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Flattening Polyline Annotations Connects First and Last Vertices

Hi Aspose,

I have polyline annotations on my pdf document that I want to flatten. However, during the flattening process, it automatically connects the first and last vertices with a straight line. For example, if I have a polyline annotation in the shape of a “V”, the flatten method connects the first and last vertices such that the shape changes to a triangle.

Is there any way to prevent this as I want to maintain the original shape of my annotation?

(This is for .NET framework)



Would you kindly share the sample PDF document for our reference. This would help us testing the scenario in our environment and address it accordingly.


Please find the sample pdf file attached containing 2 polyline annotations.

dummy file.pdf (89.2 KB)

This is the flattened pdf file.

dummy file flattened.pdf (225.9 KB)


We were able to notice the issue in our environment using Aspose.PDF for .NET 19.11 and logged it as PDFNET-47393 in our issue tracking system. We will further look into details of the issue and keep you posted with the status of its correction. Please be patient and spare us little time.

We are sorry for the inconvenience.

Thank you @asad.ali