Syncfusion Essential Studio PDF Viewer SDK Releases

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Version 2026 Volume 2 (34.1.33) (Jul 28, 2026)

Learn what's new across releases, with details of features, enhancements, and resolved issues.

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Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 2 (34.1.31)Jul 14, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where text search highlights were not cleared properly and reappeared during zoom operations when enableThumbnail was set to false.
    • Fixed a script error that occurred when performing text search programmatically without the Toolbar module.
  • Blazor PDF Viewer
    • Fixed an issue where border thickness in FreeTextSettings is not applied correctly to free text annotations in specific scenarios.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 2 (34.1.30)Jul 9, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where button fields were not rendered in the Standalone PDF Viewer without the form designer module.
    • Fixed an issue where duplicate annotations were rendered in the customer provided document without form designer module.
    • Fixed an issue where form field values were not positioned correctly during printing in server rendering mode for the provided document.
    • Resolved an issue where ink annotations were not rendered properly after being added as a dot and saved in the PDF document.
    • Resolved screen reader and keyboard accessibility issues in the PDF Viewer.
    • Resolved an issue where bounds were not updated correctly in the UI after fields were updated programmatically.
    • Resolved an issue where the context menu flickered when the comment panel was open on Ubuntu OS devices.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 2 (34.1.29)Major versionJul 6, 2026
Features
  • Web PDF Viewer
    • Erase ink annotations - The PDF Viewer supports an ink eraser tool, allowing users to remove portions of ink annotations. The tool is available contextually when working with ink and can also be enabled programmatically.
    • Filter annotation comments - A new filtering option in the comments panel allows users to narrow down annotations based on specific criteria. For improved context, filtered results can also be visually indicated within the document, making it easier to focus on relevant annotations during review.
    • Improved annotation download - Significant improvements have been made to annotation processing during document downloads. Performance has increased by up to 92% for documents with more than 30 annotations and by around 35% for smaller documents. This provides quicker downloads and a more responsive experience when working with annotated PDFs.
  • Blazor PDF Viewer
    • View formatted bookmark text - Added support for rendering bookmark text in view-only mode with the formatting styles defined in the source document. Bookmarks are displayed exactly as authored, preserving their original styling and structure while improving readability and navigation.
  • .NET MAUI PDF Viewer
    • Control double-tap zoom behavior - Developers can enable or disable double-tap zoom functionality in the PDF Viewer. This provides greater control over user interactions, especially in applications with custom gesture handling or restricted zoom scenarios.
    • Set all PDF form fields to read-only - The PDF Viewer provides an option to mark all form fields as read-only with a single setting. This is useful in scenarios such as document reviews or when displaying finalized forms, ensuring data integrity by preventing unintended modifications.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 SP1 (33.2.15)Jun 23, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where the Organize PDF dialog did not close after organizing large PDF documents.
    • Fixed a script error that occurred when updating the isAnnotationToolbarVisible API before the document was loaded.
    • Resolved an issue where a script error occurred when saving the PDF document after deleting a signature from the Signature Field.
    • Fixed an issue where the hyperlink position was incorrect for rotated documents.
  • Blazor PDF Viewer
    • Fixed an issue where GetDocumentAsync API returns null after NavigationLock is used to prevent the navigation.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 SP1 (33.2.13)Jun 16, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where the distance annotation leader length was incorrect during printing and downloading.
    • Fixed a script error that occurred when adding the redaction annotation when the enableFormDesigner is set to false.
    • Resolved an issue where the stamp annotations were not rendered when the enableMagnification is set to false.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 SP1 (33.2.12)Jun 9, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved the issue where the undo functionality was not working properly for comment status changes.
  • Blazor PDF Viewer
    • Fixed an issue of PDF thumbnails not loaded when invoking OpenThumbnailPaneAsync API initially.
  • .NET MAUI PDF Viewer
    • The memory leak issue is no longer observed when repeatedly opening and closing PDF documents in the PDF Viewer.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 SP1 (33.2.10)Jun 2, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved UI issues in annotation toolbar items in mobile rendering mode.
    • Resolved a permissions policy violation caused by the deprecated unload event listener.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 SP1 (33.2.8)May 26, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Fixed a script error that occurred when repeatedly focusing on form fields programmatically.
    • Resolved the issue where grouped radio buttons and checkboxes were not working in server-side rendering mode without the Form Designer module.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 SP1 (33.2.7)May 19, 2026
Features
  • .NET MAUI PDF Viewer
    • Combo box selections in the .NET MAUI PDF Viewer on Android and iOS are now applied instantly without requiring confirmation buttons, improving the form-filling experience.
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Fixed an issue where the ListBox selectedIndex and export values were not set correctly when the Form Designer module was not injected.
    • Fixed an issue where FreeText annotation text alignment was not preserved correctly after programmatic editing.
    • Fixed an issue where the text search loading spinner did not stop when searching for non-existent text and clicking the Next button.
    • Fixed an issue where the findText method did not work properly when the searched text appeared in both single-line and multi-line.
  • .NET MAUI PDF Viewer
    • The added typed signature in the .NET MAUI PDF Viewer now displays fully when resized to different sizes, resolving the issue where it was previously only partially visible at certain dimensions.
    • Navigation to pages containing a large number of link annotations no longer causes freezing in the MAUI PDF Viewer.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 SP1 (33.2.6)May 12, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where text selection was incorrectly enabled in Pan mode during touch interaction.
  • .NET MAUI PDF Viewer
    • PDF search result highlighting in the .NET MAUI PDF Viewer now displays correctly when pages are rendered using OverscanCount.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 SP1 (33.2.4)Apr 28, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where the showToolbarItem method did not work for custom toolbar items.
    • Fixed an issue where the area annotation label was not displayed after exporting and importing a document in the PDF Viewer.
    • Fixed an issue where the findText method did not work properly with a customer provided document.
    • Fixed an exception that occurred while downloading a document containing a straight line ink annotation.
    • Fixed an issue where form field names with underscores were not set properly when the Form Designer module was disabled.
    • Fixed an issue where the ink annotation was not completed properly when selecting a text markup tool while ink mode was active.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 (33.1.49)Apr 14, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core and MVC)
    • Fixed an issue where the updateFormFieldsValue method did not update the Radio Button in the UI when the Form Designer module was not injected.
    • Fixed an issue where List Box options were not displayed correctly when the Form Designer module was not injected.
    • Fixed an issue where the findText method did not work for a customer-provided document.
    • Resolved an issue where the form field tab order did not work in rotated documents in server-rendering mode.
  • .NET MAUI PDF Viewer
    • Ink annotations now maintain correct scaling during zoom operations in Single Page mode in the MAUI PDF Viewer.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 (33.1.47)Apr 7, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Fixed an issue where the List Box font color was not retained in the print preview and the downloaded PDF documents.
    • The findTextAsync method now works in server side rendering mode before the extractTextCompleted event is triggered.
    • Fixed an issue where changes to handwritten signature opacity were not applied correctly when adjusting opacity and interacting with the PDF page.
    • Resolved a script error that occurred while redacting the customer provided document.
  • Blazor PDF Viewer
    • Implemented support to display bookmark styling attributes, including font color and font style, only during rendering in the PDF Viewer.
    • Resolved the newline handling issue encountered when editing FreeText annotations programmatically in the PDF Viewer document loaded event.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 (33.1.46)Mar 31, 2026
Fixes
  • Web PDF Viewer (Javascript, Angular, React, Vue, ASP.NET Core & MVC)
    • Fixed an issue where the browser default print dialog appeared even when enablePrint was set to false while the PDF Viewer was in focus.
    • Resolved an exception that occurred when printing a PDF in Microsoft Edge with the AlwaysOpenPdfExternally policy enabled.
    • Fixed an issue where Free Text annotation bounds were incorrectly exported after updating bounds using the editAnnotation method.
    • Resolved an issue where the findText method returned incorrect bound values for PDF documents that contain CropBox and MediaBox values.
    • Fixed an issue where annotations were not rendered in Standalone rendering mode for the customer provided PDF document.
  • WPF PDF Viewer
    • InvalidCastException will no longer be thrown while clicking Custom stamp menu.
    • Incorrect page deletion will no longer occur in Organize page.
    • Improved memory optimization while adding and removing annotation programmatically.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 (33.1.45)Mar 24, 2026
Fixes
  • Blazor PDF Viewer
    • Resolved an issue where localization was incorrectly updated when using the IsThumbnailPanelOpen API to open the thumbnail panel.
    • Resolved an issue where the mouse cursor was incorrectly updated when attempting to add a custom stamp in Blazor WebAssembly.
    • Resolved an issue where the mouse cursor was incorrectly updated when attempting to add a custom stamp in a custom toolbar in Blazor WebAssembly.
    • Resolved an exception that occurred during multiple refresh operations in the Web Apps sample using WebAssembly.
    • Resolved an issue by positioning the text search highlight behind the text to enhance readability and clarity.
    • Resolved an issue where the text search highlight did not appear for OCR-processed PDF documents.
    • Resolved an issue where an exception was thrown when navigating away from the page and disposing of the PDF Viewer.
Syncfusion Essential Studio PDF Viewer SDK 2026 Volume 1 (33.1.44)Major versionMar 16, 2026
Features
  • Common
    • Production-ready component - The Blazor Smart PDF Viewer components have been enhanced to meet industry standards and are production-ready.
      • Document summarizer: Provides AI-generated summaries and answers to user queries, enabling quick understanding of document content.
      • Smart redaction: Automatically detects and redacts sensitive information automatically, ensuring accurate and secure content protection.
      • Smart fill: Automatically identifies and fills PDF form fields using AI, minimizing manual input and speeding up form completion.
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core, MVC)
    • Significant performance improvements in organizing pages - The Organize Pages window now opens and closes far more quickly, eliminating lag and UI freezes when working with medium to extremely large PDF documents. Users get a smoother, more responsive page-management experience.
  • Blazor PDF Viewer
    • Significant performance improvements in text search - The Blazor PDF Viewer now provides a dramatically faster and more reliable text-search experience thanks to targeted engine optimizations and refined indexing. Users can locate words in PDFs much faster and with consistent accuracy, even in very large files.
  • .NET MAUI PDF Viewer
    • Maintain zoom level in single page view mode - A new capability has been introduced that allows the PDF Viewer to retain the current zoom level when navigating between pages in single page view mode. When enabled, the viewer preserves the user-defined zoom level instead of resetting it on each page transition. This ensures a consistent viewing experience, particularly when working with documents that contain detailed graphics, small text, or zoom-critical content.
    • Access custom stamp annotation views - Users can now retrieve visual elements associated with custom stamp annotations. Accessing these elements provides greater flexibility in customizing and managing stamp behavior after they are added to a page, making it particularly valuable when integrating stamps into advanced review or approval workflows. Developers can now retrieve, modify, or dynamically update the appearance and behavior of custom stamps once they are placed in the document, enabling more interactive and adaptable annotation scenarios.
  • Visual Studio Code Extension
    • Syncfusion PDF Viewer SDK Extension - Visual Studio Code - The PDF Viewer SDK Extension for Visual Studio Code allows developers to integrate Syncfusion PDF Viewer components into Blazor and .NET MAUI apps. It provides dedicated project templates for both platforms, plus convenient code snippets: Blazor snippets insert component code straight into Razor files, while MAUI snippets add it directly to XAML files.
Syncfusion Essential Studio PDF Viewer SDK 2025 Volume 4 SP1 (32.2.9)Mar 10, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Fixed an issue where grouped radio buttons did not update their selected state correctly during interaction.
    • Resolved a script error that occurred when annotation comments were edited programmatically after the annotation was locked.
    • Fixed an issue where the Angular Material Dialog was not properly disposed after closing when the PDF Viewer was used inside it.
    • Resolved an issue where exportAsImages returned empty or invalid image data when exporting after loading a second password-protected document.
  • .NET MAUI PDF Viewer
    • The Undo icon now functions correctly when annotations are imported.
    • The creation timestamp of imported annotations is now retained after opening the comments panel.
  • WPF PDF Viewer
    • Signature field tooltip now appeared properly in WPF PDF Viewer.
Syncfusion Essential Studio PDF Viewer SDK 2025 Volume 4 SP1 (32.2.8)Mar 3, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Fixed an issue where textboxes did not receive focus in touch mode when a custom class and tooltip were used.
    • Fixed accessibility issues in the EJ2 PDF Viewer.
    • Fixed an issue where the viewer failed to load a new document after opening a corrupted PDF document.
  • .NET MAUI PDF Viewer
    • Annotation selection now works consistently at FitToPage zoom mode and low zoom levels on the android platform.
    • FormFieldValueChanged event now behaves consistently across iOS and Android platforms.
    • PDF Viewer no longer encounters crashes when handling print or save operations on PDFs that contain very small ink annotations.
Syncfusion Essential Studio PDF Viewer SDK 2025 Volume 4 SP1 (32.2.7)Feb 24, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Fixed a script error that occurred on mobile devices when dynamically updating the component height with enableToolbar set to false.
    • Resolved an issue where the Add Reply option appeared twice in the Comment Panel when isCommentLock was set to true.
    • Fixed an issue where importing annotations failed when using older format JSON data for sticky note annotations.
  • .NET MAUI PDF Viewer
    • Link annotations now navigate to the intended destination page in the specific PDF that uses overlapping link annotations.
    • Duplicate signatures are no longer displayed in the PDF after multiple save and reload operations.
  • WPF PDF Viewer
    • NullReferenceException will no longer occur while performing the text search in WPF PDF Viewer.
Syncfusion Essential Studio PDF Viewer SDK 2025 Volume 4 SP1 (32.2.5)Feb 17, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where the free text annotation was not rendering similar to Adobe PDF Viewer.
    • Resolved an issue where opacity was not applied properly for free text when setting through the freeTextSettings API in edit mode.
    • Resolved an issue where the free text annotation position changed in the downloaded PDF when opened in other viewers.
    • Resolved an issue where the free text annotation height increased when typing at zoom levels below 100%.
    • Resolved an issue where the size of existing free text annotations changed while editing.
    • Resolved an issue where the selected state of the Ink annotation tool was not removed when selecting the free text tool.
    • Resolved an issue where measurement settings were not applied to calibration annotations that were added programmatically.
    • Fixed an issue where both strikethrough and underline were not applied to free text annotations.
    • Fixed an issue where the primary toolbar was hidden on PDF click after updating the viewer container while the annotation toolbar was open.
Syncfusion Essential Studio PDF Viewer SDK 2025 Volume 4 SP1 (32.2.4)Feb 11, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where the free text color property was not displayed correctly in the color picker after editing the annotation in the Adobe PDF Viewer.
    • Resolved an issue where the custom font family was not applied correctly for free text when set through the freeTextSettings API.
    • Resolved an issue where alignment was not applied correctly for free text when set through the freeTextSettings API.
  • .NET MAUI PDF Viewer
    • Edit icon in the sticky note dialog is now disabled when a sticky note is locked.
  • WPF PDF Viewer
    • Annotations missing when importing annotation data will no longer occur in WPF PDF Viewer.
Syncfusion Essential Studio PDF Viewer SDK 2025 Volume 4 SP1 (32.2.3)Feb 5, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where the text selection position was not proper in the customer provided PDF document.
    • Resolved an issue where the selected annotation did not appear in the viewport at higher zoom levels in the customer provided PDF document.
  • Blazor PDF Viewer
    • Resolved an exception that occurred when disposing the PDF Viewer component dynamically through a button click.
    • Resolved an issue that occurred when pinch zooming the pages in the PDF Viewer component in the iPad device.
  • .NET MAUI PDF Viewer
    • The PDF now displays with proper alignment according to the zoom mode settings when reloaded in the first PDF viewer of the split-view Viewers on iOS platform.
Syncfusion Essential Studio PDF Viewer SDK 2025 Volume 4 (32.1.25)Jan 27, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Fixed an issue where annotations and comments were missing in a customer provided document due to a duplicate annotation name.
    • Fixed an issue where form field content was not fully visible when the enableFormDesigner API was set to false.
  • .NET MAUI PDF Viewer
    • Localization is now working correctly for tooltips on the Windows platform.
Syncfusion Essential Studio PDF Viewer SDK 2025 Volume 4 (32.1.24)Jan 20, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Fixed an issue where the Free Text annotation moved outside the PDF page when using a large font size and resizing or dragging it beyond the page boundaries.
    • Fixed an issue that caused difficulties in resizing the newly added Calibrate Area annotation when the enableShapeLabel API was set to true.
  • WPF PDF Viewer
    • Null Exception will no longer occur when clicking the layers option in WPF Pdfviewer.
Syncfusion Essential Studio PDF Viewer SDK 2025 Volume 4 (32.1.23)Jan 13, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where the print preview was not displayed for password-protected documents in the standalone PDF Viewer.
    • Fixed an issue where bounds in the annotationCollection deviated when adding a free text annotation using the addAnnotation method.
    • Fixed an issue where free text positions were misaligned when importing annotations as XFDF file.
    • Resolved an issue where Free Text Justify was not working properly when the right side had extra space.
Syncfusion Essential Studio PDF Viewer SDK 2025 Volume 4 (32.1.22)Jan 6, 2026
Fixes
  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where the 'No matches found' popup appeared when searching the text using enter key after rapid input.
    • Fixed an issue where programmatically importing annotations as XFDF was not working properly.
    • Fixed an issue where less-than and greater-than characters were converted to HTML entities in Free Text annotations and the comment panel.
  • WPF PDF Viewer
    • Text selection for a single character is now properly performed in WPF Pdfviewer.