Free SSL/TLS Certificate Decoder

Upload or paste any SSL/TLS certificate (.crt, .cer, .pem, .der). Instantly decode Subject, Issuer, Validity, Public Key details, Fingerprints and more — locally in your browser.

PEM / DER Converter

Convert certificate encoding formats.

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PKCS#12 Exporter

Bundle certs + private keys into .p12

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HMAC Generator

Sign API requests with shared secret keys.

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Certificate Input

Upload Certificate

Drop .crt / .cer / .pem / .der here or click to browse

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Certificate Summary

Common Name (CN) -

Organization (O) -

Issuer -

Valid -

Public Key -

Fingerprints

SHA-256 -

SHA-1 -

Subject Alternative Names

Distinguished Names

Extensions

Saved Certificates

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Paste or upload a certificate to decode.