X.509 Certificate Decoder

OpenSSL Commands

# View certificate details openssl x509 -in cert.pem -text -noout # Check certificate expiry openssl x509 -in cert.pem -noout -dates # Get certificate from server echo | openssl s_client -connect example.com:443 2>/dev/null | openssl x509 -text # Verify certificate chain openssl verify -CAfile ca-bundle.crt cert.pem

X.509 Field Reference

FieldDescription
CN (Common Name)Domain or entity name
SANSubject Alternative Names — additional domains
O (Organization)Organization name
IssuerCertificate Authority that issued the cert
Not Before/AfterValidity period
Serial NumberUnique identifier from CA

Verwandte Werkzeuge

🔒 MD5 Hash Generate MD5 hash of text 🔒 SHA1 Hash Generate SHA1 hash of text 🔒 SHA256 Hash Generate SHA256 hash of text 🔒 SHA512 Hash Generate SHA512 hash of text 🔒 SHA3 Hash Generate SHA3-256 hash of text 🔑 HMAC Generator Generate HMAC auth codes with key 🔑 Bcrypt Hash Generate and verify bcrypt hashes 🔐 AES Encrypt/Decrypt AES symmetric encrypt and decrypt 🎲 UUID Generator Generate v1/v4/v5 standard UUIDs 🎲 ULID Generator Generate sortable ULID identifiers 🎲 Nano ID Generator Generate compact random string IDs 🔑 Password Generator Generate secure random passwords