OneDrive stores PDFs and previews them in Edge or the browser. For editing, Microsoft's expectation is that you open in Word (which converts and breaks layout) or Acrobat (which costs). Neither is necessary for everyday edits.
The Office trap
OneDrive offers 'Open in Word' for PDFs. Word converts the PDF to DOCX, layout shifts, you edit, save back. Result: a Word document, not a PDF anymore, often with formatting damage. Useful occasionally; not a general PDF edit solution.
Flint edits the PDF as a PDF. Layout preserved.
The flow
Open OneDrive. Right-click the PDF → Download. Open Flint in another tab. Drag in the file. Edit text, sign, merge, etc. Download. Upload back to OneDrive via drag-drop or the Upload button.
No Office subscription needed for any of this.
Versioning
OneDrive keeps version history for files. Upload the edited PDF to the same filename and OneDrive saves it as a new version (with the previous version accessible). Or save under a new name to keep history visually obvious.
FAQ
Can OneDrive's web Office edit PDFs?
Word for the web opens PDFs by converting to Word format. It edits the converted Word file, not the PDF directly. Save back as PDF if needed; layout may have shifted.
Is there a OneDrive PDF editor app?
Microsoft doesn't ship one specifically. Third-party Office add-ins exist but most are paid. Browser-based Flint avoids the add-in dance.
Will Flint work with corporate OneDrive?
Yes — corporate OneDrive is still a OneDrive web interface, and Flint runs in any browser. IT may restrict the download step in some configurations; if so, ask IT or use sanctioned tools.
OneDrive holds, Flint edits. No Office sub needed.