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Inspect PEM certificates, keys, and CSRs in your browser.
-----BEGIN …----- and -----END …----- markers.For full ASN.1 / X.509 field decoding, paste a real certificate. This tool gives you the structure and DER bytes — pair with the SSL Cert Checker for fielded data.
Decode and inspect PEM-encoded objects — X.509 certificates, public keys, private keys, certificate signing requests, and EC keys. Identifies the object type, decodes to base64 → DER → ASN.1, and shows a human-readable summary. Everything runs in your browser; keys never leave your device.
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