PEM to DER Converter

Convert certificates and keys from PEM format (Base64 text) to DER format (binary) for different applications and systems.

How It Works

1

Input PEM Data

Paste your PEM-formatted certificate, key, or CSR with the BEGIN/END headers, or upload a .pem file.

2

Automatic Conversion

The tool decodes the Base64 content and converts it to binary DER format while preserving the cryptographic data.

3

Download DER File

Download the converted binary file with the appropriate extension (.der, .cer, .crt) for use in your target system.

Frequently Asked Questions

What's the difference between PEM and DER formats?

PEM is Base64-encoded text with BEGIN/END headers, human-readable and widely used. DER is binary format, more compact and preferred by some applications like Java keystores.

When should I use DER instead of PEM?

Use DER for Java applications, Windows certificate stores, some mobile platforms, and when you need the most compact binary representation of certificates.

Will conversion affect the certificate validity?

No, PEM to DER conversion only changes the encoding format. The cryptographic content, validity dates, and all certificate information remain identical.

Can I convert private keys as well?

Yes, the tool can convert PEM-formatted private keys, public keys, certificates, and CSRs to DER format while maintaining their cryptographic properties.

Is the conversion process secure?

Yes, all conversion happens locally in your browser. Your certificates and keys are never transmitted to external servers or stored anywhere.

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