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CER CRT
File conversion

Convert CER to CRT

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Is it possible to convert CER to CRT?
Yes - CER converts to CRT.

.crt and .cer are essentially the same thing (an X.509 certificate); often you only need to rename, or convert between DER and PEM. 'openssl x509 -in cert.cer -out cert.crt' (add -inform/-outform to switch encoding).

Also to CRT: PFX · P12 · PEM

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert CER to CRT

Converting a .CER file to .CRT lets you open the content in software that prefers the .CRT format, though some details may change compared with the original. We are still putting together the list of programs that handle .CER files.

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

About these formats

.CER Security certificate (X.509 .cer)

A CER file is an X.509 digital certificate that binds an identity (a website, server, or publisher) to a public key, signed by a Certificate Authority. On Windows, double-click it to view…

Open .CER details →
.CRT Security certificate (X.509 .crt)

A CRT file is an X.509 digital certificate that ties an identity (a website, server, or publisher) to a public key, signed by a Certificate Authority. On Windows, double-click it to view…

Open .CRT details →