.IDML File

File extension idml is best know to be associated with Adobe InDesign software, part of Adobe Creative Cloud and previously Creative Suite.

The InDesign Markup Language was introduced with InDesign CS4 and InDesign still supports backward compatibility with .inx files.

IDML format was designed to replace the INX format, which is more difficult to create and edit. IDML files provide an interchangeable format for Adobe is InDesign documents, as well as a way for third-party tools to modify and assemble InDesign documents.

In some cases you may want to save an InDesign in interchange markup format. It’s especially useful to save in this format when you open documents from other apps.

The idml file is a renamed zip archive, which contains various XML files:

• Resources
• Spreads
• Stories
• XML
• MasterSpreads
• META-INF

Files with idml extension can be usually found as InDesign documents saved in special InDesign Markup language.

How to open:

Use Adobe InDesign to open and work with the *.idml files.

How to convert:

Your best option for conversion or export of *.idml file would be to use InDesign because hardly any 3rd party apps support IDML format.