SSL Certificate Checker
Online SSL certificate checker for chain validation, expiry monitoring, issuer details, and HTTPS troubleshooting
This tool creates a server-side TLS connection to the target host and returns certificate data for this request only, without persistent storage.
Check Configuration
Quick Examples
Check History
No history yet
Documentation
Overview
SSL Certificate Checker helps you inspect certificate health quickly with custom port checks, chain analysis, and security header auditing for release validation and troubleshooting.
Core Features
- Check domain/IP with custom ports for HTTPS and common TLS services.
- Inspect expiry, issuer, serial number, fingerprints, signature algorithm, and SAN list.
- Identify certificate chain levels as leaf, intermediate, and root.
- Optionally audit common security response headers.
- Keep recent check history locally for quick replay.
How to Use
- Enter a target domain or IP and choose a port.
- Optionally enable security header checking.
- Click Check Certificate and wait for the result.
- Review certificate details, chain, and header status.
Use Cases
- Pre-release inspection for certificate validity and chain completeness.
- Operations troubleshooting for expired or misconfigured certificates.
- Security baseline verification for missing response headers.
- Environment comparison using local history replay.
FAQ
Why does it show connection timeout?
The target service may not expose the selected port or network access is blocked. Verify connectivity and try again.
Why are security headers sometimes unavailable?
Some services do not support HEAD requests, or the selected port is not an HTTP/HTTPS endpoint. Certificate data can still be returned.
Is check history uploaded?
No. History is stored only in local browser storage and used for local quick-fill.