If like me to have an Iphone and need to convert photos from the default file format of HEIC to JPG (or any other format) then this awesome tip will be great for you.
Adobe Lightroom allows you to batch convert the files, whilst performing plenty of other tasks too.
Now Adobe Lightroom is a complex paid for app, but if you happen to have the Adobe Creative Cloud or similar product you may have missed this one. I just use it to batch convert my iphone photos ready for posting onto various blogs etc.
Find it here – https://lightroom.adobe.com/