IDML (InDesign Markup Language) is Adobe's own XML-based interchange format for InDesign documents. Unlike native INDD files, which are binary and version-specific, IDML files can be opened in any InDesign version from CS4 onward. This makes IDML the professional standard for translation agencies working with InDesign: it eliminates version conflicts and allows translation memory tools to extract text segments for consistent terminology and recycling of previously translated content.
BeTranslated accepts both INDD and IDML source files. For INDD files, we request that clients export to IDML first (File > Export > InDesign Markup) to ensure compatibility. For ongoing clients with large publication volumes, using IDML consistently enables significant cost savings through translation memory leverage on repeated strings.