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Anton Pomozovleft a comment
I constantly need to upload images to some services from my iPhone. However, they still do not recognize HEIC format. I tried many times to find a built-in option to export images as JPEGs, but no luck. Finally, I've developed the most simple way to convert images via Share Sheet extension. A couple of conversion settings available to tune the expected result. That's it.

Simplest JPEG converterThe simplest way to provide a JPEG when it is required
The simplest way to convert any iPhone photo to JPEG
If you’ve ever needed to send someone a JPEG (because it's the most compatible image format)… you probably discovered that the Photos app doesn’t make it easy.

Simplest JPEG converterThe simplest way to provide a JPEG when it is required
