Free PEM / DER Converter

Convert between PEM and DER formats for keys and certificates. Paste content or upload files, auto-detect type, and get clean PEM or Base64/HEX DER output locally in your browser.

SSH Key Generator

Generate SSH key pairs in OpenSSH & PEM formats.

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Password Strength Checker

Verify the strength of your key passphrases.

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SSH Key Generator

Generate PKCS8 PEM keys to convert into DER.

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Upload PEM / DER File

Drop a .pem / .crt / .cer / .der file here or click to browse

We never upload files — everything stays in your browser.

Input Data

PEM is human-readable text with BEGIN/END headers. DER is the raw binary form (shown here as Base64 or HEX).

Conversion Direction

Auto detect chooses PEM → DER if it finds -----BEGIN headers, otherwise DER → PEM.

PEM Label (for DER → PEM)

This sets the -----BEGIN ...----- header when converting from DER to PEM.

Options Prefer HEX view for DER output Mask output on screen (blur sensitive data)

Conversion Summary

Waiting for input…

Detected Format: -

Direction: -

PEM Label: -

Data Size: -

Mask preview

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Upload a PEM/DER file or paste content to start converting.