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OpenSSL CommandsIntermediate
OpenSSL File Format Conversion
Convert between PEM, DER, and PKCS#12 formats using OpenSSL. Step-by-step commands for certificate format conversion.
Interactive Demo
OpenSSL File Formats - Command Visualizer
See what happens when you run common OpenSSL commands
Command to Test:
$ openssl x509 -in mystery.crt -text -noout
Select Scenario:
Step 0 of 4
Click "Run Command" to see what happens
Key Insight
Understanding certificate file formats is essential for troubleshooting SSL/TLS issues. PEM is text-based and human-readable, DER is binary and compact, while PFX/PKCS#12 bundles keys and certificates together.
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