Not Recommended at All
The app does what it claims to do, but it has a fundamental flaw that makes it totally unsatisfactory: after the corners on an image are rounded, the resulting saved image is of much lower quality than the original. For example, a 70 kb image was reduced to 5 kb. This flaw makes the program absolutely unuseable in my opinion.
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Response from developer
Images have different formats when saved and the size may different, so the reduced size does not mean low quality!