Use an online HEIC to JPG converter
Open the HEIC file in Preview on Mac and export it as JPG
Open the HEIC file in the Photos app on iPhone and share or save it as JPG
Use Windows Photos or a HEIC-compatible app and save or export as JPG
Install a HEIC converter app on your phone or computer
Drag and drop the HEIC file into a conversion tool and choose JPG
Change the camera settings on your iPhone to save future photos as JPG instead of HEIC
Use batch conversion software if you need to convert multiple HEIC files at once