Crossword Creator generates a crossword based on a list of words provided by a user. Once the crossword is generated, users can upload an image from their computer to be used as the crossword's background, and the crossword can also be manually edited. Users can also elect to have additional English words automatically added to the crossword, sourced from Datamuse API.

Crossword Creator uses the JSZip library to create and download a zip file. This zip file download contains the blank crossword puzzle, the solved crossword puzzle, and a text file containing the words in the puzzle.