We use cookies to understand how the site is used and to display ads. Analytics and advertising only run after you accept. You can change your choice anytime via the footer link or your browser settings. Privacy policy

Skip to content
>_devvkit

PEM Certificate Inspector

Decode PEM certificates: subject, issuer, SANs, key details, fingerprints.

//Share this tool
//Related tools
JSON Formatter
Format, validate, minify, and prettify JSON data instantly.
JWT Decoder
Decode and inspect JWT tokens: header, payload, signature, expiration.
Base64 Encoder/Decoder
Encode text or files to Base64 and decode back. UTF-8 safe.
Regex Tester
Test regular expressions in real-time with match highlighting and groups.

Decode PEM certificates and certificate chains locally: subject, issuer, validity, SANs, key type, and SHA-256 fingerprint. Get expiry warnings before your cert silently fails in production.

[x]Features
  • -Parses full chains with multiple certificates
  • -Subject, issuer, and validity dates in your timezone
  • -DNS and IP SAN extraction
  • -RSA/EC public key type and bit size
  • -SHA-256 fingerprint with hex format
  • -Self-signed detection and chain-root warnings
>Use Cases
  • >Verifying an SSL certificate before deploying
  • >Debugging "certificate not trusted" errors
  • >Auditing expiry across staging and prod certs
  • >Confirming SANs after CSR generation

Frequently Asked Questions

>Is my certificate sent to a server??
No. The PEM file is parsed locally in your browser using node-forge. Your certificate never leaves your device.
>What can I inspect??
Subject and issuer details, validity dates, SANs (domains and IPs), public key type and size, SHA-256 fingerprint, and self-signed detection. Chain files with multiple certificates are all parsed.
>Why is the certificate expiring soon warning red??
Certificates expiring within 30 days are flagged so you can renew before downtime — the threshold matches common monitoring practice.