If you are a Creative Cloud subscriber, Adobe offers a "Simple Saveback" service.
: Choose a destination and click Save . This new .idml file can now be opened by older versions of InDesign, which will then convert it into a new, "Untitled" .indd document. Specialized Conversions for Legacy Versions how to convert indesign file to older version
: Font engines change across versions. Inspect text boxes to ensure text has not shifted or hidden behind other elements. If you are a Creative Cloud subscriber, Adobe
If you are sending a file to another designer using an older version, the command is often safer as it includes all necessary assets. Go to File > Package . Specialized Conversions for Legacy Versions : Font engines
This is the standard approach if you already have the file open in the newer version. Open your document in the newer version of InDesign.
IDML is a complete, uncompressed XML-based project file. It contains every piece of text, every frame, every swatch, and every style. It is the "source code" of your layout.
If you need to troubleshoot a or are dealing with a corrupted file during conversion, please share the details. I can provide targeted troubleshooting steps for your exact setup! Share public link