ELAN offers the possibility to export multiple annotation files as one file. To do so click on File > Export Multiple Files As... and one of the options.
Toolbox File(UTF-8) (see the section called “Toolbox file(UTF-8)”)
FLEx File... (see the section called “FLEx file”)
Praat TextGrid... (see the section called “ Praat TextGrid”)
Tab-delimited Text... (see the section called “Tab-delimited Text”)
List of Annotations... (see the section called “List of annotations”)
List of Words... (see the section called “List of Words”)
Selected Tiers as EAF... ( see the section called “Export tiers as EAF”)
Annotation Overlaps Information... ( see the section called “Annotation Overlaps Information”)
Theme Data Files... ( see the section called “Theme Data Files”)
Annotated Part Overview... (see )