SSL Converter — PEM, DER, PFX, PKCS#7
Convert your certificates between PEM, DER, PFX and PKCS#7. Runs in your browser; your files are never uploaded.
The SSL Converter transforms certificates between PEM, DER, PFX (PKCS#12) and PKCS#7 (.p7b). Apache/Nginx want PEM, Windows/IIS want PFX, and Java/Tomcat often need DER or P7B. Conversion runs entirely in your browser; since a PFX contains the private key, this keeps your key safe.
Frequently Asked Questions
Which format do I need for IIS?
Windows/IIS wants PFX (PKCS#12), which bundles the certificate and private key in one file.
What do I need to build a PFX?
The certificate and its matching private key (plus an optional password). Both are in your ZIP (certificate.crt and private.key).
Are my files uploaded?
No. All conversion happens in your browser; your certificate and private key stay on your device.