How do I repaint my front door?

My front door is a double door with glass panels taking up half of the top. It is painted a dark brown colour and is very chipped. There is a noticeable different in thickness between paint still on the door and where I can just see wood. Do I have to completely strip all the old paint down or can I just sand it. I... show more My front door is a double door with glass panels taking up half of the top. It is painted a dark brown colour and is very chipped. There is a noticeable different in thickness between paint still on the door and where I can just see wood. Do I have to completely strip all the old paint down or can I just sand it. I feel like if I just paint over it you will be able to see where the paint had chipped before. Help please!! I also have a primer
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