Image 2ico n
1 Here you drop images and items to it from Finder, in order to make edits and apply your custom icons.
2 You need to make major edits to images in a bespoke app. But, Image2icon does have some basic positioning tools.
3 For free, you can add your custom image and use the editing tools. But pay the upgrade and you gain access to over 20 templates, ranging from folders to cases for oldschool media.
4 Using the Export button, you can save your work in several formats (more if you pay). For PNG or JPEG you could just load an exported icon into Preview and re-export from there.