We're sorry Aspose doesn't work properply without JavaScript enabled.

Free Support Forum - aspose.com

Merge PDF files using Aspose.PDF for .NET - API is taking long time for processing


We have tested with the file that you have shared and found that another ticket as PDFNET-48232 has already been logged in our issue tracking system with this file. We have updated the information under respective ticket about this single file issue. We are investigating the files logged under both tickets and will share updates in next week about their resolution.


We are really interested in getting an ETA to get our tickets moved. Try to put specific time instead of month or week. So we know when to invest time in taking follow up.


We would like to share with you that earlier logged ticket(s) are under the phase of investigation. We anticipate to complete the investigation during this week and as soon as they are completed, we will be in position to share an ETA. We will inform you in this forum thread as soon as we have additional updates after investigation.


We would like to share with you that we have completed the investigation of both tickets. We will provide a fix against these issues in upcoming version of the API i.e. Aspose.PDF for .NET 20.7 which will be released in first week of July.


Its been more than a month they’re in investigation. And it is very difficult to keep chasing for solution and answering our clients for the same. We bought paid support to expedite the process and we do not see that happening. Do you have any escalation authority we can reach to? Please advise.


We already have shared ETA with you which is Aspose.PDF for .NET 20.7. The investigation of the issue has been completed and we intend to provide its fix in upcoming release of the API.


Do you have a list of tickets that is going to be released with 20.7? We have a bunch of tickets open.



The release of the API has been scheduled for the end of this week and release notes will be published along with it too. As soon as we have the release notes ready, we will inform you.

Update? I think first week of July is done.


We would like to share with you that your both issues (PDFNET-48386, PDFNET-48232) have been resolved in Aspose.PDF for .NET 20.7. We have published the release notes in API documentation which you can visit at the given link. As soon as we publish the API for download, we will send you a notification in this very thread.

The issues you have found earlier (filed as PDFNET-48232,PDFNET-48386) have been fixed in Aspose.PDF for .NET 20.7.

Hello support,

Issue still not fixed with 20.7 and 20.8 version. Please check below shared code. It’s been hard to answer our client now. Please take this as priority.




We tested the scenario using following code snippet with Aspose.PDF for .NET 20.8 and were unable to notice any issue.

Document doc = new Document();
Document mDoc = new Document(dataDir + "MM_20200325_Stations Interdiciplinary Minutes.pdf");
doc.Save(dataDir + "merged20.8.pdf");

merged20.8.pdf (8.2 MB)

Could you please share a bit more details about the issue that you are facing at your side. Also, please make sure to use a valid license while merging the PDFs.

Hello support,

The solution you have suggested is not working for us so can you please suggest another solution We are still facing issue.



As requested earlier, would you kindly share some details about the issue that you are facing? Is it slow performance of the API? OR you are facing some issue in resultant PDF document?

I see your suggested code differs from the one we have. But at this moment, it’s very tightly coupled in our enterprise level application and it’s very risky to do that for us. Please provide us another solution.


In your shared application, you are using FileStream to read and write the files. We tested using FileStreams as well. Also, we tested the scenario using your shared application with Aspose.PDF for .NET (20.8 and 20.9). We did not notice any issues. We request you to please share some screenshots of the issue that you are facing so that we can also try to replicate it in our environment and address it accordingly.
MergeResult_090520034655.pdf (8.2 MB)

As you said in a previous comment here I am sending you video of our issue using 20.8 & 20.9 so please check it.



Thanks for sharing the videos and explaining the issue to us.

The exception which you are facing is due to trial version limitation. Would you kindly make sure that you are setting the license correctly before using the API. OR please check if you are using a valid license with v20.8 or v20.9. In case issue still persists, please share your license file with us in a private message. We will test it in our environment share the feedback with you.

You can send a private message by clicking over the username and pressing Blue Message Button. We strongly suggest that you do not share your license publicly.

Thanks It is working.

1 Like