Vbadiff ((install)) -

The developer exports all modules as text files using the VBA IDE’s “Export File” feature, then runs a standard diff tool (WinMerge, Beyond Compare, or git diff ) on the exported .bas files. While reliable, this process is tedious and error-prone for large projects.

Several open-source and commercial tools automate extraction. For example, vbacmp (VBA Compare) or oletools (specifically olevba ) can extract macro source from Office files and produce a unified diff. These tools parse the OLE streams, decompress the VBA directory, and output plain-text representations of each module. vbadiff