There are no true, standalone "direct" online converters for .indd to .idml that work without some form of Adobe technology in the background. Because .indd is a proprietary, closed format, most "converters" you find online are actually services that require you to upload the file to a server running InDesign. Top Online Options
Fifteen minutes remained. Silas refreshed the page. Nothing. The spinner mocked him.
The window opened.
Briefly explain:
If you need to convert small to medium-sized InDesign files to IDML format on a regular basis, the Indd to IDML online converter is a good choice. However, if you work with large or complex files, you may want to consider alternative solutions.