SSL / TLS

SSL Certificate Checker

Read the live SSL/TLS certificate and inspect expiry, issuer, subject, and SANs.

What is SSL Certificate Checker for?

SSL Certificate Checker connects to the live endpoint and reads the certificate served by the server, helping confirm domain coverage, expiry, issuer, and SANs.

Recommended workflow

  1. Enter the domain or HTTPS endpoint to check.
  2. Review expiry, issuer, subject, SANs, and certificate fingerprints.
  3. Compare the result after SSL installation or renewal.

How this tool works

SSL/TLS tools parse certificate, CSR, key, or live handshake data with OpenSSL-compatible logic. They surface subject, issuer, SAN, validity, chain, format, and key-matching details so deployment issues are easier to isolate.

Part of this tool group

Open nearby tools in the same group to cross-check, inspect deeper, or complete a small workflow.

Open SSL / TLS hub

Frequently asked questions

Where does the tool read the certificate from?

It reads the SSL/TLS certificate currently served by the server at check time.

A few nearby utilities you can open quickly when you need to check more.

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SSL Expiry Monitor

Checks SSL/TLS expiry for multiple domains or endpoints and highlights certificates nearing expiration.

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Private Key Generator

Generates RSA or ECDSA private keys in memory for CSR preparation or SSL/TLS configuration.

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CSR Generator

Generates a CSR with private key, supporting subject, SAN, RSA, and ECDSA certificate requests.

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CSR Decoder

Decodes a CSR to verify subject, SANs, public key, and signature algorithm before sending it to a CA.

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SSL Certificate Decoder

Decodes PEM/CRT certificates to show issuer, subject, SANs, serial, validity period, and fingerprints.

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SSL Converter

Converts PEM, DER, and PFX formats, creates PFX files, or extracts PFX contents in memory.

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