Format Converter

Convert certificates between PEM, DER, PKCS12, and PKCS7 formats

About Certificate Formats

SSL/TLS certificates come in several standard formats: PEM (Base64-encoded, most common), DER (binary format), PKCS12 (archive format for bundling certificates and private keys), and PKCS7 (signed data format). Our Format Converter enables quick conversion between these formats without needing OpenSSL command-line tools, making certificate management accessible to everyone.

How to Use

Select the conversion type from the mode buttons (e.g., PEM to DER).
Paste your certificate data into the input text area shown.
Optionally enter a password for PKCS12-related conversions.
Click Convert to transform the certificate and copy the output.

Use Cases

Server Deployment: Convert certificates to the format required by your web server or application.
Legacy System Migration: Convert DER certificates to PEM for compatibility with modern tools.
Certificate Bundling: Package certificates and private keys into PKCS12 for easy distribution.
Platform Compatibility: Convert between formats when moving certificates between Windows, Linux, and macOS systems.

Frequently Asked Questions

PEM is a Base64-encoded text format with header and footer lines (e.g., -----BEGIN CERTIFICATE-----), making it human-readable and easy to copy. DER is the binary encoding of the certificate in ASN.1 format. PEM is more commonly used for web servers while DER is used on some platforms like Java and Windows.

This tool converts certificate files between formats, not private keys. For private key conversion, use OpenSSL command-line tools. PKCS12 conversion handles both certificates and private keys together when you provide the correct password.

PKCS7 (also called P7B) is a format used for certificate chains and signed data. It usually contains only certificates (no private keys) and is commonly used by Microsoft Windows and Java for certificate distribution. It is Base64-encoded with -----BEGIN PKCS7----- headers.

Tips & Best Practices

•Convert certificates to the format required by your target server
•Verify converted certificates load correctly before deployment
•Keep original certificate files as backups after conversion
•Understand format differences when converting between PEM, DER, P7B, PFX

Technical Details

Formats: PEM, DER, P7B/PKCS#7, PFX/PKCS#12 conversion
Components: Certificate, key, and chain conversion
Security: Password-protected format handling
Output: Converted certificate files with validation