What’s New in Document Editors and Viewers – 2025 Volume 3

Modular SDKs: Build only what you need

Developers building document-heavy applications often face challenges like bloated SDKs, sluggish performance, and limited customization. With the 2025 Volume 3 release, Syncfusion^® tackles these issues head-on by introducing modular SDKs for the PDF Viewer, DOCX Editor, and Spreadsheet Editor.

This modular approach allows developers to integrate only the components they need, reducing app size, boosting load times, and simplifying maintenance. It empowers teams to build faster, smarter, and more secure document-centric apps across web, desktop, and mobile platforms.

PDF Viewer SDK

Here’s a breakdown of the key enhancements in the PDF Viewer SDK.

Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)

Angle constraints for line annotations

Users can now draw precise line annotations with angle constraints by holding the Shift key. By default, lines snap to 45° angles, and this behavior can be customized to suit specific annotation needs.

Blazor PDF Viewer

Revamped navigation toolbar

The redesigned navigation toolbar offers a cleaner, more intuitive UI, improves usability, and supports custom containers for extended functionality.

Performance boosts

Faster printing: Large documents now print up to 8x faster, with consistent output even for rotated or annotated files.

The new Blazor AI-powered PDF Viewer

We’re excited to introduce a brand-new component, AI-Powered Blazor PDF Viewer. This smart viewer enhances the traditional PDF experience with built-in artificial intelligence, making document interaction faster, smarter, and more intuitive.

It retains all the robust core features you expect, such as rendering PDFs from byte arrays, streams, or file paths, along with support for printing, annotations, bookmarks, and thumbnails. But now, it goes even further with next-generation capabilities like:

• Document Summarization
  Quickly generate concise overviews of lengthy PDFs. Users can ask questions or choose from AI-generated suggestions to locate key information faster.

• Smart Redact
  Automatically detects and removes sensitive content like emails or names. Users can review and fine-tune redaction suggestions before finalizing.
• Smart Fill
  Uses context-aware AI to suggest and auto-fill missing form data, reducing manual effort while allowing users to review and adjust the results.

.NET MAUI PDF Viewer

Windows-specific printing enhancements

In this release, we’ve introduced five print quality levels: Low, Default, Medium, High, and Ultra. These levels are ideal for everything from quick drafts to detailed CAD drawings.

• Default printing quality uses the previous version’s output quality.
• Low quality optimizes print speed and uses minimal memory during printing.
• Medium quality balances clarity and performance during printing.
• High quality ensures sharper lines and crisp, small annotations in the output.
• Ultra quality optimizes the detail on large-format print documents like CAD drawings and architectural plans.

Performance improvements

Document loading is now significantly faster across all platforms:

Document type	Android improvement (%)	iOS improvement (%)	macOS improvement (%)	Windows improvement (%)
Small page count PDF loading time (≤ 10 pages)	55.4	21.5	9.8	46.3
Medium page count PDF loading time (50-100 pages)	20.3	5.5	14.1	51.4
Large page count PDF loading time (> 1,000 pages)	28.9	1.9	30.1	30.1
Large page dimension PDF loading time (> A3 size)	4.5	44.1	69.8	67
Large file size PDF loading time (> 150 MB)	30.3	21.2	40.5	24.7
PDF with heavy text content loading time	74.1	49.5	38.7	82.6
PDF with more annotations loading time (1,000+ items)	17.7	16.5	72.2	42.5

DOCX Editor SDK

Let’s take a look at a few highlights in the DOCX Editor SDK.

Web DOCX Editor (JavaScript, Angular, React, Vue, ASP.NET Core, & MVC)

Retrieve revision content

The DOCX Editor allows you to extract tracked changes as HTML content, making it ideal for building custom review interfaces or displaying revision history outside the editor.

Intercept paste events

The DOCX Editor now gives developers control over how content is handled before it’s pasted into the document. This allows them to inspect the type and source of the content, such as plain text or SFDT, and apply custom logic accordingly. It’s especially useful for enforcing formatting rules, blocking unwanted content, or distinguishing between internal and external paste actions.

Custom metadata for revisions

The DOCX Editor now supports adding custom metadata to tracked changes. This metadata can be displayed alongside the author’s name in the Track Changes pane, enhancing collaboration, transparency, and audit trails during document reviews.

Spreadsheet Editor SDK

Let’s check out a few enhancements in the Spreadsheet Editor SDK.

Web Spreadsheet Editor (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)

Skip unused properties during Excel import

Skipping unused properties during Excel import helps improve performance by reducing JSON size and speeding up rendering, especially for large or complex spreadsheets.

Date interpolation in charts

This support improves performance by reducing JSON size and speeding up rendering, especially for large or complex Excel files.

Date interpolation in charts

This feature enables smoother transitions and accurate visualizations for date-based data, aligning with Microsoft Excel’s behavior.

Apply cell styles to discontinuous ranges

Users can now format non-contiguous cell ranges, just like Excel.

Aggregate calculation for discontinuous ranges

You can view SUM, AVERAGE, COUNT, MIN, and MAX directly in the sheet tab for selected non-contiguous cells, streamlining quick data analysis.

Conclusion

Thanks for reading! The 2025 Volume 3 release of Syncfusion’s Document Editors and Viewers SDK marks a major leap forward. With Modular SDKs, AI-powered tools, and performance enhancements, developers have the flexibility and power to build highly efficient, secure, and intelligent document applications.

To learn more, check out the complete list of new features and components in the 2025 Volume 3 release on our Release Notes and What’s New pages.

If you’re already a Syncfusion^® user, you can download the latest version of Essential Studio^® from the license and downloads page. We offer our new users a 30-day free trial to explore all our components’ features and capabilities.

If you need further assistance, contact us via our support forums, support portal, or feedback portal. We’re always here to help you!