Two tools for two jobs. LibreOffice for desktop editing — free, powerful, reads every Office format. OnlyOffice for browser-based collaboration — the best open-source alternative to Google Docs. Neither requires a subscription.
Download LibreOffice from libreoffice.org. Available for Windows, Mac, and Linux. The installer includes Writer (documents), Calc (spreadsheets), Impress (presentations), and Draw. LibreOffice opens .docx, .xlsx, and .pptx files natively — you do not need to convert anything. It saves in both Microsoft formats and the open ODF standard.
LibreOffice Start Center showing recent documents and options for Writer, Calc, and Impress. Open an existing .docx file — it should render correctly.
Open your most complex documents in LibreOffice — documents with tables, charts, images, and custom formatting. Most files render correctly. Occasional differences appear with advanced Excel macros, PowerPoint animations, or complex Word formatting. For these edge cases, OnlyOffice has better Microsoft format fidelity. Test a few files from each category to understand where the limits are for your specific workflow.
Documents, spreadsheets, and presentations open with formatting intact. Note any files that look different — these are the ones to test in OnlyOffice.
If you use Google Docs, go to takeout.google.com. Click "Deselect all", then check only "Drive". Choose "Send download link via email" and ".zip" format. Google will convert your Google Docs to .docx, Sheets to .xlsx, and Slides to .pptx. Download and unzip the export. These files open directly in LibreOffice. If you use Microsoft 365, your files are already in .docx/.xlsx/.pptx format — just download them from OneDrive.
A folder of .docx, .xlsx, and .pptx files. Open several in LibreOffice to confirm formatting is preserved.
If you need real-time collaboration (multiple people editing the same document), install OnlyOffice Desktop Editors from onlyoffice.com — free for personal use. OnlyOffice has the best Microsoft Office format compatibility of any open-source editor. It renders .docx files almost identically to Word. For team use, OnlyOffice also offers a cloud workspace or self-hosted server with real-time co-editing, comments, and version history — the closest open-source equivalent to Google Docs.
OnlyOffice opens and displays documents with formatting matching Microsoft Office. If using the cloud workspace, you can share a document link and edit simultaneously.
Set LibreOffice as your default application for .docx, .xlsx, and .pptx files — right-click a file, choose "Open with", select LibreOffice, and check "Always use this app". Use LibreOffice for daily editing. Use OnlyOffice when you need to collaborate in real-time or when a document has complex Microsoft-specific formatting. Germany's Schleswig-Holstein state migrated 44,000 government employees to this exact LibreOffice + OnlyOffice stack — it works at scale.
Double-clicking a .docx file opens LibreOffice. Your workflow is: LibreOffice for solo editing, OnlyOffice for collaboration, no subscription required for either.