Use an online HEIC to JPG converter
Open the HEIC file in a photo app and export or save as JPG
On iPhone, transfer the photo to a computer and convert it with Photos, Preview, or an image converter
On Mac, open the HEIC file in Preview and export it as JPG
On Windows, install a HEIC codec or use a converter app, then save as JPG
Use Adobe Photoshop or another image editor to open HEIC and save as JPG
Use command-line tools like ImageMagick or ffmpeg to convert HEIC to JPG
Change iPhone camera settings to capture photos in Most Compatible format instead of HEIC