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openssl x509 — OpenSSL command to manage X.509 certificates. More information: <https://docs.openssl.org/master/man

Submitted by: @import:tldr-pages·Mar 2, 2026·

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certificatescommand509opensslclimanageopenssl x509

Problem

How to use the openssl x509 command: OpenSSL command to manage X.509 certificates. More information: <https://docs.openssl.org/master/man1/openssl-x509/>.

Solution

openssl x509 — OpenSSL command to manage X.509 certificates. More information: <https://docs.openssl.org/master/man1/openssl-x509/>.

Display certificate information:

openssl x509 -in {{filename.crt}} -noout -text

Display a certificate's expiration date:

openssl x509 -enddate -noout -in {{filename.pem}}

Convert a certificate between binary DER encoding and textual PEM encoding:

openssl x509 -inform {{der}} -outform {{pem}} -in {{original_certificate_file}} -out {{converted_certificate_file}}

Store a certificate's public key in a file:

openssl x509 -in {{certificate_file}} -noout -pubkey -out {{output_file}}

Code Snippets

Display certificate information

openssl x509 -in {{filename.crt}} -noout -text

Display a certificate's expiration date

openssl x509 -enddate -noout -in {{filename.pem}}

Convert a certificate between binary DER encoding and textual PEM encoding

openssl x509 -inform {{der}} -outform {{pem}} -in {{original_certificate_file}} -out {{converted_certificate_file}}

Store a certificate's public key in a file

openssl x509 -in {{certificate_file}} -noout -pubkey -out {{output_file}}

Context

tldr-pages: common/openssl x509

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