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Blurry text in PdfViewer control.

Thread ID:





120171 Sep 7,2015 02:06 PM May 5,2017 07:15 AM WPF 7
Tags: PdfViewer
Asked On September 7, 2015 02:06 PM

Text in PdfViewer looks very blurry. It is clear, that ClearType is not used when drawing text as can be seen by screenshots. 
And probably you don't use
to display text.
I attached 3 screenshots. One from PdfViewer, another - from Acrobat Reader, and third one with them side by side.
Are there anything that can be done to solve this issue?

Attachment: BlurryText_44d9fb18.zip

Balasubramanian Sundararajan [Syncfusion]
Replied On September 8, 2015 02:51 AM

Hi Belikov,

Thanks for using Syncfusion product.

We have created an Direct Trac incident for the follow up of the fix for the issue “Texts looks blurry in PdfViewer control”. Please log on using the link below to track the incident.



Stefan H
Replied On August 31, 2016 05:05 AM


I'm currently facing the same problem with version Also the "Getting Started" sample for the PDF Viewer control is showing this behavior. So was this problem ever solved?

Balasubramanian Sundararajan [Syncfusion]
Replied On September 1, 2016 09:08 AM

Hi Stefan, 

We are using GDI rendering surface to render the page content of the PDF document, so the PDF document content quality may differ in different zoom values. We consider this as a behavior of PdfViewerControl. We have created a simple sample to demonstrate the same which renders the texts as a path in the Graphics. We are performing the same in our PDF Viewer control for the rendering of text elements. 
We could see similar quality loss in displaying the content in the sample, and it is the default behavior of GDI rendering.

Please find the sample in the following location:

However, Can you please share us the PDF document in the forum if it does not contain any confidential data? 
Else kindly create a Direct Trac incident and share us the PDF document with which you are facing issue. It will be helpful for us to analyze more and assist you better on your query. 

Please let us know if you need any further assistance.

Balasubramanian S 

Stefan H
Replied On September 1, 2016 12:25 PM

Hi Balasubramanian,

I created an incident with a sample PDF file: https://www.syncfusion.com/support/directtrac/incidents/163178

The attached screenshot shows only a small portion of the PDF file, but you can clearly see a big difference in text quality. This is the 100% view in the "Getting Started" demo and as comparison an even slightly smaller zoom factor in Adobe Acrobat Reader DC.

While zooming definitely changes the quality, it always stays behind other PDF viewers. It's like the text gets rendered for the wrong size and the resulting image is scaled/stretched to the final size.

Attachment: pdfsidebyside_ae9ac945.zip

Balasubramanian Sundararajan [Syncfusion]
Replied On September 2, 2016 07:54 AM

Hi Stefan, 

Thank you for your information.  

Kindly follow up the incident for more details on your query. 

Balasubramanian S 

Mark B
Replied On May 4, 2017 08:17 AM


just changed the Assemblys from 14.4460.0.15 to 15.1460.0.41.

With Version 14.xxx the rendering was quite good, nearly Acrobat quality a bit slower in rendering time. Now with 15.xxx ist not usable anymore, see atached sidebyside Picture.

Best regards 

Attachment: pdf_sidebyside_dbeff23d.zip

Sathish Sivakumar [Syncfusion]
Replied On May 5, 2017 07:15 AM

Hi Mark, 
Thank you using Syncfusion products. 
We have internally fixed the issue “Degradation in rendering quality of PDF document in PdfViewer WPF in Essential Studio version when compared with Essential Studio version”. This fix will be included in our main release Essential Studio 2017 volume 2 and it is expected to be available on the mid of May 2017. 
Please let us know if you need any other assistance. 


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