Adobe InDesign Library
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What is an INDL file?
An INDL file is an object library created by InDesign, an application used to create professional page layouts. It may contain graphics, text, and pages, as well as ruler guides, grids, drawn shapes, and grouped images. INDL files allow users to organize and reuse common page elements together.
You can create an INDL file by highlighting one or more objects and then selecting File → New → Library. You can add or remove individual objects to an open object library using the Library panel.
InDesign also supports Creative Cloud (CC) INDL libraries. These libraries allow you to share content with other InDesign users.
How to open an INDL file
You can open INDL files with Adobe InDesign in Windows and macOS by selecting File → Open.... You can also double-click an INDL file if it is associated with InDesign. Opened libraries appear on the Object Library panel in the InDesign user interface.
NOTE: When opening an INDL file from an older software version, InDesign automatically converts the object library to the most recent format.