Many translation tools, plugin tools, and layout applications require IDML.
INDD files, while widely used, have some limitations:
: Never delete your original .indd file. Always convert a copy.
Ensure your .indd file is not corrupted and is fully saved on your local drive.
Do you need to convert a specific version of an InDesign file, or are you looking for a free way to open it?
: IDML is an XML-based format that can be read by competing software like Affinity Publisher or QuarkXPress. Best Free Online INDD to IDML Converters
FConvert is a free, web-based file conversion platform that handles desktop publishing formats.