You took the photos on your iPhone: a product shot, a signed form, an ID card for a college application, a picture of a damaged parcel for a refund claim. Then you try to upload it and the website says "file type not supported". Or you email it to someone on Windows and they reply that it will not open.

The problem is usually the file format. Recent iPhones save photos as HEIC (sometimes shown as HEIF) by default. It is a perfectly good format, but plenty of upload forms, government and college portals, marketplaces and older Windows apps still expect JPG . This guide shows how to convert HEIC to JPG quickly, which settings to pick, and the mistakes that cause rejected uploads. It is written for small business owners, students and sellers who just need the photo to work.

What HEIC is, in one paragraph

HEIC is the file type iPhones and iPads use when the camera is set to "High Efficiency". It keeps photos small on the phone while looking good.…