A file with the INDD file extension is an InDesign Document file most commonly created and used by Adobe InDesign. The file stores page content, formatting information, files, and more.
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InDesign uses these files when producing newspapers, books, brochures, and other professional layouts.
Some InDesign document files have file extensions of only three letters, such as .IND, but they still have the same format.
Adobe InDesign is the primary software used to work with INDD files. However, you can also check out Adobe InCopy and QuarkXPress (with the ID2Q plugin).
