Certificate Format Check

X.509 certificate format check, parse certificate info and preview certificate chain.

Certificate (PEM)

Intermediate Certificate (Optional)

Usage

Certificate Chain Principle

X.509 certificate chain is a trust hierarchy of end-entity certificates, intermediate certificates, and root CA certificates. Full verification requires checking issuance relationships, validity, and revocation status level by level up to a trusted root CA. This tool only performs format checks, not signature chain verification.

Steps

1. Paste the PEM-format end-entity certificate in the "Certificate" box; 2. If you have intermediate certificates, paste them in the "Intermediate Certificate" box; 3. Click "Parse Certificate"; 4. View certificate info and format check results.

Check Items

PEM format validity check, Base64 decode, public key importability, intermediate certificate format check. This tool only checks certificate format, not signature chain, validity, or revocation status. For production use, please use professional tools like OpenSSL.