Choosing an online office tool often comes down to balancing three parameters: the functional scope of the suite, the level of real-time collaboration, and the location of data hosting. Online office suites have multiplied in recent years, but their functional gaps remain poorly documented. This article compares the main options based on concrete criteria to help you identify the one that suits your needs.
Format compatibility and co-editing: what really separates online office suites
The promise of an online office suite can be summed up in two words: open any file, work on it collaboratively. In practice, the differences between solutions are clear.
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Microsoft 365 remains the benchmark for native compatibility with .docx, .xlsx, and .pptx formats, which avoids layout issues when exchanging with partners. Google Workspace uses its own formats (Google Docs, Sheets, Slides) but exports to Microsoft formats with sometimes approximate results on complex layouts, particularly nested tables in Word documents.
On the alternative side, ONLYOFFICE and Collabora Office have reached a sufficient level of maturity to replace Word, Excel, and PowerPoint in common office use, including co-editing and real-time comments. The results can be evaluated by consulting the Programmi Web online office site, which lists the features of these different solutions.
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| Suite | Native Formats | Real-time Co-editing | Possible Hosting in Europe |
|---|---|---|---|
| Microsoft 365 | .docx, .xlsx, .pptx | Yes | Yes (EU datacenters) |
| Google Workspace | Google formats, MS Office export | Yes | Partial (regional options) |
| ONLYOFFICE | .docx, .xlsx, .pptx (native) | Yes | Yes (self-hosting or EU cloud) |
| Collabora Office | ODF, MS Office formats | Yes | Yes (self-hosting) |
| LibreOffice (online via Collabora) | ODF, MS Office formats | Yes (via Collabora) | Yes |
The table highlights a often overlooked point: all suites now offer real-time co-editing. The differentiating criterion has shifted towards the fidelity of rendering Microsoft documents and the location of servers.
Data sovereignty and GDPR compliance: an underestimated selection criterion
The question of where office files are stored does not only concern large companies. Any organization processing personal data under the GDPR must be able to justify where its information is hosted.
Microsoft 365 has offered datacenters located in the European Union for a few years now, but the parent company remains subject to U.S. law (Cloud Act). Google Workspace offers regional storage options, without total legal guarantees regarding extraterritorial access requests.
European alternatives like ONLYOFFICE or Collabora Office position themselves in this area. Their architecture allows for complete self-hosting: the organization retains physical control of its servers. For a small business or an association, this option requires technical skills, but European hosts offer pre-configured instances.
- ONLYOFFICE can be installed on a private server or via a European cloud provider, ensuring that files do not leave EU territory.
- Collabora Office functions as an online layer added to Nextcloud or ownCloud, two self-hosted storage platforms.
- LibreOffice, in its local office version, does not send any data to a third-party server, making it the simplest solution for non-collaborative uses.
The choice between total sovereignty and functional comfort depends on the volume of real-time collaboration. A team that primarily exchanges finalized files may be satisfied with a local suite. A team that co-writes daily needs a cloud solution, and the location of the server then becomes the parameter to check first.
Multiplication of software subscriptions: the hidden cost of productivity
A team of about twenty people often finds itself with between 6 and 12 active software subscriptions: notes, task management, videoconferencing, storage, electronic signatures. Each additional tool generates a context switch that fragments attention.
The trend observed in 2024-2025 is towards consolidation. Rather than stacking specialized applications, organizations are looking for integrated suites that cover the maximum number of needs. Google Workspace combines email, spreadsheets, word processing, videoconferencing, and storage in a single subscription. Microsoft 365 adds task management (Planner) and team communication (Teams).
In contrast, sovereign suites like ONLYOFFICE or Collabora Office only cover the strictly office part. You need to add a videoconferencing tool (Jitsi, BigBlueButton) and a separate task manager, which brings us back to the initial problem of fragmentation.
Balancing integration and independence
The real calculation does not only concern the price of the monthly subscription. You must also factor in the time lost switching between applications, the cost of maintaining user accounts on each platform, and the risk of document dispersion across multiple storage spaces.
Reducing the number of tools to three or four per team results in a measurable gain in focus and file management. The online office suite, because it covers word processing, spreadsheets, and presentations, serves as the logical foundation around which to organize other components.
Integrated generative AI in office suites: a new comparison parameter
Generative AI is no longer positioned as a separate tool. It is directly integrated into office suites: assisted writing, summarizing long documents, automatic formatting of tables. Microsoft has deployed Copilot in Word, Excel, and PowerPoint. Google offers Gemini in Docs and Sheets.
For European alternatives, AI integration remains more limited. ONLYOFFICE has added connectors to third-party AI models, but the user must configure the connection themselves, which requires a higher technical familiarity.
This gap creates a new selection criterion. If your daily use involves summarizing reports or generating spreadsheet formulas, Microsoft and Google suites offer direct time savings. If the priority remains data control, self-hosted suites retain their advantage, at the cost of more restricted access to AI functions.
Choosing an online office suite is no longer just about comparing word processing features. The determining parameter depends on your context: GDPR compliance for organizations processing sensitive data, all-in-one integration to reduce the number of subscriptions, or access to generative AI to automate writing tasks.
Identifying your main constraint before comparing prices remains the most reliable method to avoid switching suites in six months.