Since iOS 11, iPhones have saved pictures in HEIC file format by default setting. HEIC — Apple's HEIC format — is highly efficient: it generates pictures with about half the storage of comparable JPEGs while keeping great image quality.
However there is a significant catch. HEIC is an Apple-specific file type which is not broadly compatible outside the Apple devices. PC users, Android phones and most web platforms cannot display HEIC photos with no additional software.
Transforming HEIC to JPG is the necessary step making iPhone pictures universally shareable. Frequent cases needing conversion are sending iPhone photos to non-Apple website users, adding images to social media without support for HEIC.
Mac users enjoy the simplest method. Just open the HEIC image in Preview, go to File, then Export and choose JPEG as the format.
On Windows, online conversion tools process HEIC to JPG conversion with no software installation. Add the HEIC file and save the finished JPG.
Try alljpgconverters.com for a totally free web-based HEIC to JPG tool requiring no software necessary.