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What is ONLYOFFICE?

ONLYOFFICE is an open-source office suite built around document editing and real-time collaboration. Its core product, ONLYOFFICE Docs, lets you view, edit and co-edit text documents, spreadsheets and slides, work with PDFs and fillable forms, and handle conversions such as PDF and Markdown/HTML. It is designed to be self-hosted or embedded rather than used only as a standalone consumer app.

How people typically use it

• As a private office environment: ONLYOFFICE DocSpace gives teams rooms where they invite people and collaborate on files from desktop or mobile.
• Inside tools you already use: ONLYOFFICE Docs can be connected to platforms such as Nextcloud, Moodle, WordPress and others through ready-made integrations, so editing happens without leaving that platform.
• Embedded in your own product: Developers can integrate Docs into a service and offer document editing under their own brand.
• Offline or on the move: Free desktop apps for Windows, Linux and macOS and mobile apps for iOS and Android cover local editing.

Where it stands out

Who it suits

Teams that need control over where documents live, organizations with compliance or data-residency requirements, and platforms that want to add editing without building it from scratch. If you mainly want a familiar cloud drive with light editing, a mainstream hosted suite may be simpler; if control, embedding or open source matter, ONLYOFFICE is worth evaluating.

Next step: decide which route fits you — DocSpace for a ready collaboration space, an integration if you already use a supported platform, or an embedded deployment if you are building a product — then test with a real document and a small group.

How does ONLYOFFICE ensure document security and privacy?

ONLYOFFICE approaches document security from three angles: the code itself, how documents are protected, and where the AI processing happens.

Open source and standards compliance. The source code is publicly available on GitHub, so security teams can inspect it rather than take the vendor's word for it. ONLYOFFICE also states compliance with international security standards. For organizations with strict procurement rules, auditable code and recognized certifications are often the deciding factor over feature checklists.

Encryption at three levels. Documents are encrypted at rest, in transit, and end-to-end. That covers the main risk points: storage, network transfer, and the channel between collaborators.

Access and monitoring controls. Extra document permissions and secure access and monitoring tools let administrators restrict who can view, edit, comment, or fill forms, and track activity. This matters most in shared or multi-tenant environments.

Local AI option. AI features — document generation, translation, rewriting, grammar checking, and text extraction from scanned PDFs — can run on a fully local model. You can also connect any AI model and assign different models to different tasks. A local model keeps sensitive text from leaving your infrastructure, which is the key privacy trade-off: cloud models are typically faster and more capable, while local models give you full data control.

Practical scenario. A law firm handling client contracts would likely run ONLYOFFICE on its own servers, enable end-to-end encryption for client-facing sharing, restrict download and print permissions on drafts, and route AI summarization to a locally hosted model so clause text never reaches a third party.

Next step. Decide which of the three layers your organization actually needs. If regulatory data residency is the driver, prioritize self-hosting and local AI; if the concern is casual oversharing, start with document permissions and monitoring. The security features page at ONLYOFFICE details each control.

Can I integrate ONLYOFFICE with my existing platform or app?

Yes. ONLYOFFICE is designed to be embedded in other software, not just used as its own destination site. The product page describes three integration paths: connecting ONLYOFFICE Docs to an app you already use, embedding Docs into a service you build, and using the hosted ONLYOFFICE DocSpace.

H3 Where integration fits

• Platforms you already run: ONLYOFFICE lists 40+ ready integrations, including Box, Moodle, Nextcloud, Odoo and WordPress. This is the shortest route if your document storage or LMS already exists.
• Your own product: you can integrate ONLYOFFICE Docs into your service so customers edit and build documents under your brand. This suits SaaS products that need document editing without building an editor from scratch.
• Hosted workspace: ONLYOFFICE DocSpace gives you rooms where you invite people and collaborate from desktop or mobile. Choose this when you want a ready environment rather than an embedded component.

H3 A quick comparison

H3 Practical test

Pick one real document workflow, such as a contract that a customer must review and sign off, and run it end to end in a trial. Check format fidelity with your existing Word and Excel files, how comments and tracked changes appear, and whether permissions match your process. The page also notes co-editing modes, built-in chat, and audio or video calls through Jitsi or Rainbow, so test those if collaboration is the point.

If your platform is not on the ready-integration list, the embedding route is the one to investigate. Start at ONLYOFFICE and check the integration documentation for your specific platform before committing.

How does ONLYOFFICE compare to Microsoft Office in terms of compatibility and features?

ONLYOFFICE is built around compatibility with Microsoft Office file formats, so for most everyday document, spreadsheet and presentation work it behaves as a drop-in alternative rather than a separate ecosystem. The page presents it as a suite that can open and edit Word, Excel and PowerPoint files, plus handle PDFs, fillable forms, Markdown and HTML. That matters if you regularly receive .docx or .xlsx files from clients, schools or colleagues and need to return them without reformatting.

The bigger difference is deployment and control, not raw feature parity. ONLYOFFICE is open source, can run on your own infrastructure, and offers encryption at rest, in transit and end-to-end, along with document permissions and monitoring tools. Microsoft Office, by contrast, is primarily a cloud subscription service tied to Microsoft's ecosystem, with desktop apps and deep integration into Windows and Microsoft 365 collaboration. If your priority is owning the server and keeping documents inside your network, ONLYOFFICE is the more natural fit; if your priority is the familiar Microsoft interface, Outlook and Teams integration, or the broadest third-party templates and macros, Microsoft remains the safer default.

Where they line up

• File formats: Both target the same Office formats, so round-tripping .docx, .xlsx and .pptx is the core promise. Complex layouts, unusual fonts, macros and heavily formatted spreadsheets are where any non-Microsoft suite can drift, so test your real files rather than assuming perfect fidelity.
• Real-time collaboration: ONLYOFFICE lists character- and paragraph-level co-editing, comments, mentions, track changes, built-in chat, and audio/video calls via Jitsi or Rainbow. Microsoft offers comparable co-authoring through Microsoft 365, with its own chat and meeting stack.
• PDF and forms: ONLYOFFICE stands out by bundling PDF reading, editing, form building and filling into the same suite. Microsoft handles PDFs too, but often pushes advanced PDF work toward separate tools or premium tiers.

Where ONLYOFFICE differs most

• Self-hosting and privacy: Running your own instance is a first-class option, not an afterthought.
• Integrations: The page lists 40+ connectors including Nextcloud, Moodle, WordPress, Odoo and Box, aimed at embedding editing inside platforms you already run.
• AI flexibility: It advertises AI assistants and smart agents, with the ability to connect any model, including a fully local one, and assign different models to different tasks. Microsoft's Copilot is powerful but tied to Microsoft's own AI services and licensing.
• Editions: ONLYOFFICE comes as a hosted DocSpace, a component you connect to an existing platform, an embeddable SDK for your own product, and free desktop and mobile apps for offline work.

A practical way to decide

Pick a representative week of your real work: a tracked-changes contract, a spreadsheet with formulas and charts, a slide deck with custom fonts, and a scanned PDF you need to make searchable. Run each through both suites and note where formatting breaks or a feature is missing. If the files survive and your team mainly needs editing plus collaboration, ONLYOFFICE's self-hosting, open source code and local-AI option are strong reasons to switch. If your workflow depends on Microsoft-specific macros, Teams meetings or the broader Microsoft 365 ecosystem, staying with Microsoft avoids friction.

For a broader look at the suite and its deployment options, see ONLYOFFICE.

What AI-powered features does ONLYOFFICE offer for document creation and editing?

ONLYOFFICE builds AI into its document editing through optional virtual assistants and smart agents, rather than making AI the core of the suite. According to the product page, you can generate documents, spreadsheets, slides, and fillable PDF forms in seconds; create text, images, and even code; get instant answers and find information; translate, rewrite, and check spelling or grammar; and extract text from scanned PDFs. The page also states you can connect any AI model — including a fully local one — and assign different models to different tasks.

What that means in practice

• Writing and rewriting: Draft a section, then ask the assistant to shorten it, change tone, or fix grammar. Useful for routine reports and proposals.
• Spreadsheets and slides: Generate initial structures or formulas rather than building from a blank file.
• PDF workflows: OCR-style text extraction from scanned PDFs matters if you receive paper documents or image-only files.
• Code: The page mentions building code, which points to technical users working inside documents rather than a dedicated IDE.

The trade-off worth noting

Model choice is the differentiator. A cloud model is convenient and usually stronger; a local model keeps sensitive content inside your infrastructure but may be slower or less capable. ONLYOFFICE's security section explicitly supports "secure, local AI models," so regulated teams can use AI without sending documents to a third party. The page frames this under "Security first" alongside open-source code and three levels of encryption.

A concrete scenario

A small law office needs to summarize scanned contracts. With ONLYOFFICE they could extract text from the scanned PDF, then run summarization through a locally hosted model so client material never leaves the office network. A marketing team, by contrast, might accept a cloud model for faster drafting and translation.

How to decide

If your main need is AI-assisted drafting and you don't handle confidential material, connect a cloud model for quality and speed. If confidentiality governs, test a local model first and check whether its output meets your standard before rolling it out. Either way, AI here augments editing and collaboration — co-editing, comments, track changes and chat are separate, non-AI features covered on the same page.

Next step: open a sample document and run one real task, such as translating a page or extracting text from a scanned PDF, to judge output quality before committing your team. For the underlying editor itself, see ONLYOFFICE.

Is ONLYOFFICE free to use, and what are the pricing options?

ONLYOFFICE is best understood as free to start, with paid options for organizations that need more control, branding or scale. The page itself emphasizes several free entry points rather than a single price list.

What you can use without paying, based on the page

• Free desktop editors for Windows, Linux and macOS, for offline work.
• Free mobile apps for iOS and Android.
• A free account in ONLYOFFICE DocSpace for creating rooms, inviting people and collaborating.
• ONLYOFFICE Docs can be connected to platforms you already use, with 40+ integrations listed, including Box, Moodle, Nextcloud, Odoo and WordPress.

Where paid options come in The page points to business and platform scenarios rather than quoting figures: integrating Docs into your own service under your brand, connecting it to your web platform, and using it as part of ONLYOFFICE Workspace. For those, ONLYOFFICE typically sells editions aimed at teams and enterprises, but the page does not state prices, so you would need to request a quote or check the official pricing page.

A practical way to decide

• Individual or small team, just editing documents: start with the free desktop apps or the free DocSpace account.
• Already using Nextcloud, Moodle, WordPress or another supported platform: the free connector may be enough to begin.
• Building a product or running a large organization: you are likely in paid territory, and features like branding, compliance and enterprise access controls matter more than the sticker price.

For current numbers, check ONLYOFFICE's own pricing page at ONLYOFFICE. If you want a concrete next step, install the free desktop app first, then test DocSpace with a small group before evaluating paid editions.