CRT to DER Converter - Convert PEM .crt Certificate to Binary .der Online | JavaInUse

Convert CRT to DER - Free Online

Convert a Base64 PEM encoded .crt certificate into binary DER format. Everything runs in your browser - your certificate never leaves your computer.

🔑 CRT to DER Converter

PEM Certificate (.crt)

Or load a .crt file:

DER Output (Base64 preview)

About CRT to DER Conversion

A .crt file usually stores an X.509 certificate in PEM format: Base64 text wrapped between -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- markers. DER is the raw binary ASN.1 encoding of the same certificate.

This converter strips the PEM headers, Base64-decodes the body and produces the binary DER bytes - the browser equivalent of openssl x509 -in cert.crt -outform DER -out cert.der.

When do you need DER?

Importing certificates into Java keystores and Windows certificate stores
Embedded devices and appliances that expect binary certificates
Tooling that cannot parse Base64 PEM text

Convert and package keys for SSH, TLS, and keystore workflows.

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