How do I convert a .cer/.der to .pem?

Upload the .cer/.der file, select PEM as output, and convert. The tool encodes the certificate in Base64 and wraps it with the proper BEGIN/END headers.

Can I create a .pfx from a PEM?

Yes. Your PEM must contain both the CERTIFICATE and PRIVATE KEY blocks. Provide a password and export to PFX.

My PFX asks for a password. What should I do?

Enter the password used when the PFX was created. Without the correct password, the PFX cannot be opened.

SSL Certificate Converter

Convert between PEM, DER and PFX in your browser with secure server-side OpenSSL processing.

Upload your file (.pem, .der, .cer, .pfx/.p12).

Choose output: PEM, DER, or PFX.

For PFX import/export, provide the password if required.

SSL Certificate Converter by Diajzs

What you can convert

DER (.der/.cer) ↔ PEM (.pem) for X.509 certificates
PFX (.p12/.pfx) → PEM bundle (certificate + private key + chain)
PEM (cert + key) → PFX with your chosen password

Tips

PFX exports require both a certificate and its private key in PEM.
Importing PFX needs the correct password from your issuer or keystore.
Keep private keys secure. Do not share them publicly.

Common uses

Install certs on servers requiring PEM (Nginx/Apache).
Upload DER to systems that expect binary X.509.
Create a single PFX for IIS/Windows from PEM materials.