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Once you have decided to self-host an open-source office suite, the question narrows fast to three engines: OnlyOffice, Collabora Online, and LibreOffice. They get mentioned in the same breath, but they are not interchangeable. They come from different lineages, they make different trade-offs on real-time collaboration and format fidelity, and they are very different amounts of work to run. Picking the wrong one means either fighting your infrastructure or disappointing your users.
This comparison is for the IT operator who has to make that call. We will sort out what each engine is actually for, how they differ on the axes that matter, and which one fits which kind of deployment. As usual, there is no single winner, only the right engine for your constraints.
Short verdict:
- Collabora Online is the easiest path to self-hosted, real-time, European-built document editing, and the safest pick for most teams.
- OnlyOffice wins on Microsoft-format fidelity and slick web editing, at the cost of a heavier stack and the provenance debate.
- LibreOffice is the desktop and ODF gold standard, but it is not, by itself, a real-time browser-collaboration engine.
Three engines, three different jobs
The first mistake people make is treating these as three versions of the same thing. They are not.
LibreOffice is the mature, desktop, open-document suite maintained by The Document Foundation, a German non-profit. It is what you install on a workstation to open and edit files offline, and it is the ODF reference. It is not, on its own, a server that lets ten people edit one document in a browser at once. A long-running effort to build LibreOffice Online existed and was officially restarted in early 2026, but the desktop suite is the heart of the project. Source: The Document Foundation.
Collabora Online is the server-side, collaborative answer built on the LibreOffice core. The Collabora team, based in the UK, takes the LibreOffice engine and turns it into a service that renders and co-edits documents in the browser. If you want the LibreOffice/ODF heritage with real-time editing and easy self-hosting, Collabora is how you get it.
OnlyOffice is a different lineage entirely: its own HTML5/JavaScript engine, built around the Microsoft Office Open XML formats from the start, delivered as a self-hostable document server. It is the one that feels most like the commercial web suites in daily document work.
So the real question is not “which is best” but “which job am I hiring it for.”
Real-time collaboration
For most teams self-hosting in 2026, collaboration is the deciding axis, because the whole point is to stop emailing versions around.
Both OnlyOffice and Collabora Online deliver genuine browser-based, simultaneous co-authoring. Multiple people edit the same document live, which is the experience users now expect from Google Docs and Microsoft 365. On this axis they are peers, and either will satisfy a team that wants real-time editing on its own servers.
LibreOffice on its own does not give you this. It is desktop-first, and its strength is the offline editing experience, not multi-user browser sessions. If real-time collaboration is a requirement, you are really choosing between OnlyOffice and Collabora, and reaching for the LibreOffice engine through Collabora rather than LibreOffice directly. This is the single most common source of confusion, and getting it straight saves a lot of wasted evaluation.
Format fidelity
The second axis is what happens to files when they move between your suite and the Microsoft-using outside world.
OnlyOffice has the edge here, and it is not close for complex documents. Because it was engineered around OOXML, .docx, .xlsx, and .pptx files tend to round-trip with less layout breakage than the LibreOffice family. If your organization lives in heavily formatted Word and Excel files exchanged with outside parties, that fidelity is a real, daily quality-of-life difference.
Collabora and LibreOffice share the LibreOffice rendering core, which is excellent for ODF and good for Microsoft formats, but more prone to small layout shifts on the most complex OOXML documents. For ODF-first organizations, public bodies, and teams whose documents stay in-house, this is a non-issue and the open-document heritage is arguably a feature. For teams round-tripping intricate Office files with clients all day, OnlyOffice’s fidelity may justify its other costs.
Self-hosting effort
The third axis is how much of your life the engine consumes.
Collabora Online is the lightest to run. A typical deployment is a single container behind a reverse proxy, which makes it the friendliest option for a small team or a homelab that wants real-time editing without standing up a fleet of services.
OnlyOffice is heavier. Its document server commonly pulls in PostgreSQL, RabbitMQ, Nginx, and Redis, and you should size for a few gigabytes of RAM. That is fine for a team with a platform function and a reason to want OnlyOffice’s fidelity, but it is more moving parts to monitor, back up, and upgrade.
LibreOffice as a desktop suite sidesteps server operations entirely, but then you are not running a collaboration service at all, you are managing desktop installs. Routing the LibreOffice engine into a server means Collabora, and you are back to Collabora’s (lighter) operational profile.
Provenance and governance
In 2026 there is a fourth axis that did not used to matter: where the engine comes from.
This is where the LibreOffice family has a clean story. The Document Foundation is a German non-profit and Collabora is a UK company, so neither carries the provenance questions that hang over OnlyOffice. Indeed Collabora has been one of the most vocal critics of OnlyOffice’s Russian-origin codebase during the Euro-Office fork episode.
OnlyOffice, as we covered in our OnlyOffice review, carries documented Russian origins, a restructuring, a detailed rebuttal, and now a European fork. If provenance is part of what you have to defend, that pushes you toward the LibreOffice family or toward the European-governed fork rather than the original. If it is not part of your threat model, OnlyOffice’s capability speaks for itself. This axis does not pick a winner, but it changes the weighting for sovereignty-sensitive buyers.
Which engine for which deployment
Match the engine to your actual situation:
- Small team or homelab wanting easy, real-time, European-built editing. Collabora Online. One container, real-time, no provenance baggage.
- Team that round-trips complex Microsoft files all day. OnlyOffice, for the format fidelity, if you can run the heavier stack and provenance is not a constraint.
- ODF-first organization or public body. The LibreOffice family, via Collabora for collaboration, for the open-document heritage and clean governance.
- Workstation-centric, offline-first users. LibreOffice desktop, with sync handled separately.
- Sovereignty-sensitive buyer who needs MS fidelity. The European-governed OnlyOffice fork, or Collabora if you can accept the LibreOffice core’s fidelity.
The recurring error is choosing on a feature list and ignoring operations and provenance, or expecting LibreOffice alone to be a collaboration server. Decide which axis dominates for you, and the engine follows.
Final verdict
These three are not rivals so much as different tools that happen to overlap. For most teams self-hosting in 2026, Collabora Online is the sensible default: real-time editing, light to run, and a clean European-built lineage. OnlyOffice is the pick when Microsoft-format fidelity is the priority and you can carry the heavier stack and the provenance conversation. LibreOffice is the indispensable desktop and ODF foundation, and the engine inside Collabora, but not, by itself, the collaboration server people sometimes expect it to be.
Choose by the axis that dominates your situation, collaboration, fidelity, effort, or provenance, and you will land on the right one. For the broader landscape and where these self-hosted engines sit alongside the hosted suites, see our hub on sovereign office suites, and for a fully European-origin suite built on open components, our La Suite numérique review.
