Sometimes indexers need to produce an index that is simply a version of a previous index. It may entail only minor changes to the original, such as deletion or replacement of a few pages or chapters, updating edited entries or splitting it into multiple indexes to match subsections. If for any reason, an indexer needs to get an index back into the indexing software, typing the entries one by one is time-prohibitive. It is much more cost-effective to convert it. The goal of this article is to provide an overview of the conversion process, along with a few ‘secrets’ for converting the index back into your indexing software.