Converting certificate keystore from JKS to P12 - MettupalliInc/ApplicationSecurity GitHub Wiki

keytool -importkeystore -srckeystore [MY_KEYSTORE.jks] -destkeystore [MY_FILE.p12] -srcstoretype JKS -deststoretype PKCS12 -deststorepass [PASSWORD_PKCS12] -srcalias [ALIAS_SRC] -destalias [ALIAS_DEST]

More details on https://www.tbs-certificates.co.uk/FAQ/en/627.html