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How to create a back of book index
Review your book, copy all terms and phrases you want to see in the book index, and save them in a text file.
Choose a program to write and design your book index.
You can use microsoft word or adobe indesign, but locating your index terms will take a long time.
There is a tool called pdf index generator that will locate your words faster and write the final index to your pdf book. Open pdf index generator and define your list of terms that you have collected from your book.