Available
Browser-based experience
- View documents from SharePoint
- Edit DOCX documents and XLSX spreadsheets
- View PDFs
- Save changes back to SharePoint
Microsoft ends support for Office Online Server on December 31, 2026
Keep SharePoint.
Replace Office Online Server.
BoldDocServer is a self-hosted WOPI editor for SharePoint Server. Your users open Word, Excel and PDF files from SharePoint, work with them in the browser and save changes straight back. SharePoint stays your document repository, and BoldDocServer runs as a Windows container inside your own infrastructure, connected through WOPI over HTTPS.
Free for 30 days, then $3.50 per user per month, billed yearly. See pricing · Read the docs
BoldDocServer is built by Syncfusion. For more than 25 years, Syncfusion customers have included:
25+years in business
47K+Syncfusion customers
1M+developers
400+Fortune 500 companies
—days left
After December 31, 2026, Office Online Server no longer receives security updates, bug fixes or technical support from Microsoft. SharePoint Server farms that rely on it for browser viewing and editing need a supported alternative.
Microsoft's announcement ↗What changes on December 31, 2026
When Office Online Server retires, browser editing goes with it
Many organizations keep SharePoint Server on-premises so documents stay inside their own environment. When Office Online Server retires, those teams lose in-browser viewing and editing, and users fall back to downloading, editing on the desktop and uploading again.
BoldDocServer restores a direct workflow: open the file in SharePoint, work on it in the browser, and the changes go back to the same file. SharePoint keeps storage and permissions. Only the editing layer is new.
Meet BoldDocServer
What is BoldDocServer?
Option 3, ready to deploy. BoldDocServer is a self-hosted WOPI application from Syncfusion that lets SharePoint Server users view and edit Word, Excel and PDF files in the browser. It takes over the browser editing that Office Online Server provided, while SharePoint keeps storage, permissions and versioning.
| Works with | SharePoint Server 2016, 2019 and Subscription Edition |
|---|---|
| Edit in the browser | Word (DOCX) and Excel (XLSX) |
| View in the browser | PDF, with annotations where enabled |
| Coming soon | PowerPoint (PPTX) |
| Integration | WOPI over HTTPS |
| Deployment | Windows container on Windows Server, inside your network |
| Where documents live | In SharePoint; changes save back to the same file |
| Users need | A modern browser with JavaScript; no desktop editing app |
| Free trial | 30 days |
| Price | $3.50 per user per month, billed yearly; volume pricing from 100 users; minimum 25 users. See pricing |
| Made by | Syncfusion, Inc. |
Why BoldDocServer
Four reasons SharePoint teams choose it
Keep SharePoint as it is
Libraries, permissions and versioning do not change. Only the editing layer is new.
Runs on Windows Server
BoldDocServer is a Windows container, so it runs on the same platform as your SharePoint farm, inside your network.
Prices you can see up front
$3.50 per user per month, falling to $2.10 with volume. Work out your exact cost with the pricing calculator, with no quote needed.
Built on Syncfusion's editors
The Document Editor, Spreadsheet Editor and PDF Viewer inside BoldDocServer are used in production by thousands of companies.
How it works with SharePoint
SharePoint stores the document. BoldDocServer edits it.
Here is what happens when someone opens a file. BoldDocServer integrates with SharePoint Server through WOPI, the protocol a document host uses to talk to a document application. SharePoint keeps the repository. BoldDocServer provides the browser-based viewing and editing.
Your network
Document repository
SharePoint Server
- Document libraries and storage
- Users and permissions
- Versioning, as configured
WOPI · HTTPS
Windows container
BoldDocServer
Document Editor Spreadsheet Editor PDF Viewer WOPI integration
ASP.NET Core · HTTPS
HTTPS
Nothing to install
Your users' browsers
- Open a file from SharePoint
- View or edit it in the browser
- Changes save back to the library
Open from SharePoint
A user opens a supported document from a SharePoint library. SharePoint launches BoldDocServer, which fetches the file through WOPI.
Work in the browser
The matching Syncfusion component, the Document Editor, Spreadsheet Editor or PDF Viewer, loads the file in the user's browser.
Save back to SharePoint
Changes are written back through WOPI, and SharePoint stores the updated document under the same permissions.
SharePoint keeps
- Document libraries and storage
- User permissions and repository access
- Document management and versioning
BoldDocServer provides
- Browser-based viewing and editing
- WOPI communication and write-back
- Collaboration capabilities where enabled
What your users can open
One server for Word, Excel and PDF
Users open Word, Excel and PDF files straight from their SharePoint library. Each format opens in a proven Syncfusion component in the browser, and edits are saved back to SharePoint.
PowerPointComing soonGet early access
Open Word documents from SharePoint, edit the content in the Syncfusion Document Editor and save changes back through WOPI.
Work with Excel workbooks in the Syncfusion Spreadsheet Editor, straight from the SharePoint workflow.
View PDFs stored in SharePoint in the Syncfusion PDF Viewer, with annotations and other review tools where enabled.
PowerPoint presentations: coming soon. Get early access
What your users can do
A complete document workflow in the browser
Once a file is open, the whole job happens in the browser. No desktop editing application is needed for the BoldDocServer workflow. Users need only a modern browser with JavaScript enabled that can reach the BoldDocServer HTTPS endpoint.
Available
Automatic save to SharePoint
Edits are written back to the original file through WOPI, so there's nothing to download or re-upload and no copies to manage.
By document type
Collaborative editing
- Multiple users can work on the same document
- Comments and replies
- Track changes with review, accept, and reject
Collaboration capabilities vary by document type and supported features.
Security and data control
Your documents stay in SharePoint, inside your network
That is why you kept SharePoint Server in the first place. BoldDocServer adds an editing layer without adding a new place where documents live.
Documents stay in SharePoint
BoldDocServer reads each file through WOPI and writes changes back to the same file. Libraries, permissions and versioning stay in SharePoint.
Runs inside your network
The Windows container runs on servers you manage, next to your SharePoint farm, so documents are processed in your own infrastructure.
HTTPS for every connection
HTTPS protects traffic between SharePoint, your users and BoldDocServer, including document content and WOPI requests.
Configuration you control
The SharePoint endpoint, certificates and secrets are supplied at deployment time. The same versioned image runs from test to production, and it can sit behind a reverse proxy.
Built by a SOC 2 and GDPR compliant company
BoldDocServer is developed by Syncfusion. Read about Syncfusion security.
Nothing to install for users
No desktop editing application is needed for the BoldDocServer workflow. Users need only a modern browser that can reach the BoldDocServer HTTPS endpoint.
Proven technology
The same Syncfusion components developers already trust
BoldDocServer runs on Syncfusion's Document Editor, Spreadsheet Editor and PDF Viewer, used in production by thousands of companies and backed by Syncfusion's enterprise support.
96
G2 badges for Syncfusion, Summer 2026
In their words
These real stories show the impact of the components behind BoldDocServer
BoldDocServer is built on Syncfusion’s DOCX Editor, Spreadsheet Editor and PDF Viewer SDKs. Here is what developers who use them say.
Getting started
Up and running in your own infrastructure
BoldDocServer runs as a Windows container on servers you manage, next to your SharePoint farm. Setup takes three steps, and your documents never leave your network.
1
Run the container
Deploy BoldDocServer from a versioned Docker image on Windows Server, inside the same network as your SharePoint farm.
2
Configure your environment
Supply the SharePoint endpoint, HTTPS certificates and secrets at deployment time. No code changes, and the same image works from test to production.
3
Connect SharePoint
Register BoldDocServer with SharePoint through WOPI. Supported files open in the browser right away.
What you need
- SharePoint Server 2016, 2019 or Subscription Edition
- Windows Server to run the BoldDocServer container, in the same network as your SharePoint farm
- An HTTPS certificate for the BoldDocServer endpoint
- Network access to that endpoint from SharePoint and from users' browsers
- Optional: a reverse proxy in front of BoldDocServer
Start your 30-day free trial
Run the container in your own environment, connect SharePoint and try BoldDocServer with your own documents for 30 days. The documentation walks you through each step.
Back to your three options
Office Online Server alternatives compared
The three options from the top of this page, side by side.
| Keep Office Online Server | Move to Microsoft 365 | BoldDocServer | |
|---|---|---|---|
| Supported after 2026 | No updates or fixes | Yes, by Microsoft | Yes, by Syncfusion |
| Keep your SharePoint Server farm | Yes | Requires migrating content | Yes |
| Documents processed inside your network | Yes | No, in Microsoft's cloud | Yes |
| Browser viewing and editing from SharePoint | Word, Excel, PowerPoint (unsupported after 2026) | Yes | DOCX and XLSX editing, PDF viewing |
Planning your move
Office Online Server replacement checklist
Six things to settle before December 31, 2026, whichever replacement you choose.
List what uses Office Online Server today
SharePoint Server is the usual one. Exchange Server and Skype for Business Server can use it too, so plan each workload.
Check your SharePoint version
BoldDocServer supports SharePoint Server 2016, 2019 and Subscription Edition.
List the formats people edit in the browser
Word and Excel editing and PDF viewing are available today. PowerPoint is coming soon.
Test with your own documents
Use a free trial to open your most complex files, such as templates, tracked changes and large workbooks, before you switch.
Plan certificates, network and the switch
The new editor needs an HTTPS endpoint that SharePoint and browsers can reach. Change the WOPI binding in a maintenance window, with a way back.
Compare licensing models
Per-user, per-connection and per-tab pricing give very different totals for the same farm. Model yours with real user counts.
Still deciding?
Frequently asked questions
Short answers about deployment, formats, pricing and the Office Online Server deadline.
What is BoldDocServer?
A server-side document solution that provides browser-based viewing and editing for DOCX, XLSX and PDF files stored in SharePoint Server. It's built on Syncfusion document components and integrates with SharePoint through WOPI.
What can replace Office Online Server for SharePoint Server?
There are three kinds of options: keep running Office Online Server without support after December 31, 2026; move your documents to Microsoft 365; or keep SharePoint Server and replace only the editing layer with a WOPI application such as BoldDocServer, Collabora Online, ONLYOFFICE Docs or ThinkFree.
Is BoldDocServer a drop-in replacement for Office Online Server?
For SharePoint Server, yes: BoldDocServer takes over browser viewing and editing through the same WOPI protocol. Office Online Server can also serve Exchange Server and Skype for Business Server. BoldDocServer is designed for SharePoint Server, so plan those workloads separately.
Does BoldDocServer replace SharePoint?
No. SharePoint remains your document repository and continues to handle libraries, storage, permissions and versioning. BoldDocServer provides the viewing and editing experience on top of it.
Where are my documents stored?
In SharePoint. BoldDocServer reads documents through WOPI and writes changes back to the same file, so content stays in your SharePoint libraries and inside your network.
Which document types are supported?
DOCX and XLSX for viewing and editing, and PDF for viewing, with annotations where enabled. Exact capabilities per format depend on the release; see the documentation for details.
Which SharePoint Server versions are supported?
BoldDocServer supports integration with SharePoint Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition through the WOPI protocol.
Does it save changes automatically?
Yes. Changes are saved back to SharePoint through the WOPI write-back workflow, so users don't need to download or re-upload files.
How much does BoldDocServer cost?
$3.50 per user per month, billed yearly, with graduated volume pricing from 100 users, down to $2.10 per user per month above 500 users. The minimum order is 25 users, and you can try it free for 30 days first. Use the calculator on the pricing page to see the exact cost for your team.
Does BoldDocServer support PowerPoint files?
Not yet. Viewing and editing PowerPoint presentations is coming soon. Today BoldDocServer edits Word and Excel files and displays PDFs.
How is BoldDocServer different from Collabora Online and ONLYOFFICE?
BoldDocServer runs as a Windows container next to your SharePoint farm, is built on Syncfusion’s Document Editor, Spreadsheet Editor and PDF Viewer, and publishes per-user prices for every team size. Collabora Online and ONLYOFFICE Docs edit more formats today, including PowerPoint.
Does it support collaborative editing?
Collaboration is part of the product, including multiple users on a document, comments, replies and track changes. Available capabilities vary by document type and release.
How is BoldDocServer deployed?
As a Windows container from a versioned Docker image, on Windows Server inside your own infrastructure. Environment settings such as the SharePoint endpoint, certificates and secrets are supplied at deployment time.
Is HTTPS required?
Yes, for production. HTTPS should protect all communication between SharePoint, users and BoldDocServer, including document content and WOPI requests.
Can it run behind a reverse proxy?
Yes. BoldDocServer can be deployed behind a reverse proxy where supported by the deployment architecture.
When does Office Online Server support end?
Microsoft has announced that Office Online Server retires on December 31, 2026. After that date it receives no security updates, bug fixes or technical support.
Try BoldDocServer free for 30 days
Keep SharePoint, give your users browser editing back, and be ready before Office Online Server support ends on December 31, 2026.
Part of the Bold product family from Syncfusion