Microsoft Office Alternatives
The 90/10 rule — and when alternatives are genuinely enough
What it is
Microsoft Office (now Microsoft 365) is the most widely used productivity software suite in the world. Word, Excel, and PowerPoint are the de facto standard formats for business documents. The .docx, .xlsx, and .pptx formats are everywhere. Leaving Microsoft Office means choosing an alternative that can open these formats, even if it can't perfectly replicate every feature.
What you lose
- Native compatibility with complex Office documents (the 10%)
- Microsoft's AI features (Copilot) if you use them
- OneDrive integration (replaceable with other cloud storage)
- Real-time co-editing with Office users (Google Docs has this; LibreOffice less so)
Honest assessment
For personal use — writing documents, tracking household finances, making occasional presentations — LibreOffice is genuinely excellent and completely free. For professional use where you exchange documents with organizations that expect pixel-perfect Office formatting, the compatibility gaps are real and will cause friction. The honest question is which category your actual use falls into.
Alternatives
- LibreOffice Free, open source — The gold standard free Office alternative. Writer (Word), Calc (Excel), Impress (PowerPoint), Base (Access), Draw, Math. Opens and saves Microsoft formats. Runs locally, no subscription, no cloud required. Works on Windows, Mac, Linux. Best for users who want desktop Office without the subscription and data collection.
- OnlyOffice Free desktop version; paid for server — Higher Microsoft format fidelity than LibreOffice for complex documents. Slightly closer to Office's UI if you want familiarity. Good option for users with complex documents who need better compatibility than LibreOffice provides.
- CryptPad Free tier; from €5/month for more storage — End-to-end encrypted, open source, runs in browser. Document, spreadsheet, and presentation editing with privacy. No account required for basic use. Ideal for sensitive documents you don't want on Microsoft's or Google's servers.
- Google Docs / Sheets / Slides Free — Excellent real-time collaboration. Opens and exports Microsoft formats. Widely used. Trades Microsoft's data collection for Google's — not a privacy win, but a vendor independence win. Files stored in Google Drive.
- Proton Docs — End-to-end encrypted document editing from Proton. Newer and still developing. Good if you're already in the Proton ecosystem.
Migration steps
- Install LibreOffice on your computer (free, no account needed)
- Open a sample of your most important existing documents to verify they look correct
- For any that don't look right, determine if they use complex features or are just basic documents with formatting issues
- Set LibreOffice as the default app for .docx, .xlsx, .pptx files
- Cancel Microsoft 365 subscription after confirming LibreOffice handles your workflow
- Move documents from OneDrive to Proton Drive, Nextcloud, or local storage
- For documents that need pixel-perfect compatibility, save as PDF when sharing externally