Deepa Thiruppathy
TL;DR: Syncfusion’s Essential Studio 2025 Volume 4 release introduces powerful updates to the PDF Viewer and DOCX Editor SDKs, including permanent redaction, page organization and extraction, improved annotation collaboration, asynchronous document loading, smarter spell checking, and user-specific dictionaries. With new Visual Studio extensions for faster setup across web, Blazor, and .NET MAUI, this release helps developers build secure, responsive, and collaboration-ready document workflows.
Handling documents in modern applications often means dealing with sensitive data, large files, and collaborative workflows. Whether it’s redacting confidential information from a PDF or loading a large Word document without freezing the UI, developers need tools that are secure, fast, and easy to work with.
With the 2025 Volume 4 release, Syncfusion introduces several meaningful updates to the PDF Viewer SDK and DOCX Editor SDK, focused on security, performance, and developer productivity.
At a glance
- PDF Viewer SDK adds redaction, page organization, page extraction, and improved annotation commenting.
- DOCX Editor SDK introduces asynchronous document loading, smarter spell-checking, and user-specific custom dictionaries.
- A new Visual Studio Extension simplifies setup and speeds up integration for both SDKs.
- These updates are available across JavaScript, Angular, React, Vue, ASP.NET Core, MVC, Blazor, and .NET MAUI.
Let’s explore what’s new and how these features can make your document workflows simpler and more efficient.
PDF Viewer SDK: Stronger security and better page control
This release brings several practical improvements to the PDF Viewer SDK across web, Blazor, and .NET MAUI platforms.
Web PDF Viewers (JavaScript, React, Angular, Vue, ASP.NET Core, MVC)
Redaction
If you’re building web applications that handle sensitive PDFs, security is critical. The Web PDF Viewer now makes it easier to permanently remove confidential content before sharing documents.
Redaction allows you to permanently erase sensitive information instead of simply hiding it.
With this update, you can:
- Mark text, regions, or entire pages for redaction.
- Review and remove redaction marks before applying them.
- Permanently remove all marked content in a single action.
- Customize how redacted areas appear using overlay text, fonts, and colors.
- Add comments to redaction annotations for review and collaboration.
This is especially useful for enterprises handling legal documents, reports with personal data, or compliance-driven workflows.
Extract PDF pages
Working with large PDFs often means splitting them into smaller files. The Web PDF Viewer now supports page extraction, allowing you to:
- Extract selected pages into a new PDF.
- Save each page as an individual file.
- Optionally remove extracted pages from the original document.
This makes it easier to manage large documents without relying on external tools.
Blazor PDF Viewer: Page organization made simple
Managing PDF pages is now easier than ever with the new page organization feature for Blazor PDF Viewer users.
The page organization tools let you:
- Insert or delete pages at any position.
- Reorder pages using drag and drop, with multi-select support.
- Rotate pages to fix orientation issues.
- Copy and duplicate pages quickly.
- Import pages from another PDF.
- Select all pages to apply bulk operations in a single action, saving time on large documents.
- Save changes to the current document or use Save As to download a modified copy for later use.
- Undo or redo page changes before saving.
Enterprises can reorganize large reports or proposals without leaving the application, improving efficiency and reducing dependency on third-party tools.
.NET MAUI PDF Viewer: Redaction and annotation comments
The .NET MAUI PDF Viewer receives updates focused on security and collaboration, making it ideal for mobile and desktop applications.
Redaction support
You can now build MAUI apps that safely handle sensitive documents by:
- Marking text, regions, or pages for redaction.
- Customizing the appearance of redacted areas.
- Permanently removing confidential content before sharing files.
This is useful for sanitizing reports, invoices, or other documents that contain personal information.
Annotation comments list
Collaboration is easier with the new annotation comments list:
- Add, edit, reply to, or delete threaded comments.
- Navigate quickly between annotations in the document.
- View comments grouped by page, along with author names and timestamps.
This makes document reviews clearer and more organized, especially for team-based workflows.
Let’s now move on to the DOCX Editor SDK updates.
DOCX Editor SDK: Faster loading and smarter spell-check
The DOCX Editor SDK introduces updates that focus on performance and personalization for both web and Blazor applications.
Web and Blazor DOCX Editors: Performance and personalization
Asynchronous document loading
This feature enables documents to load asynchronously without blocking the user interface, allowing users to interact with other parts of the web page while the document is loading. When the document is loaded, the progress indicator will be displayed, and users can perform other tasks. It unblocks the main thread during network latency, improving overall application responsiveness.
Ignore uppercase words in spell check
This enhancement to the spell check module enables users to skip spell checking for uppercase words within the document. Acronyms can be prevented from being flagged as spelling errors.
User-specific custom dictionaries
Each user can now maintain a personal dictionary:
- Custom terms (such as names or internal codes) are recognized correctly.
- One user’s dictionary doesn’t affect others.
- Spell-check behavior feels more natural and personalized.
Visual Studio Extension: Faster setup for PDF Viewer and DOCX Editor PDF Viewer SDK Extension
PDF Viewer SDK Extension
The PDF Viewer SDK Extension for Visual Studio is designed to simplify the process of adding and configuring PDF Viewer features in your applications. Instead of setting everything up manually, the extension helps you get started quickly across multiple platforms, including Blazor, .NET MAUI, WPF, and WinForms.
With this extension, you get:
- Blazor code generator: Automatically inserts PDF Viewer component code directly into Razor files, saving you time and reducing manual setup.
- WPF and WinForms item templates: Quickly add PDF Viewer components to existing desktop projects using ready-made templates.
- Reference manager: Easily add all required PDF Viewer SDK assemblies to your project without worrying about missing dependencies.
- .NET MAUI toolbox support: Drag and drop PDF Viewer components into XAML files, with required namespaces and NuGet packages added automatically.
Together, these features help you integrate PDF viewing and editing capabilities into your applications faster and with fewer configuration steps.
DOCX Editor SDK Extension
The DOCX Editor SDK Extension for Visual Studio makes it easier to build applications that create, edit, and manage Word documents, eliminating the need for external tools like Microsoft Word.
This extension provides:
- Ready-to-use project templates: Start new Blazor or WPF projects with DOCX Editor components already configured.
- Blazor code generator: Insert DOCX Editor SDK components directly into Razor files with just a few clicks.
- WPF item templates: Quickly integrate DOCX editing functionality into existing WPF applications.
- Reference manager: Simplify project setup by automatically adding the required DOCX Editor SDK assemblies.
By reducing boilerplate code and automating setup tasks, these extensions enable developers to focus more on building features and less on configuration, resulting in faster and more productive document development.
Conclusion
The 2025 Volume 4 brings meaningful improvements to Syncfusion’s PDF Viewer and DOCX Editor SDKs, focusing on what developers care about most, security, performance, and ease of use.
From permanent redaction and page organization in PDFs to faster document loading and smarter spell-checking in Word editors, these updates are designed to simplify document workflows and improve the overall developer experience.
Explore all the latest features in the 2025 Volume 4 Release Notes and What’s New pages. Existing users can download the latest version from the license and downloads, while new users can start with a 30-day free trial to experience everything firsthand.
Have questions or need help? Reach out through our support forum, support portal, or feedback portal. We are here to help.
No spam, just valuable updates.