Example input/output
Input: -----BEGIN CERTIFICATE-----
MIID...-----END CERTIFICATE-----
Output: Type: Certificate / Subject: CN=example.com / Key Type: RSA 2048
How it works
This tool base64-decodes the PEM payload and parses the resulting DER-encoded ASN.1 structure using a JavaScript parser. It identifies the PEM type from the header and decodes fields such as subject, issuer, public key algorithm, and key size. Processing runs in your browser.
Common use cases
- Inspect SSL/TLS certificate details from a PEM-encoded certificate
- Verify certificate expiry dates and subject alternate names
- Debug certificate chain issues by examining individual PEM blocks