Why iPhone photos need converting
iPhones save photos in HEIC by default — and on some camera apps, plain HEIF — to halve the storage footprint. The trade-off is that Windows, Android, older Mac software, online photo printers, web upload forms, and email previewers often refuse the format with a generic "unsupported" error. Converting to JPG produces a universally-openable copy without losing visible quality.
How to convert iPhone photos to JPG in Safari
Open Converter.Plus in Safari on your iPhone, tap the drop zone, and pick photos from your camera roll using the standard iOS Photos picker. The converter decodes HEIC and HEIF in your browser via the WebAssembly HEIF decoder, re-encodes to JPG at 92% quality by default, and saves the converted files to your Files app where you can attach them to email or upload them anywhere.
On a Mac or Windows PC?
AirDrop the photos to your Mac (or transfer via cable / iCloud Photos to Windows) and drop them onto converter.plus/heic-to-jpg in any browser. The same in-browser HEIF decoder runs on every desktop platform — no installation, no Microsoft Store extension, no Adobe subscription needed.