LibreOffice vs ONLYOFFICE

At a Glance

LibreOffice and ONLYOFFICE are the two European office suites that public bodies and privacy-conscious companies actually deploy at scale. They approach the same problem from opposite ends. One is a desktop suite from a Berlin non-profit, free in every sense and content to run with no network at all. The other is a Latvian editing engine built for the browser, for co-editing, and above all for opening a Microsoft file that looks the way its author intended.

Neither is a watered-down Microsoft Office substitute. Both are open source, both are EU-headquartered, and both run in production at organisations that cannot afford document problems. Choosing between them comes down to where documents live and how many people touch them at once.

Format Fidelity: ODF Purity Against OOXML Accuracy

LibreOffice uses the Open Document Format natively, an ISO/IEC 26300 standard that no single vendor controls. Any application implementing the standard can read and write those files, which is why ODF appears in member state digital strategies as the preferred format for public records. LibreOffice also reads and writes .docx, .xlsx, and .pptx, with strong fidelity across ordinary business documents. Friction appears at the edges: Excel-specific charts, Power Query transformations, complex nested layouts, and VBA macros survive a round trip imperfectly.

ONLYOFFICE inverts the priority. Rendering Microsoft's formats accurately is the project's primary engineering goal. ONLYOFFICE claims better format preservation than any other open-source suite, LibreOffice included. Treat that as a vendor claim rather than a published independent benchmark, though it does match what most users report in practice. Documents with nested tables, embedded objects, footnotes, tracked changes, and pivot tables tend to open looking as they do in Microsoft Office. For an organisation whose clients and regulators send Word and Excel attachments daily, that single property outweighs most feature comparisons.

The reverse trade-off is archival independence. ODF is a genuinely vendor-neutral container, while OOXML remains a standard whose practical behaviour follows Microsoft's implementation choices. Organisations obliged to keep records readable for decades weight that difference heavily.

Edge: ONLYOFFICE for documents arriving from Microsoft Office. LibreOffice for records that must outlive any single vendor.

Collaboration and Co-Editing

Here the gap is not a matter of degree.

LibreOffice's desktop applications have no real-time co-editing, so two people cannot type in the same document at the same time. Collaboration in Writer is asynchronous — tracked changes with per-reviewer identification, comments, and a file passed between people. That model still works for contracts and reports with a single owner, and it fails badly on a document a team must finish together before Friday. Our review counts this among LibreOffice's genuine limitations, and the standard remedy is to pair it with Collabora Online, the browser-based build, or with ONLYOFFICE itself.

ONLYOFFICE was designed the other way round. Real-time co-editing with live cursor tracking is standard across documents, spreadsheets, and presentations, alongside comments, mentions, track changes, and document comparison. DocSpace adds room-based structure on top: shared spaces with roles running from owner and room admin through editor and viewer, plus guest access for external collaborators who never need a full account. That is closer to how teams used to Google Docs expect editing to behave.

Access follows the same pattern. ONLYOFFICE ships mobile apps for iOS and Android, while LibreOffice has no first-party mobile client and no built-in cloud sync, leaving storage and access management entirely to the user.

Edge: ONLYOFFICE, decisively, for teams editing together. LibreOffice where collaboration means passing a file to the next reviewer.

Deployment and Day-to-Day Administration

Deployment shape determines the administrative burden here, and the two products barely overlap.

LibreOffice installs on Windows, macOS, and Linux, and ships as the default suite on most Linux distributions. There is no account to create, no activation, and no server to run. An administrator's job is packaging and updating endpoints, which is well-trodden work, and a fully air-gapped installation is supported for defence and critical-infrastructure environments.

ONLYOFFICE arrives in three shapes, and choosing between them matters more than any feature list. Desktop Editors cover Windows, macOS, and Linux for offline work. Document Server is the self-hosted engine, deployed with Docker and connected to file platforms including Nextcloud, ownCloud, Seafile, Moodle, Confluence, and SharePoint. DocSpace is the hosted option, with data held in EU data centres.

Running Document Server means running a server: capacity planning against concurrent editing connections, container upgrades, and integration maintenance. That overhead buys central control — one place to patch, one place to enforce access policy, and browser access from any device. Teams weighing the Nextcloud pairing specifically will find it covered in our Nextcloud and ONLYOFFICE comparison.

Edge: LibreOffice for the lowest operational overhead. ONLYOFFICE where central administration and browser access justify running a server.

Feature Depth and Automation

LibreOffice is the deeper suite, and it is not close. Six applications ship in the box: Writer, Calc, Impress, Draw for vector graphics and diagramming, Base as a database front-end for HSQLDB, MySQL, and PostgreSQL, and Math for formula editing. Calc carries more than 500 functions with pivot tables and conditional formatting. Writer's master documents hold long manuals and theses together, EPUB export covers digital publishing, and PDF export includes accessibility, form, and encryption options. Automation runs through a macro IDE supporting LibreOffice Basic, Python, and BeanShell, and an extension marketplace of 300-plus add-ons adds grammar checking, bibliography tools, and database connectors.

ONLYOFFICE concentrates on the three editors most people open daily, plus a PDF viewer and form filler. Its spreadsheet editor supports over 400 functions with pivot tables and conditional formatting, which is capable but a step behind Calc. Built-in form creation and e-signature capability handle contracts and onboarding paperwork without a separate tool, and the plugin marketplace covers Draw.io, Zotero, and Mendeley.

Macros are where a migration cost hides. ONLYOFFICE uses JavaScript and does not support Microsoft VBA at all, so existing Excel automation has to be rewritten. LibreOffice's VBA compatibility is imperfect but real, which makes it the gentler landing place for a spreadsheet estate built on macros. ONLYOFFICE's weak point, as our review notes, is desktop feature depth for power users working offline.

Edge: LibreOffice for depth, offline power, and macro migration. ONLYOFFICE for form workflows and collaborative review.

Cost and Licensing

LibreOffice is free under the Mozilla Public Licence 2.0, with no tiers, no trials, and no paywalled features. A freelancer and a 10,000-seat ministry download an identical build. Support contracts exist through certified providers, Collabora among them, priced per installation or per user — that is how large deployments fund reliable response times. Our value-for-money rating is 10.0, which no priced product can match on that axis. The honest cost sits elsewhere: testing critical documents, retraining staff, and converting macros are all real line items in a migration plan.

ONLYOFFICE is freemium, and its licensing is the more complicated of the two. Community Edition is free to self-host with up to 20 concurrent editing connections, and that cap counts active editing sessions rather than readers. Beyond the limit, Document Server licences are priced per concurrent connection. DocSpace Free covers up to five users with 2 GB of storage. Paid DocSpace Business pricing is custom, adding SSO, LDAP, and custom branding, while Desktop Editors are free for personal use with a commercial licence for business.

The five-user cloud ceiling is low enough that most teams evaluating DocSpace reach a paid plan quickly, which our review flags as a genuine drawback. Self-hosting is where the free tier earns its 8.5 value rating: twenty concurrent editors, full feature set, no licence fee.

Edge: LibreOffice — free with no ceiling is hard to argue with. ONLYOFFICE for teams whose limit is concurrency rather than headcount.

EU Sovereignty and Public-Sector Adoption

LibreOffice carries the strongest public-sector track record in European office software. The EU institutions, the Italian Ministry of Defence and the French Gendarmerie have all deployed it at scale, as deliberate moves away from Microsoft licensing and toward digital sovereignty. Munich is the cautionary counter-example. Its celebrated LiMux migration was reversed by a 2017 council vote back to Microsoft. A fresh open-source push announced in 2024 is a renewed commitment rather than a completed deployment. Its steward, The Document Foundation, is a Berlin non-profit; the application sends nothing to any server, telemetry is off by default, and no account exists to create. That posture earns 9.5 for EU compliance, and it is the simplest possible GDPR position, because the data controller never loses custody of a document.

Ascensio System SIA develops ONLYOFFICE from Riga, inside the EU, and its compliance story splits by deployment. Self-hosted Document Server has no telemetry and no external data flows, so nothing leaves the customer's infrastructure. DocSpace stores data in EU data centres, with GDPR export and deletion features and a DPA available. AGPL v3 licensing on Document Server means the code can be audited line by line, which regulated buyers and government procurement teams increasingly ask for. Our EU compliance rating for ONLYOFFICE is 8.5.

Edge: LibreOffice on institutional track record and zero data movement. ONLYOFFICE for auditable source with a hosted option that stays inside the EU.

When to Choose LibreOffice

Choose LibreOffice when documents are authored more than they are co-edited. Long reports, contracts, theses, budget models, and archival records fit the desktop model exactly — one owner, one review cycle. The suite's depth across six applications has no equivalent at any price.

It is also the right answer when cost or connectivity constrains the decision. Zero licence cost across an entire organisation removes a recurring line item outright. Full offline operation, with no activation and no account, suits air-gapped networks, field research, and security policies that forbid cloud services.

Pick LibreOffice if you need maximum depth, minimum dependency, and a vendor-neutral archive format.

When to Choose ONLYOFFICE

Choose ONLYOFFICE when several people work inside the same file. Real-time co-editing, room-based permissions, comments and mentions, and browser access from any device describe the daily reality of most modern document work, and LibreOffice's desktop applications do not provide them.

Format compatibility is the other decisive case. Organisations exchanging complex Word, Excel, and PowerPoint files with clients, partners, or authorities gain more from ONLYOFFICE's rendering accuracy than from any additional feature. Adding self-hosted Document Server to an existing file platform keeps that capability inside your own infrastructure, and Community Edition covers up to twenty concurrent editors for nothing.

Pick ONLYOFFICE if your documents are shared, your counterparties use Microsoft Office, and your team works in the browser.

The Verdict

Both suites are credible, both are open source, and both are genuinely European, which makes the decision unusually clean — they succeed and fail in opposite places.

LibreOffice is the more complete piece of software. Six applications, 500-plus spreadsheet functions, a real macro environment, an ISO-standard native format, and a price of nothing add up to the strongest desktop office suite in Europe. Missing real-time co-editing, mobile apps, and cloud sync is what you accept in exchange, and for single-author work that is no loss at all.

ONLYOFFICE fits how most organisations actually work now. Documents arrive as OOXML, several people edit them at once, and access happens from a browser as often as from a desktop. ONLYOFFICE handles all three, self-hosts cleanly, and asks for a server and a licensing decision in return.

The practical answer for many teams is to stop treating this as an exclusive choice. LibreOffice on the desktop for heavy authoring and offline work, ONLYOFFICE on the server for shared editing and Microsoft-format exchange, is a common and coherent arrangement. Forced to pick one, take LibreOffice if your documents mostly have a single author, and ONLYOFFICE if they mostly have several.