View and edit
Word documents
.docx · Document Editor
- Formatting, tables and images kept
- Comments and track changes
- Saved back to the same file
Microsoft support for Office Online Server ends December 31, 2026.
Keep SharePoint.
Replace Office Online Server.
BoldDocServer replaces Office Online Server for organizations that run SharePoint Server. Users open Word, Excel and PDF files from their libraries in the browser, edit and save back to the same file, and every document stays inside your network.
- Self-hosted in your network
- SharePoint permissions on every file
- Free 30-day trial
Built by Syncfusion
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
Deployment
A Linux container you run next to SharePoint Server, behind your own reverse proxy or load balancer.
Deployment and requirementsSecurity
Documents stay in SharePoint. Each session uses a token SharePoint issues for one user and one file, over HTTPS.
Security and data controlLicensing at scale
Per end-user subscription, billed yearly. Rates fall from 100 end-users, to $2.10 a month from 501.
Pricing and volume rates
What changes on December 31, 2026
Office Online Server is retiring. Browser editing doesn’t have to.
Without a replacement, SharePoint Server users go back to download, edit, upload. You have three ways forward.
—days left
until Microsoft stops security updates, fixes and support for Office Online Server.
Microsoft's announcement ↗- Option 1
Keep Office Online Server
It keeps running, but with no security updates or fixes after 2026.
Unsupported - Option 2
Move to Microsoft 365
A cloud migration of your documents, sites and permissions.
Large project - Option 3
Replace only the editor
Keep SharePoint Server, your libraries and your permissions. Add BoldDocServer.
RecommendedSee how it works
How it works with SharePoint
SharePoint stores the document. BoldDocServer edits it.
When someone opens a file, SharePoint launches BoldDocServer through WOPI. SharePoint keeps the files and permissions; BoldDocServer provides the editor in the browser.
Step 3 of 3 · Save back to SharePoint: Version 4.0 is stored in the library
What your users can open
One server for Word, Excel and PDF
Users open files straight from their SharePoint library. Each format opens in its own Syncfusion component in the browser, and Word and Excel changes are saved back through WOPI.
View and edit
Excel workbooks
.xlsx · Spreadsheet Editor
- Formulas, sorting and filtering
- Charts and conditional formatting
- Saved back to the same file
View and review
PDF files
.pdf · PDF Viewer
- Thumbnails, search and zoom
- Annotations, where enabled
- Form filling, where enabled
Coming soon
PowerPoint
.pptx · next in line
Viewing and editing presentations from SharePoint is coming next. Ask for early access to try it first.
Get early access
Browser editing and collaboration
Edit, review and save without leaving the browser
Users edit Word and Excel files and review PDFs in the browser. When collaboration is enabled, several people can work on one document, leave comments and accept or reject tracked changes.
- Word (DOCX) and Excel (XLSX) editing
- PDF viewing and annotation, using supported tools
- Comments, replies and track changes, when collaboration is enabled
Save back to SharePoint
Every change saves back to the same file
BoldDocServer writes supported changes to the original file through WOPI. SharePoint adds the new version to the file’s history, so there are no downloaded copies to reconcile.
- Saved to the same file, not a copy
- Version history kept by SharePoint, per your library settings
- The user’s SharePoint permissions apply to every save
Enterprise
Your documents stay in SharePoint, inside your network
BoldDocServer adds browser editing without adding a new place for documents to live. Every request passes the controls you already run.
- Self-hostedA Docker container on a host you manage, next to your SharePoint farm.
- Encrypted connectionsHTTPS between SharePoint, BoldDocServer and the browser, with your certificates.
- SharePoint permissionsSharePoint decides who can open and edit each file, as it does today.
- One user, one fileEach session uses an access token that SharePoint issues for one user and one file.
Valid: Maria can edit Q3-budget.xlsx, and only that file
Developed by Syncfusion, a SOC 2 and GDPR compliant company. Syncfusion security
Deployment and operations
Runs where your SharePoint farm runs
One Linux container on a host you manage, next to SharePoint Server. Your team keeps control of the network, the certificates and the release schedule.
One container image
BoldDocServer ships as a versioned Docker image for Linux. The same tested image moves from test to staging to production.
Your network, your certificates
It serves HTTPS with your own certificate, behind the reverse proxy or load balancer you already run.
A binding change, not a migration
SharePoint is pointed at BoldDocServer with a WOPI binding. Libraries and documents stay where they are, and you keep a way back.
Documented end to end
Requirements, installation and the SharePoint connection are documented step by step for your administrators.
Rollout and support
From a 30-day pilot to every user
Prove it on your own farm before you buy, then roll it out on your schedule. Documentation covers every step, and Syncfusion support and sales are there when you need a person.
- 1
Pilot
Start the 30-day trial with the full product on a SharePoint test farm, using your own documents.
- 2
Review
Take it through your security review. The security page answers the questions security teams usually ask.
- 3
Roll out
Change the production binding in a maintenance window and license the end-users who need it.
Still deciding?
Frequently asked questions
Short answers about deployment, formats and pricing. More answers are on the pricing and How it works pages.
What is BoldDocServer?
BoldDocServer is a self-hosted document solution from Syncfusion that provides browser-based viewing, editing, and collaborative editing for Word (DOCX), Excel (XLSX), and PDF documents integrated with SharePoint Server 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-based solution such as BoldDocServer, which provides browser-based viewing, editing, and collaboration while SharePoint remains your document repository.
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.
Which document types are supported?
BoldDocServer supports Word (DOCX) and Excel (XLSX) viewing and editing, and PDF viewing, review, and supported editing and annotation operations. Collaborative editing is available for supported document types.
How much does BoldDocServer cost?
$3.50 per end-user per month, billed yearly as a company subscription, with graduated volume pricing from 100 users, down to $2.10 per user per month above 500 users. The minimum is 25 end-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.
How is BoldDocServer deployed?
BoldDocServer is deployed as a container using a supported, versioned Docker image in your infrastructure. Configure the application URL, SharePoint endpoint, HTTPS, license, and required secrets according to the deployment documentation.
Free for 30 days
Keep SharePoint. Bring browser editing back.
Deploy BoldDocServer in your own network, connect a SharePoint test farm and open your first document, well before Office Online Server support ends on December 31, 2026.
- Free 30-day license
- Self-hosted Docker image
- Published pricing
Ready: your users edit SharePoint documents in the browser