DER to PEM Converter

Convert certificates and keys from DER format (binary) to PEM format (Base64 text) for broader compatibility and readability.

How It Works

1

Upload DER File

Upload your binary DER-formatted certificate, key, or CSR file (.der, .cer, .crt extensions).

2

Automatic Conversion

The tool reads the binary data and converts it to Base64-encoded PEM format with proper BEGIN/END headers.

3

Download or Copy PEM

Download the converted PEM file or copy the text content to use in web servers, applications, or for viewing.

Frequently Asked Questions

Why convert DER to PEM format?

PEM format is more widely supported, human-readable, and easier to work with in text editors. Most web servers and applications prefer PEM format for certificates and keys.

How can I tell if a file is in DER format?

DER files are binary and appear as unreadable characters when opened in text editors. They often have .der, .cer, or .crt extensions and are typically smaller than PEM files.

Will the conversion change the certificate content?

No, DER to PEM conversion only changes the encoding format from binary to Base64 text. All certificate information, validity, and cryptographic properties remain unchanged.

Can I convert any type of DER file?

Yes, the tool can convert DER-formatted certificates, private keys, public keys, and certificate signing requests (CSRs) to PEM format.

Is it safe to upload my certificates?

Yes, all conversion happens locally in your browser. Your certificate files are processed entirely on your device and never uploaded to external servers.

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