This is the result with R3 2022:

 

 

This is the result with R2 2023 SP1:

 

Use the attached pdf document and launch the PdfPrintPreviewDialog. As it is demonstrated in the gif file, the preview dialog moves the pages slower than the pdf viewer itself.

Expected behavior: the performance for navigating the pages should be at least identical.

A password is asked although adobe opens the document without one

Provide a new property that specifies FileName in SaveAs command.

When RadPdfViewer is in text selection mode and the user is trying to select a word by double-clicking on it, the last letter of the word is not selected when the word is followed by some symbols like '.', ':', '(', '...'

Also, the CaretPosition is not correct.

The problem I'm trying to solve is that users do not know that the original document may not be what they are seeing in the viewer when there are layers.    

A property that indicates that a document has layers would allow the system to refuse to open the document.

A pop-up annotation displays text in a pop-up window for entry and editing. It typically does not appear alone but is associated with a markup annotation (its parent annotation) and is used for editing the parent’s text.

Open the Demo app and load the PDF document with such annotation. The following error occurs:

************** Exception Text **************
System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at Telerik.Windows.Documents.Fixed.Utilities.Rendering.Annotations.DefaultAppearanceProvider.TryGetCurrentAnnotationAppearances(Annotation annotation, SingleStateAppearances& singleStateAppearances)
   at Telerik.Windows.Documents.Fixed.Utilities.Rendering.Annotations.DefaultAppearanceProvider.TryProvideAppearanceOverride(Annotation annotation, AnnotationAppearanceMode annotationAppearanceMode, FormSource& formSource)
   at Telerik.Windows.Documents.Fixed.Utilities.Rendering.Annotations.BaseAppearanceProvider.TryProvideAppearance(Annotation annotation, AnnotationAppearanceMode annotationAppearanceMode, FormSource& appearance)
   at Telerik.Windows.Documents.Fixed.Utilities.Rendering.Annotations.BaseAppearanceProvider.TryProvideAppearance(Annotation annotation, AnnotationAppearanceMode annotationAppearanceMode, FormSource& appearance)
   at Telerik.WinControls.PdfViewer.FixedPageRenderer.DrawPage(RadFixedPage page, Graphics graphics)
   at Telerik.WinControls.UI.FixedPagePreRenderer.rendererWorker_DoWork(Object sender, DoWorkEventArgs e)
   at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
   at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)

Currently, RadPdfViewer offers the DataError event which is purposed to handle errors during the import process. However, if there are problematic pages that are rendered in the viewer at a later moment after the document is already imported, the viewer doesn't offer a suitable way for handling such problematic moments even though the PdfProcessing library throws one of its exceptions. 

The exact client's case is loading a PDF document which contains images requiring JPX Decoder which is currently not supported. Even though the PdfProcessing library throws internally the following error, the RadPdfViewer control doesn't throw the DataError event with the respective error:

Telerik.Windows.Documents.Fixed.Exceptions.NotSupportedFilterException: 'JPXDecode is not supported.'

 

For example, if you choose to print second page like this: 

It prints only the first page of the document, instead of the second page.

Overview

This repository documents a bug found in the Telerik PDF Viewer control for Windows Forms. The issue specifically affects the rendering of SVG graphics embedded in PDF files, where the stroke-width attribute is ignored by the viewer.

Affected Component

• Product: Telerik UI for WinForms
• Control: `RadPdfViewer'
• Version: 2025.01
• Platform: Windows Forms (.NET Framework)

Description of the Issue

When a PDF file contains an embedded SVG graphic that utilizes the stroke-width CSS property (or SVG attribute), the stroke width is not rendered correctly in Telerik's PDF preview control. Regardless of:

• Unit used (e.g., px, pt, em, %, etc.)
• Value assigned (e.g., stroke-width: 5, stroke-width: 30, etc.)

…the resulting line always appears thin, as if the stroke width were ignored entirely. This makes the SVG appear incorrectly and inconsistent with its rendering in other PDF viewers (e.g., Adobe Acrobat, Chrome's built-in viewer).

Steps to Reproduce

1. Run the application from provided MCVE
2. Observe the SVG lines in PDF preview: all strokes appear thin, regardless of defined stroke width.

Expected Behavior

The Telerik PDF viewer should correctly honor and render the stroke-width property defined within SVG elements embedded in the PDF file.

Actual Behavior

All strokes in SVGs appear very thin, with no visual difference despite varying stroke widths in the source SVG.

Sample Files

• ✅ _PdfExample.pdf: A PDF with SVG lines that render correctly in Microsoft Edge.
• ✅ _PdfExample.pdf: Screenshot of how the PDF file looks in Microsoft Edge.
• ❌ _ScreenshotFromTelerik.png: Screenshot of how the same file looks in the Telerik PDF Viewer (note the thin lines).
• 🔍 _LargeStroke.svg, _SmallStroke.svg: The original SVGs used in the PDF file.

Environment

Component	Version
Telerik UI	2025.1.211.48
.NET Framework	.NET Framework 4.8
OS	Windows 11

Suggested Fix

Ensure that the rendering engine used by RadPdfViewer fully supports the SVG stroke-width attribute when parsing and rendering embedded SVG content.

PdfViewer throws a "Position is out of range" exception when scroll.

There are cases in which some of the images in a pdf file appear with inverted colors.

Resolution: 
The issue is duplicated with feedback item FIX. RadPDFViewer shows wrong colors
Here is the link to item:  http://feedback.telerik.com/Project/154/Feedback/Details/111786-fix-radpdfviewer-shows-wrong-colors

ADD. RadPdfViewer - add support for data fields

PdfViewer - does not arrange correctly the layout of some pages.

Description: Single Page View Displays one page at a time, with no portion on other pages visible.

To reproduce: When load the document, the text from file is not visible

FIX. RadPdfView - dragging RadPdfViewer to a form does not include the TelerikCommon assembly

There is no workaround for this issue.

To reproduce:
When document that contain a specific formatting is imported there is some missing text.