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SSL Certificate Converter

Convert SSL/TLS certificates between PEM, DER and PFX/P12 formats. Parse certificate details, extract from PKCS12 bundles.

Paste a PEM certificate below, or upload a .crt / .pem / .der file to inspect its details.

📁 Upload file

Paste a PEM certificate or private key. Downloads as binary .der file.

Upload a binary .der / .cer file, or paste base64-encoded DER.

📁 Upload .der file

Upload a PKCS#12 (.pfx / .p12) file exported from IIS, Windows or macOS Keychain. Enter the export password if required.

📁 Upload .pfx file

Provide your certificate (.crt) and private key (.key) in PEM format. Set an export password for the PFX (recommended).

Certificate (PEM)

Private Key (PEM)

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Base64-encoded text format. Starts with -----BEGIN…. Default for nginx, Apache, OpenSSL. Can contain cert + key in one file.

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Binary format — the raw ASN.1 encoding of X.509. Used by Java (keytool), older Windows tools. Not human-readable.

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PKCS#12 bundle — can contain cert + private key + certificate chain in one password-protected binary file. Used by IIS, Windows, macOS.

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Certificate processing happens on our server. Never paste production private keys on untrusted tools. Use only test/staging keys here.