4 Best Open Source Microsoft Office Alternatives
A curated collection of the 4 best open source and self-hosted alternatives to Microsoft Office in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for Microsoft Office in 2026? The top open-source alternative is CryptPad — Open-source collaboration suite offering encrypted document editing, file sharing, and team workspaces with complete privacy protection..
Other highly rated open-source Microsoft Office alternatives include LibreOffice, Collabora Online and ONLYOFFICE Docs.
Open-source collaboration suite offering encrypted document editing, file sharing, and team workspaces with complete privacy protection.
Open-source collaboration suite offering encrypted document editing, file sharing, and team workspaces with complete privacy protection.
Free and private office suite, no forced AI
LibreOffice is a free and open-source office suite created by a global community of contributors. It provides a comprehensive set of tools for word processing, spreadsheets, presentations, databases, vector graphics, and mathematical formulas—all without forced AI integration. - Writer: Powerful word processor for notes, documents, and books - Calc: Advanced spreadsheet tool for data analysis and visualization - Impress: Create engaging multimedia presentations - Draw: Design diagrams, flowcharts, and 3D illustrations - Base: Manage databases with tables, forms, and reports - Math: Visual editor for mathematical formulas - Multi-language support: Available in over 100 languages - Cross-platform: Works on Windows, macOS, and Linux - No forced AI: Completely free from AI dependencies or tracking - Community-driven: Developed and maintained by volunteers worldwide LibreOffice is a desktop application that can be self-hosted by installing the software locally. It does not require cloud services or external dependencies. The source code is available on GitHub under the Mozilla Public License v2.0.
Self-hosted office suite for collaborative document editing
Collabora Online is a powerful, open-source office suite that provides real-time collaborative editing for documents, spreadsheets, and presentations. Built on LibreOffice technology, it offers a familiar interface while ensuring data privacy through self-hosting capabilities. - Real-time collaboration: Multiple users can edit documents simultaneously with changes reflected instantly. - Full office suite: Includes Writer (text documents), Calc (spreadsheets), Impress (presentations), and Draw (graphics). - Self-hosted deployment: Host on your own infrastructure for complete data control and privacy. - Cross-platform compatibility: Works on desktop, web browsers, and mobile devices (iOS/Android). - Enterprise-grade security: Supports encryption, access controls, and compliance with GDPR and other standards. - Integration ecosystem: Seamlessly integrates with platforms like Nextcloud, ownCloud, and other document management systems. - Scalable architecture: Supports large deployments with the Collabora Online Controller for Kubernetes. - Offline editing: Available through Collabora Office desktop applications. Collabora Online is open-source software that can be self-hosted on Linux servers. It supports Docker containers for easy deployment and integrates with various cloud storage solutions. The software is compatible with major Linux distributions and can be deployed in Kubernetes environments for large-scale deployments. Documentation and community support are available for setup and configuration.
Secure online office suite compatible with MS Office
ONLYOFFICE is a secure online office suite designed for document editing, collaboration, and PDF management. Highly compatible with Microsoft Office formats, it offers a range of features for individuals and enterprises. - Document Editing & Collaboration: View, edit, and collaborate on documents, spreadsheets, and presentations in real-time with character- and paragraph-level co-editing modes. - PDF Management: Build and fill PDF forms, edit PDFs, convert documents to PDF, and extract text from scanned PDFs. - AI-Powered Tools: Generate documents, sheets, and slides using AI assistants. Translate, rewrite, check grammar, and extract text from scanned PDFs. Supports integration with local AI models. - Security & Compliance: Open-source code, compliance with international security standards, three levels of encryption (at rest, in transit, end-to-end), secure access, and extra document permissions. - Multi-Platform Integration: Connect ONLYOFFICE Docs to 40+ platforms like Box, Moodle, Nextcloud, and WordPress. Integrate into custom services or use desktop and mobile apps for offline editing. - Collaboration Features: Share documents for viewing, editing, reviewing, or filling forms. Compare and track changes, leave comments, and communicate via built-in chat or Telegram. ONLYOFFICE Docs is open-source and can be self-hosted. It supports integration with various platforms and offers a developer edition for custom integrations. The software is available for Windows, Linux, macOS, iOS, and Android. Learn more about ONLYOFFICE Docs features Learn more about ONLYOFFICE collaboration features Learn more about AI in ONLYOFFICE Learn more about ONLYOFFICE security features
About Microsoft Office
Microsoft 365 is a cloud-based productivity suite that combines familiar Office apps like Word, Excel, and PowerPoint with AI-powered tools such as Copilot to streamline workflows, enhance collaboration, and improve efficiency.
Key Features of Microsoft Office
- Office Applications: Includes Word, Excel, PowerPoint, Outlook, and OneNote for document creation and editing.
- Cloud Storage: 1TB of OneDrive storage per user for secure file access and sharing.
- Collaboration Tools: Real-time co-authoring in Office apps and Microsoft Teams integration for team communication.
- AI Integration: Copilot AI assistant for drafting, editing, and summarizing documents, emails, and spreadsheets.
- Security & Compliance: Built-in security features like data encryption, threat protection, and compliance tools for businesses.
- Cross-Platform Support: Available on Windows, macOS, iOS, Android, and web browsers.
- Business & Enterprise Plans: Tailored plans for individuals, small businesses, and large enterprises with advanced features.
Tech / Self-Hosting
Microsoft 365 is a cloud-based SaaS product and does not support self-hosting. It is managed and hosted by Microsoft's global data centers, ensuring high availability, security, and compliance with regional data protection regulations.