIS & Domain Lookup: Inspect domain registrar records and creation timestamps.

Want to build AI automated apps alongside your security workflows? Try our Free Public Chat Playground, check real-time INR model rates on our Pricing Index, or sign up for a free Velona account to claim your free API key today!