upload attachment .HEIC format

Dear all

my scenario is to upload photo from ios devices as attachement , but this is rejected as my service is accepting .JPG, .PNG or .BMP and not .HEIC format which is recently provided by Apple to enhance storage capacity. is there a way in server side or developed code to convert the .HEIC to .JPG with out online converter? done from server side as script or may REST service . photos online converting and setting the user ios device is not advisable for my case , as i need a solution to keep the photo uploaded as .JPG format from devices use iosv11.0 through browsers.