OnlyOffice is a modern, free office suite designed as a powerful alternative to Microsoft Office. It provides a familiar ribbon-style interface and 100% compatibility with Word, Excel, and PowerPoint formats, making it one of the best free options for creating and editing documents, spreadsheets, and presentations.

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Can I open and save Microsoft Word documents properly?

Yes, OnlyOffice supports DOC and DOCX formats with excellent compatibility. Users often report that it handles complex Office documents (especially OOXML) more accurately than alternatives like LibreOffice.

Is OnlyOffice actually free to use?

OnlyOffice offers both free and paid options. The desktop editors are free for personal and offline use, while the full collaboration features (like online document editing with multiple users) usually require a server setup or a paid plan depending on scale and business use.

How do collaboration features work in the free cloud version?

In the free cloud offering, users can create "rooms" to share documents, invite collaborators, and edit in real time. These rooms feature options for permissions and collaboration without requiring integration with other services.

How does OnlyOffice compare to LibreOffice or Microsoft Office?

Many users find OnlyOffice closer in look and feel to Microsoft Office, especially with its ribbon-style interface and better compatibility with DOCX and XLSX files. LibreOffice is often preferred for open-source purists, but OnlyOffice tends to win for modern UI and smoother formatting consistency.

Is OnlyOffice safe and privacy-friendly?

OnlyOffice is often chosen by people who want more control over their data. Self-hosting is a major advantage for privacy-conscious users since documents can stay on your own server rather than being stored in third-party cloud ecosystems

Features

Individual and group rights

Share your documents with an individual or whole team and set different permission levels. Public sharing is also available.

Different co-editing modes

Co-author documents with one of two co-editing modes: (1) Fast: display all changes right after input, or (2) Strict: see co-authors' changes only when they save them.

Tracking changes

Get more control over your documents with Review mode Track your collaborators' changes and reject or accept them when needed.

Version History

Track all changes to your document. Check who made changes and when. Recover previous versions if necessary.

Document comparison

Easily compare two documents to see the differences with revision marks. Accept or reject changes one by one or all at once. Merge the changes and save them as a new version of the original document.

Efficient communication

Tag co-authors and leave comments for them. Communicate in real-time using the built-in chat.

Other Features:

  • Use various styling and formatting tools
  • Insert and manipulate different objects
  • Do even more with a collection of integrated plugins

Community Server is a free open source collaborative system developed to manage documents, projects, customer relationship and email correspondence, all in one place.

What's New

ONLYOFFICE Docs 10.0 is here with around 50 new features, more than 1,000 bug fixes, and about 35 fixed vulnerabilities. From PDFs and spreadsheets to presentations and text documents, these updates are designed to make your everyday work faster, safer, and more productive.

AI tools across the editors

ONLYOFFICE Docs 10.0 brings AI directly into every editor, supporting the full document workflow from content creation to formatting. Because AI understands the context of each file, its suggestions stay relevant and useful.

AI tools are available in a dedicated tab in the editors, where you can launch the AI chat to access them. The most popular actions are provided as default prompts, but the possibilities go far beyond these suggestions.

AI in the PDF Editor

  • AI now works inside PDF files, turning static documents into interactive resources. This is especially valuable for teams that manage long, information-heavy files at scale.
  • Ask questions about the document and get direct answers
  • Generate a summary in a single click
  • Draft emails based on the content of the file
  • Redact sensitive information to protect confidential data
  • And much more

AI in the Document Editor

  • In text documents, AI accelerates writing, editing, and review without pulling users away from their work.
  • Summarize long documents in seconds
  • Rewrite or simplify complex paragraphs
  • Translate text directly on the page
  • Proofread content and highlight key points
  • Build a table of contents and suggest a title
  • Apply formatting automatically for a polished result

AI in the Spreadsheet Editor

  • For data-heavy work, AI reduces the complexity of formulas and large datasets, helping teams move from raw numbers to clear insights.
  • Generate formulas and explain how they work
  • Analyze datasets and identify trends
  • Build forecasts and Pivot Tables
  • Clean up inconsistent data and flag outliers
  • Fill in missing values

AI in the Presentation Editor

  • In presentations, AI helps turn a single idea into a complete, well-structured deck.
  • Create outlines and suggest slide titles
  • Write bullet points and shape the overall structure
  • Add a storytelling flow across slides
  • Generate speaker notes and visual ideas

AI actions, assistants & prompts

  • You can go beyond the default prompts and set up AI tools that fit the way you work:
  • Quick AI actions handle one-time tasks, like changing a text's tone.
  • AI assistants work continuously and respond to changes in your document as you edit.
  • Saved prompts in AI Chat let you reuse your favorite requests, so repeated tasks take just a click.

AI tools your way

  • In the cloud, top up your Wallet to enable the ONLYOFFICE AI service and get started. On server builds, you can connect any AI model, including local models for privacy-sensitive use cases.
  • In both cloud and server environments, you can choose a default model and assign different models to specific tasks.
  • Availability note: In response to user feedback, we've removed built-in AI from the open-source versions. AI tools are installed separately.

ONLYOFFICE Docs + Apps

  • ONLYOFFICE Docs 10.0 gives you modular apps you can mix and match: AI agents, Forms, Rooms, and Files. Each one solves a real, everyday problem, and you only turn on what you actually need.

Here's the key idea: flexibility. Instead of shaping your work around the software, you shape the software around your work. That means less clutter, a cleaner experience, and tools that feel made just for you.

So, apps and editors work as one flexible system. Install the editors, extend their capabilities with apps, and integrate the package into your solution with ease.

PDF Editor: more control and stronger privacy

ONLYOFFICE Docs 10.0 brings the PDF Editor a focused set of tools for cleaner documents, faster signing, and better data protection, which is especially important for teams handling sensitive files.

Remove metadata with Redact. Before sharing a file, strip out hidden information that may otherwise travel with the document.

Previous Release Notes:

All Editors

  • Added Croatian language interface translation (hr-HR, Hrvatska)
  • Moved chart settings from the right panel to a separate Chart design tab
  • Added options for pasting from the clipboard for the Paste button on the top toolbar

Document Editor

  • Implemented the ability to add a horizontal line

Spreadsheet Editor

  • Added the Dark mode support for the sheet

Presentation Editor

  • Added 25 new presentation design themes
  • Added 20 new slide transitions, grouped by category

Forms

  • The app saves the most recently added image in the Signature field so it can be automatically used when filling out the form again
  • Added the "Send for signing" and "Filling status" panels

Security

  • Fixed out-of-bounds read vulnerabilities when converting XLS to XLSX in the following functions: ChartSheetSubstream::recalc, TextPropsStream::readFields, MetroBlob::ReadComplexData, SUPBOOK::serialize_book and ATTACHEDLABEL::serialize_rPr
  • Fixed a vulnerability in GUID generation that allowed an attacker to calculate GUIDs based on their creation time
  • Fixed a vulnerability that allowed bypassing macro sandbox restrictions and accessing environment objects via sloppy-mode this and eval

OnlyOffice Docs 9.3 released: Enhanced PDF Editor, more signature options, Multipage View, Solver in sheets, and more.

Extended signature options for PDF forms

Signing documents digitally should feel as natural as using pen and paper. With the updated signature field in PDF forms, you can offer recipients a seamless and flexible experience. In addition to the available image upload, which now includes the option to remove white backgrounds, users have access to expanded signing options designed for maximum convenience:

  • Custom text: Typing a signature using an elegant, professional font. Perfect when users don't have a stylus or image file handy.
  • Drawing: Drawing a signature directly on the screen using a mouse or touch device for a personal touch.

ONLYOFFICE Docs Enterprise users can now upload a signing certificate to the Admin Panel. This feature enables trusted digital signatures on submitted PDF forms, ensuring that important documents are protected from unauthorized access and modifications.

Where to find: Admin Panel ➙ Settings ➙ PDF Digital Signature

Master your PDFs with new editing tools

Working with PDFs is a daily reality for many professionals. In this release, we've focused heavily on making PDF management more flexible and secure.

Editing password-protected files. Unlock and edit protected PDFs directly if you have the password.

Where to find: Editing mode ➙ Unprotect document

Managing links. Easily create and edit links to external resources or internal pages. These links remain active even in the Commenting mode.

Where to find: Editing mode ➙ Insert tab

Moreover, you will find the following enhancements for the PDF Editor in version 9.3:

  • support for Version History for PDF files;
  • support for editing built-in PDF fonts;
  • ability to redact text from the pop-up tool panel;
  • page print settings for PDFs;
  • support for macros in PDFs (adding/deleting/editing pages, forms, annotations, shapes, tables, images, and diagrams);
  • inserting adjustable fields into a table cell when creating PDF forms.

Document editor: better collaboration and layouts

Writing and editing documents just got smoother with highly requested features that improve both individual focus and team collaboration.

Multipage view. Review layouts more effectively by viewing multiple pages side-by-side.

Where to find: View tab ➙ Multiple Pages

Enhanced comments. Collaboration is clearer than ever. Comments now feature unique user colors for instant identification, with the exact start and end points of the commented text being displayed, so context is never lost.

Where to find: Comments

Header & Footer tab. All header and footer options are now consolidated in one dedicated tab for easy access.

Where to find: Header & Footer tab

Enhanced mouse select. You can now select multiple words or entire paragraphs simply by double- or triple-clicking, making text selection faster and more precise.

Where to find: Double & triple mouse clicking

Spreadsheet editor: Speed and precision

For data analysts and spreadsheet power users, performance is key. We've optimized the ONLYOFFICE Spreadsheet Editor to handle data more quickly and accurately.

First of all, speed improvements are immediately noticeable. The initial rendering of large spreadsheets – specifically those over 3 megabytes – has been accelerated, resulting in less waiting and more productivity when opening large files.

New Solver tool. Solve linear problems using the Simplex method directly within your sheets.

Where to find: Data tab ➙ Solver

Expanded formula library. We've added new functions for regular expressions – REGEXTEST, REGEXREPLACE, and REGEXEXTRACT – improving how you handle complex text data.

Where to find: Formula tab

Dynamic array support. The introduced option allows formulas to return multiple results that automatically "spill" into neighboring cells. This supports modern spreadsheet practices.

Changelog

All Editors

  • Added the Use AI functions option to the application settings
  • Added Box and Dropbox cloud providers
  • Added the Pin option to the Recent files and Recent folders lists on the start page
  • Added the ability to work with files in separate windows (macOS)
  • Added the Open File option to the application settings to open a file in a separate window (macOS)
  • Implemented the ability to add hyperlinks to images, shapes, or groups
  • Implemented all settings for texture fills for images
  • Updated macro recording in documents, spreadsheets, and presentations

Document Editor

  • Added Multiple pages view
  • Added the Zoom to 100% and Multiple pages buttons to the View tab
  • Changed the appearance of comments. Now a user's color is used and the beginning and end of the comment are displayed
  • Implemented the ability to select words/paragraphs by double/triple-clicking the mouse
  • Added saving to the MD format
  • Moved header and footer settings to a separate Header & Footer tab

Spreadsheet Editor

  • Added support for new functions: REGEXTEST, REGEXREPLACE, REGEXEXTRACT
  • Improved work of the COUNTIF function
  • Added support for dynamic arrays
  • Added Solver for solving linear problems (Simplex LP)
  • Changed the color of the resolved comment indicator
  • Added the ability to select multiple separators when splitting text into columns/pasting from the clipboard
  • Added the Format button, which combines various functions for working with sheets/rows/columns
  • Added support for TSV files for reading
  • Added options for pasting from the clipboard for the Paste button on the top toolbar

Presentation Editor

  • Added support for GIF animations playback in the slideshow demonstration mode

Forms

  • Added the signature settings window with the ability to draw and add text to signatures
  • Added the ability to stretch fixed forms to fit the table cell size using the context menu
  • Added the Protection tab, which duplicates the Protect functionality in the File menu
  • Added saving to the MD format

PDF Editor

  • Added version history
  • Added Multiple pages view
  • Added the Zoom to 100% and Multiple pages buttons to the View tab
  • Implemented a password prompt when enabling the Edit PDF mode if the file is protected from editing
  • Added support for Link annotations with the ability to add them both to an area and to text on a page
  • Added the ability to continue editing PDF using embedded fonts
  • Added the ability to redact text using the auxiliary pop-up toolbar
  • Added parameters for printing pages

Diagram

  • Added print preview

Fixes

Security

  • Fixed several vulnerabilities with out-of-bounds read in XLS processing/conversion (via FilePass, HLink, rgXTI.itabLast, Formula record cce, ShapePropsStream, and CRN.colLast records/fields) leading to information leak and ASLR bypass
  • Fixed vulnerabilities with untrusted pointer dereference in XLS processing/conversion (via pictFmla.cbBufInCtlStm and other vectors) leading to information leak and ASLR bypass
  • Fixed a DOM-based XSS vulnerability when executing a macro using dynamic import() (CVE-2021-43446, CVE-2023-50883, CVE-2024-44085)
  • Fixed the vulnerability in the update service, that allows you to perform actions with files with system privileges