ONLYOFFICE Docs is a free collaborative online office suite of viewers and editors for text documents, spreadsheets, presentations, forms, PDFs and diagrams, intended for teams and organisations that need real-time document collaboration either inside their own infrastructure or embedded in a third-party file-sharing platform.

What it is

ONLYOFFICE Docs is the suite that builds on the Office Open XML ecosystem: it reads and writes .docx, .xlsx and .pptx files natively and, according to the topic list, also covers .odt, .ods and .odp. The repository publishes the backend server software layer that serves the Document Editor, Spreadsheet Editor, Presentation Editor, Form Creator, PDF Editor and Diagram Viewer. It is written primarily in Shell, licensed under AGPL-3.0, and has been distributed under the ONLYOFFICE Docs name since version 6.0, when the project previously known as Document Server was renamed.

The concrete problem it solves is collaborative editing of office files without pulling documents out of the storage and platform a team already uses. ONLYOFFICE Docs can run as part of ONLYOFFICE DocSpace or ONLYOFFICE Workspace, or it can be attached to third-party sync and share solutions such as Odoo, Moodle, ownCloud and Seafile so that real-time editing happens directly inside those interfaces rather than in a separate, disconnected service. The project is available in three tailored editions: Community, Enterprise and Developer.

Key capabilities

• Six editors and viewers in one suite: ONLYOFFICE Document Editor, Spreadsheet Editor, Presentation Editor, Form Creator, PDF Editor and Diagram Viewer, covering create, edit, save and export of documents, sheets, slides, PDFs and forms.
• Full compatibility with Office Open XML formats, with the repository topics additionally listing .odt, .ods and .odp.
• Real-time collaborative editing of the same file by multiple users.
• Advanced editing features including AI-powered assistants, reviewing, spell-checking, accessibility support, scalable UI options with dark mode, and security tools and services.
• Localization: the interface is available in 46 languages, with RTL support and hieroglyph support.
• A plugin and macro architecture with a documented API, a dedicated GitHub plugins repository, and a Marketplace app directory for browsing existing plugins.
• Distribution as three editions, Community, Enterprise and Developer, so the same suite can be deployed under different terms.

Who uses it and how

• Teams already on ONLYOFFICE DocSpace or ONLYOFFICE Workspace use Docs as the editing layer inside those environments, without installing a separate office product.
• Organisations running existing sync and share platforms such as Odoo, Moodle, ownCloud or Seafile add ONLYOFFICE Docs to enable collaborative editing within the interface their users already open.
• Developers extend the editors through the plugin and macro API, and publish or consume extensions from the GitHub plugins repository and the Marketplace.
• International and multilingual teams rely on the 46 interface languages, along with RTL and hieroglyph support, for users who do not work in Latin-script interfaces.
• Operators deploy the backend server software layer from the ONLYOFFICE/server repository, which is the base for all other components of the suite.

Getting started

The README points to the three editions, Community, Enterprise and Developer, as the entry path, and the homepage offers a see-it-in-action demonstration of the suite; the repository itself publishes tagged releases under the DocumentServer name. No Docker image, package name or compose file appears in the README excerpt provided here, so the edition selection is the documented starting point.

How it compares

No list of paid products that this project replaces is provided in the facts, and the facts name no direct competitor among office suites. It stands alone in this registry under the Productivity & Utilities / Office Suites category.

When to use it — and when not to

A self-hoster must run the backend server software layer from the ONLYOFFICE/server repository, and should accept the copyleft obligations that come with the AGPL-3.0 licence, along with a sizeable open backlog of roughly 1,135 open issues. Teams that want a fully managed service with no server component to operate, or that need edition-by-edition licence terms spelled out, should look carefully before committing, because the README excerpt does not detail what separates the Community, Enterprise and Developer editions.