SSL Converter

Convert SSL certificates between PEM, DER, PFX/P12, and P7B/PKCS7 formats for Apache, Nginx, IIS, Tomcat, and more.

100% Free PEM / DER / PFX / P7B All Major Servers

Convert SSL Certificate Format

Convert FROM

PEM .pem / .crt / .cer

DER .der / .cer

PFX/P12 .pfx / .p12 (Windows/IIS)

P7B/PKCS7 .p7b (Java/Tomcat)

Convert TO

PEM .pem / .crt / .cer

DER .der / .cer

PFX/P12 .pfx / .p12 (Windows/IIS)

P7B/PKCS7 .p7b (Java/Tomcat)

Certificate (PEM) (required) PFX/P12 Password (required to read a password-protected PFX; optional to encrypt a new PFX) Private Key (PEM) (required for PFX/P12) CA Bundle / Chain (optional)

SSL Certificate Formats & Server Compatibility

Format	Extension	Best For	Server
PEM	.pem, .crt, .cer	Apache, Nginx, Linux	Most common
DER	.der, .cer	Java applications	Binary format
PFX/P12	.pfx, .p12	IIS, Windows, Azure	Includes private key
P7B/PKCS7	.p7b	Tomcat, Java Keystore	Chain only, no private key

4 FormatsPEM, DER, PFX, P7B

All ServersApache, Nginx, IIS, Tomcat

Nothing StoredCerts never logged

InstantConvert in milliseconds

Secure by designYour certificate data is converted instantly over an encrypted connection and never stored on our servers.

Encrypted in transitSubmitted over HTTPS/TLS — nothing is sent in plain text.

Never storedNeither the input nor the converted certificate is saved to any database or log.

No third-party sharingYour certificate data is never shared with ads, trackers, or outside services.

Processed instantlyConverted on request and discarded immediately after the response.

About SSL Converter

What Is an SSL Converter?

SSL certificates exist in several formats (PEM, DER, PFX/PKCS12, P7B) depending on the server or platform that needs them. An SSL converter transforms a certificate from one format to another so it works with whatever system you're deploying it on.

How Our SSL Converter Works

Upload your certificate file, select the source and target formats, and the tool converts it, returning a downloadable file in the new format.

How to Use the SSL Converter

Upload your certificate file
Select the current format and the target format
Click Convert
Download the converted file

Key Features

Supports major formats — PEM, DER, PFX, P7B
No command-line OpenSSL knowledge needed
Fast, browser-based conversion

Who Uses This Tool

System administrators convert certificates between formats when migrating servers or platforms. Developers prepare certificates for specific deployment environments.

Frequently Asked Questions

Which format does my server need?
This depends on your specific server software — Apache/Nginx typically use PEM, while Windows/IIS often uses PFX; check your platform's documentation if unsure.

Is this tool free?
Yes, converting SSL certificate formats is completely free.

Frequently Asked Questions

What SSL format does my server need?

Apache and Nginx use PEM (.crt / .pem). IIS and Windows servers use PFX/P12 (contains cert + key). Java and Tomcat use P7B or JKS. DER is a binary version of PEM. When in doubt, PEM works everywhere with the right conversion.

What is the difference between PEM and DER?

PEM and DER contain the same certificate data — DER is binary, PEM is the same data Base64-encoded with header/footer lines. PEM is human-readable in a text editor; DER is not. Most Linux servers use PEM.

Do I need my private key to convert?

Only when converting to PFX/P12 format, which bundles the certificate and private key together. PEM, DER, and P7B conversions only require the certificate itself. The CA bundle (chain) is optional but recommended for including intermediate certificates.

What is a CA bundle?

A CA bundle (or chain file) contains the intermediate and root certificates from your Certificate Authority. Including it ensures browsers can trace the full trust chain from your server certificate back to a trusted root CA, preventing chain errors.