The office suite is one of those things you only notice when it fails you. Formatting that collapses when a document travels from Word to Google Docs to LibreOffice. (For the open-source options worth switching to, see our guide to the best open-source software alternatives in 2026.) A PDF that refuses to surrender its table. A spreadsheet formula that computes differently on a colleague's machine. For an open-source project used by more than 21 million people, ONLYOFFICE has spent years smoothing exactly those rough edges. On October 10, it made its biggest move yet.
Version 10.0 adds context-aware AI to every editor, breaks the suite's satellite features into four free modular apps released under the AGPL v3 license, and patches 35 security vulnerabilities. Around 50 new features and more than 1,000 fixes round out the release across the online, desktop, and mobile editors. It is a release that says something larger about where productivity software is headed: intelligence everywhere, but on your terms.
What ONLYOFFICE is
A quick orientation for readers who have never left the Microsoft 365 or Google Workspace universe. ONLYOFFICE is an open-source office suite with editors for documents, spreadsheets, presentations, forms, and PDFs. It runs in the browser, on the desktop, or on a server your organization controls. Its selling point has always been fidelity (documents that look the same everywhere) and sovereignty (the option to self-host so your files never leave your infrastructure).
That sovereignty angle matters more than it used to. As AI features flood productivity tools, they usually arrive with a catch: your data travels to someone else's cloud to be processed. ONLYOFFICE's pitch with 10.0 is that you can have the AI without surrendering the data.
AI that stays in the document
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The headline feature is a dedicated AI tab with built-in chat inside each editor: documents, spreadsheets, presentations, and PDFs. Instead of copying content into a separate chatbot, you draft, summarize, translate, clean, and format from within the file you are working on. Ready-made prompts cover the common jobs, and custom AI actions, assistants, and saved prompts let teams automate routine work.
The use cases ONLYOFFICE cites are deliberately unglamorous: legal teams summarizing contracts, analysts generating forecasts or pivot tables, managers turning rough notes into structured presentations. This is AI pitched as office plumbing, not a demo.
The more interesting part is who chooses the model. Organizations select AI based on quality, speed, and cost. Cloud users can enable the feature through OpenRouter, while server deployments can connect any model, including ones running locally on their own hardware. The company states that sensitive data remains within the organization's infrastructure. That is a meaningfully different architecture from the default AI office feature, where your prompts are processed on the vendor's own cloud.
The pitch is AI in your office suite without your documents leaving your building.
Four free apps
ONLYOFFICE 10.0 by the numbers
From the October 10, 2026 release announcement.
Note: Figures from the official release announcement.
Alongside the editors, 10.0 introduces four free apps that extend ONLYOFFICE Docs, all under the AGPL v3 license. AI Agents automate workspace tasks with intelligent search, a personalized knowledge base, and extended reasoning powered by MCP (Model Context Protocol) servers. Forms handles data collection and analyzes responses. Files centralizes document storage with access controls. Rooms supports secure collaboration, including virtual data rooms for confidential content.
In the cloud, the apps are on by default. On self-hosted servers, a single command installs them. The modular design is worth noting: instead of one monolith that grows forever, the suite becomes a core plus optional pieces. That is easier to audit, easier to deploy, and easier to partially adopt if you only want part of it.
The polish underneath
Big releases often neglect the small things. This one does not, at least on paper. The PDF editor gains metadata removal (useful for privacy), customizable annotations, automatic table recognition, and reusable signatures. In the document editor, co-authors can follow each other's cursors in real time, a new "Keep with next" option keeps related content together, and right-to-left language support is more reliable. Spreadsheets get faster calculation, optimized functions, formula hints, and an animated copy marquee. Presentations gain new view modes, extended print settings, and GIF or video export for slides.
On desktop, the editors get a refreshed homepage, redesigned templates and clouds sections, Odoo integration, and visual improvements on Linux, where ONLYOFFICE has a loyal following. In the desktop community edition, AI tools ship as an optional add-on rather than built in. The free iOS and Android apps add an AI assistant with new providers (Grok and DeepSeek are named), AI AutoFill for forms, and voice input for working on the go.
35 fixes for an AI-shaped threat landscape
The security section of the release is brief but pointed: 35 vulnerabilities patched, with the company noting that AI-driven threats continue to evolve. This is the unglamorous backbone of any AI feature release. An assistant that can read your documents is also an assistant that must be hardened, and the cadence of roughly 50 new features plus more than 1,000 fixes suggests the project treats security as part of the product rather than a press release checkbox.
Why it matters
Step back and the strategy is clear. Microsoft charges a per-user monthly premium for Copilot in its office suite. Google bundles Gemini into Workspace. ONLYOFFICE is betting that a growing number of organizations, governments, universities, and privacy-sensitive companies want the same class of features without the subscription economics and without their documents leaving the building.
That is not a mass-market play. It is a sovereignty play, and the audience is real: European public administrations pursuing digital sovereignty, companies in regulated industries, anyone whose legal team reads training-data clauses with a frown. The AGPL licensing of the new apps reinforces the thesis, keeping the ecosystem open and forkable.
It also lands at a moment when AI-in-office features are being renegotiated. Workers are discovering that helpful assistants can also be surveillance instruments, with prompts logged and documents swept into model training. A setup where the organization chooses the model and keeps data on its own servers sidesteps the most common objections in one move. Whether many organizations will take on the operational burden of self-hosting to get it is the open question.
What to check before you switch
A few caveats, framed as analysis rather than announcement. Features differ by edition: cloud, server, and desktop community are not the same product, so confirm what is included in your setup before planning around it. AI output always needs a human check, especially for legal or financial work. And while the architecture lets sensitive data stay inside your infrastructure, your actual privacy depends on the model and configuration you choose, so review that with your IT team before turning anything on. The sensible rollout is the boring one: try it on a low-risk file first, see how the AI behaves, and then decide how far into daily work it belongs.
References
ONLYOFFICE, "ONLYOFFICE 10.0 brings AI tools, modular apps, and stronger security to its open-source office suite," PR Newswire, October 10, 2026 (via Morningstar). Newsy Today, "ONLYOFFICE Releases 10.0 with AI Tools and Security Fixes," EQS News report, October 8, 2026. TattwaTech, "ONLYOFFICE 10.0: AI Tools, New Apps and a Security Upgrade Explained," October 2026.
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