Replacing Google Docs and Sheets with Nextcloud Office: What Works, What Doesn't, and How to Set It Up

The Promise and Reality of Nextcloud Office

Google Docs and Google Sheets changed how teams think about document collaboration. Real-time editing, automatic saving, and seamless sharing — all in a browser — became the baseline expectation. When organizations consider replacing Google Workspace with Nextcloud, the document editing experience is usually the first concern.

Nextcloud does not include a built-in office suite. Instead, it integrates with two mature open-source office platforms: Collabora Online (based on LibreOffice) and OnlyOffice (an independent office suite). Both provide real-time collaborative editing of documents, spreadsheets, and presentations directly within the Nextcloud web interface.

This guide is an honest assessment of what works, what does not, and how to get the best results. We will cover both integration options, their strengths and limitations, and provide practical setup guidance for teams making the switch. For context on how Nextcloud office fits into a broader platform replacement strategy, see our complete guide to replacing Google and Microsoft with Nextcloud.

Collabora Online vs OnlyOffice: Choosing Your Office Backend

Before diving into features, you need to choose which office integration to deploy. This is not a trivial decision — each has distinct advantages.

Collabora Online

Collabora Online is the cloud-deployed version of LibreOffice, developed by Collabora Productivity. It runs as a separate service that Nextcloud communicates with via the WOPI (Web Application Open Platform Interface) protocol. Collabora has been LibreOffice's primary corporate contributor for over a decade, which means it benefits from the full depth of LibreOffice's document rendering engine.

Strengths:

• Best-in-class compatibility with Microsoft Office formats (DOCX, XLSX, PPTX) — the same rendering engine used by LibreOffice Desktop
• Strong support for complex formatting, macros, and advanced spreadsheet features
• Native ODF (Open Document Format) support
• Active development by a dedicated company with enterprise support options
• Lower resource consumption than OnlyOffice for basic editing tasks

Limitations:

• The user interface feels less modern than OnlyOffice — it resembles LibreOffice rather than Microsoft Office
• Some advanced Excel features (complex pivot tables, certain chart types) may not render perfectly
• Mobile editing experience is functional but not as polished as OnlyOffice

OnlyOffice

OnlyOffice is an independent office suite that uses OOXML (Microsoft's Office Open XML) as its native format. Its interface is intentionally designed to feel familiar to Microsoft Office users, with a ribbon-style toolbar and similar layout.

Strengths:

• Modern, Microsoft Office-like interface that reduces the learning curve for teams switching from Microsoft 365
• Excellent OOXML format support — documents round-trip between OnlyOffice and Microsoft Office with minimal formatting loss
• Superior spreadsheet experience for typical business use (charts, conditional formatting, formulas)
• Built-in form builder for creating fillable documents
• Better mobile editing experience

Limitations:

• Higher resource requirements — OnlyOffice Document Server needs more RAM and CPU than Collabora
• ODF format support exists but is not as mature as Collabora's
• The community edition limits simultaneous editors (20 connections); paid plans remove this limit
• Some complex VBA macros and advanced Excel features may not convert

Comparison Table: Collabora vs OnlyOffice

For a detailed setup walkthrough of Collabora Online with Nextcloud, see our Collabora Office setup and configuration guide.

What Works Well: Document Collaboration

Let us be specific about what Nextcloud Office handles well, because the list is longer than skeptics might expect.

Real-Time Collaborative Editing

Both Collabora and OnlyOffice support multiple users editing the same document simultaneously. You see other users' cursors, their changes appear in near real-time, and the system handles conflict resolution automatically. For teams of 2-10 simultaneous editors on a single document — which covers the vast majority of real-world collaboration scenarios — the experience is smooth and reliable.

Comments and track changes work as expected. You can tag users in comments, accept or reject tracked changes, and maintain a revision history. These features are essential for document review workflows, and they work well in both Collabora and OnlyOffice.

Document Compatibility

The most common concern when leaving Google Docs or Microsoft 365 is document compatibility. In practice, both Collabora and OnlyOffice handle standard business documents — letters, reports, proposals, invoices, basic spreadsheets — without issues. Formatting is preserved, and documents can be shared externally in DOCX/XLSX/PPTX format with confidence.

OnlyOffice has a slight edge here because OOXML is its native format. Documents created in Microsoft Office open in OnlyOffice and save back to DOCX without any conversion step. Collabora converts between ODF and OOXML, which can occasionally introduce minor formatting shifts in complex documents.

Spreadsheet Capabilities

For most business spreadsheet tasks — data entry, formulas, charts, pivot tables, conditional formatting — both integrations perform well. Standard functions (SUM, VLOOKUP, IF, COUNTIF, etc.) work identically to Google Sheets and Excel. Chart creation covers all common types: bar, line, pie, scatter, and area charts.

OnlyOffice supports more Excel-specific features natively, including certain chart subtypes and conditional formatting rules that Collabora may render differently. If your team relies heavily on complex spreadsheets, OnlyOffice is the safer choice.

Presentation Editing

Both integrations support creating and editing presentations. Slide layouts, transitions, animations, speaker notes, and embedded media all work. The editing experience is simpler than Google Slides or PowerPoint Online, but it covers the essentials. For teams that create basic presentations for internal meetings, either integration is sufficient.

What Doesn't Work (or Doesn't Work Well)

Honesty about limitations is more useful than overselling capabilities. Here is where Nextcloud Office falls short compared to Google Docs and Microsoft 365.

Real-Time Collaboration at Scale

Google Docs can handle 100+ simultaneous editors on a single document (Google's published limit is 200 viewers and 100 editors). Neither Collabora nor OnlyOffice performs well with more than 15-20 simultaneous editors on a single document. Lag increases, cursor tracking becomes unreliable, and conflict resolution occasionally produces unexpected results.

For most teams, this is not a real limitation — few documents actually have more than 10 people editing simultaneously. But if you run large collaborative workshops or all-hands documents with many contributors, this is a genuine gap.

Google Docs-Specific Features

Several Google Docs features have no equivalent in Nextcloud Office:

• Smart chips: Google Docs' inline chips for dates, people, files, and smart canvas elements
• Explore sidebar: AI-powered research and citation tools
• Voice typing: Built-in speech-to-text
• Google Forms integration: Embedding form responses directly in Sheets
• Apps Script: Google's JavaScript-based automation platform for extending Docs/Sheets functionality

If your team relies heavily on any of these features, you will need to find alternative workflows or accept their absence.

Advanced Excel Features

Power users who rely on advanced Excel features may encounter limitations:

• Power Query / Power Pivot: Not supported in either Collabora or OnlyOffice
• Complex VBA macros: Limited support — simple macros may work, complex ones will not
• Dynamic arrays (SORT, FILTER, UNIQUE functions): Partial support in OnlyOffice, limited in Collabora
• 3D references across sheets: Inconsistent behavior
• Advanced data validation with complex formulas: May not render correctly

The practical impact depends on your team's usage patterns. If your heaviest spreadsheet users rely on Power Query or complex VBA, they may need to keep a local copy of LibreOffice or Microsoft Excel for those specific tasks while using Nextcloud Office for collaborative work.

Offline Editing

Google Docs supports offline editing through Chrome. Microsoft 365 desktop apps work fully offline. Nextcloud Office (both Collabora and OnlyOffice) is server-based — it requires a network connection to the Nextcloud server. There is no offline editing mode for the web-based office suite.

The workaround is to use the Nextcloud desktop sync client to keep files available locally, and edit them with a local office application (LibreOffice or Microsoft Office) when offline. Changes sync when the connection is restored.

How to Set It Up: Practical Deployment Guide

Setting up Nextcloud Office requires deploying the office backend (Collabora or OnlyOffice) as a separate service alongside your Nextcloud instance. Here is the recommended approach for a production deployment.

Option 1: Collabora Online via Docker

The simplest deployment method uses Docker. On your MassiveGRID Nextcloud server, run the Collabora Online container alongside Nextcloud:

1. Pull and run the Collabora container: Deploy the CODE (Collabora Online Development Edition) container with your Nextcloud domain whitelisted. Set the server_name environment variable to your Collabora subdomain and the aliasgroup1 to your Nextcloud domain.
2. Configure a reverse proxy: Set up Nginx or Apache to proxy requests to the Collabora container on its designated port. WebSocket support must be enabled for real-time collaboration.
3. Install the Nextcloud Office app: In Nextcloud Admin settings, install the "Nextcloud Office" app (formerly Collabora Online). Enter your Collabora server URL.
4. Test with a document: Open any DOCX, XLSX, or ODT file in Nextcloud. It should open in the Collabora editor within the Nextcloud interface.

Option 2: OnlyOffice via Docker

OnlyOffice Document Server also deploys cleanly via Docker:

1. Pull and run OnlyOffice Document Server: Deploy the container with a JWT secret for secure communication between Nextcloud and OnlyOffice.
2. Configure the reverse proxy: Proxy requests to the OnlyOffice container. Like Collabora, WebSocket support is required.
3. Install the OnlyOffice connector app: In Nextcloud Apps, install "ONLYOFFICE." Enter the Document Server URL and the JWT secret.
4. Configure file type associations: In the OnlyOffice admin settings, select which file types should open in OnlyOffice versus Nextcloud's built-in text editor.

Resource Requirements

For best performance, run the office backend on the same server as Nextcloud or on a dedicated server in the same data center. MassiveGRID's cloud servers with 8 GB or more RAM comfortably run both Nextcloud and either office integration for teams up to 50 users.

Performance Tuning for Production Use

Out-of-the-box performance is adequate for testing, but production deployments benefit from tuning.

For Collabora Online:

• Increase the maximum number of documents and connections in the Collabora configuration (loolwsd.xml)
• Enable the per_document memory limits to prevent a single complex document from consuming all resources
• Set idle document timeout to free resources from abandoned editing sessions
• Configure font packages — install Microsoft core fonts (via the ttf-mscorefonts-installer package) for better Office format rendering

For OnlyOffice:

• Configure the maximum number of simultaneous connections in the OnlyOffice configuration
• Enable caching for frequently accessed documents
• Set up health monitoring — OnlyOffice Document Server can become unresponsive under heavy load without warning
• Consider running multiple Document Server instances behind a load balancer for teams larger than 30 simultaneous editors

Migration Strategy: Moving from Google Docs

If your team currently uses Google Docs, here is a practical migration approach:

1. Export from Google: Use Google Takeout to export all Drive files. Docs, Sheets, and Slides will be converted to their Microsoft Office equivalents (DOCX, XLSX, PPTX). Alternatively, use the Nextcloud Google integration app to import directly.
2. Upload to Nextcloud: Upload the exported files to your Nextcloud instance. The desktop sync client can handle bulk uploads efficiently.
3. Verify critical documents: Open your team's most complex documents in Nextcloud Office and verify formatting. Fix any issues before going live.
4. Set file type defaults: Configure Nextcloud to open office file types in your chosen editor (Collabora or OnlyOffice) by default.
5. Train your team: The editing interface is similar enough that most users adapt quickly. Focus training on collaboration features (sharing, commenting, version history) rather than basic editing.
6. Run parallel for 2-4 weeks: Keep Google Workspace active during the transition. Set a firm cutover date and communicate it clearly.

Migration Strategy: Moving from Microsoft 365

Migrating from Microsoft 365 to Nextcloud Office requires similar steps with a few differences. For a comprehensive comparison of the infrastructure and cost implications, see our Nextcloud vs Microsoft 365 infrastructure and cost comparison.

1. Export from OneDrive/SharePoint: Use the OneDrive sync client to download all files locally, or use Nextcloud's external storage feature to connect directly to SharePoint/OneDrive for migration.
2. Choose OnlyOffice for smoother transition: If your team is deeply embedded in Microsoft Office workflows, OnlyOffice's ribbon interface and native OOXML support will ease the transition.
3. Address macro dependencies: Audit any documents with VBA macros. Simple macros may work; complex ones will need to be rewritten or their functionality replaced with alternative workflows.
4. Plan for Outlook migration separately: Email is a separate consideration. Nextcloud Mail can replace basic email workflows, but it is not a full Exchange replacement. Consider keeping your email provider separate or migrating to a dedicated mail solution.

Real-World Scenarios: Who Should (and Shouldn't) Switch

Good Fit for Nextcloud Office

• Teams of 5-100 people who primarily create standard business documents (reports, proposals, letters, basic spreadsheets)
• Organizations with data sovereignty requirements that prohibit sending documents to US cloud providers
• Development teams that already use Nextcloud for file storage and want integrated document editing
• Budget-conscious organizations that want to eliminate per-user office suite licensing
• Teams that need collaborative editing but do not need 50+ simultaneous editors on a single document

Not a Good Fit

• Organizations whose core workflows depend on advanced Excel features (Power Query, complex VBA, Power Pivot)
• Teams that routinely have 20+ people editing a single document simultaneously
• Organizations that need offline document editing without any desktop application installation
• Enterprises deeply integrated with Google Apps Script or Microsoft Power Platform automations

The Bottom Line

Nextcloud Office is a capable, production-ready replacement for Google Docs and Sheets for the majority of team collaboration needs. It handles standard document editing, real-time collaboration, commenting, track changes, and basic spreadsheet work without significant compromises.

Where it falls short — advanced Excel features, massive simultaneous editor counts, and offline web editing — these are genuine limitations that you should evaluate against your team's actual usage patterns. For most organizations, these limitations affect a small minority of their document workflows and can be addressed with targeted workarounds.

The combination of Nextcloud for file storage and sharing with either Collabora or OnlyOffice for document editing creates a self-hosted productivity platform that competes directly with Google Workspace and Microsoft 365. The trade-off is clear: you give up some polish and edge-case features in exchange for complete data ownership, no per-user licensing, and the ability to run your entire productivity stack on infrastructure you control.

For teams that have already compared Nextcloud against Google Drive and OneDrive for file storage, adding office collaboration is the natural next step in building a complete self-hosted workspace.