diff --git a/.zsh-custom/functions.zsh b/.zsh-custom/functions.zsh
index 896c636..8f62023 100644
--- a/.zsh-custom/functions.zsh
+++ b/.zsh-custom/functions.zsh
@@ -21,6 +21,10 @@ checkcert()
 {
 	openssl s_client -connect "$1":443 2>/dev/null
 }
+pem2crt()
+{
+	openssl x509 -inform PEM -in "$1" -out "${1%.*}.crt"
+}
 
 # works only without tex-ending
 tex2pdf()