Certificate Format Converter

Convert certificates between common formats. Paste a PEM certificate or upload a DER file.

Or upload a DER (.der/.cer) file:

Format Reference
FormatExtensionDescription
PEM.pem, .crtBase64-encoded, text format. Most common on Linux/Apache. Starts with -----BEGIN CERTIFICATE-----
DER.der, .cerBinary format. Common on Windows and Java. Same data as PEM but not Base64-encoded.
PKCS#7.p7b, .p7cContains certificates and chain certs but no private key. Used by Windows and Java Tomcat.