Once you open your newly generated IDML file back in InDesign or another layout application, you may notice slight shifts. Here is how to address them:
For those who need to convert files regularly without a subscription, software like is the industry standard. It works as a stand-alone application that opens any INDD file and exports it to IDML, PDF, or even directly into QuarkXPress and Affinity Publisher. This is the closest you can get to a "full" conversion without Adobe software.
: Aimed at enterprise and professional users, Typefi offers automated conversion services that utilize InDesign Server instances for high-accuracy results. Native InDesign Method (Free if you have the software)
Clean user interface; secure data handling (files deleted after conversion); offers an API for batch conversions.