A handy side use for this is compressing PDFs.
For some reason, printing 1 page of an Excel or Word document to a PDF often gets up to around 4MB in size. Passing it through this compresses it quite well.
Just ran a quick test:
- 1-page Excel PDF export: 3.7MB
- Processing with Dangerzone (OCR enabled): 131KB
I wonder if the Excel export is retaining a lot of document structure in the event that it's imported back into Excel again at a later point.