Removes from DOCX, XLSX and PPTX the author and last editor names, the company, creation and editing dates, the revision number, the time spent on the document, classification labels in custom properties and names in comments and tracked changes. Text, tables and formatting stay untouched.
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DOCX · XLSX · PPTX
An Office document is a ZIP archive of XML parts. Properties live in dedicated service parts, the content lives in others. Only the service parts are touched.
| What | Where it lives | Why it matters |
|---|---|---|
| Author and last editor | docProps/core.xml | Names the person who worked on the file |
| Creation and editing dates | docProps/core.xml | Show when and how long the document was prepared |
| Revision number | docProps/core.xml | How many times the document was rewritten |
| Company and manager | docProps/app.xml | Reveals the organisation even when the text does not |
| Application, version, template | docProps/app.xml | Office version and the corporate template |
| Editing time | docProps/app.xml | A minute counter: ten minutes of work is visible as such |
| Heading and sheet structure | docProps/app.xml | Section titles are visible without opening the file |
| Classification labels | docProps/custom.xml | “Internal use only”, cost centre, project number |
| Names in comments and revisions | document content | Who proposed what and when |
| Editing session identifiers | word/settings.xml | Link different documents by the same author |
| First page thumbnail | docProps/thumbnail | Shows the content without opening the file |
Yes. Content parts — word/document.xml, Excel sheets, slides — are copied as is. Only the service parts with properties change. Formatting, formulas, images, fonts and internal relationships are preserved: after cleaning every reference in _rels is checked to point at an existing part.
The revisions and comments themselves stay — that is content, and deleting it silently would be wrong. Only the authors are anonymised: the name becomes “Author”, initials and timestamps are set to neutral values. Word itself does exactly this when you enable removal of personal information on save. If you do not want revisions in the file at all, accept or reject them in Word before cleaning.
Service parts and the first page thumbnail are removed and everything else is compressed again. On a typical document the saving runs from a few per cent to a third of the size — the discarded thumbnail accounts for most of it.
The old .doc, .xls and .ppt formats are built completely differently — they are OLE binary containers, not archives, and are not supported here. Re-save the file in a modern format. ODT and PDF are not supported yet either: ODT is structured much like DOCX and may come later, PDF needs a separate parser.