The Wildbot Sales Map allows you to upload CSV files of your orders from Etsy. A marker is placed everywhere you've shipped an order.
For performance reasons it only generates one marker per state/province in the US and Canada and only one marker per country for everywhere else.
In your Esty keywords, you have 13 slots, and each slot has enough room for 20 characters. That's 260 character's worth of keywords, including spaces. If you are very careful, you can pack around 35 different keywords into that space.
What this tool does is looks at your list of keywords, compares their lengths, and then figures out how to tetris them into the 13 slots as efficiently as possible, making sure as may of those 260 characters are filled up with words.