JPG, but you can also convert them yourself. Apple’s systems can automatically convert shared HEIC images to. The format stores higher-quality images within smaller file sizes, compared with the older.
The High Efficiency Image File container format, indicated by a HEIC or HEIF file extension, was adopted by Apple last year with the release of its iOS 11 and macOS High Sierra systems. I couldn’t open them in Photoshop Elements, and our site won’t accept HEIC files for uploading. A colleague sent me pictures of an event from an iPhone, and they were in HEIC format. I manage content on our school’s website, including pictures.
