We operate a web app which requires end users to upload one or more files, which are then compiled into a single PDF. We need to support a wide range of file types – Microsoft applications plus images and PDFs. We tried Aspose because we were building a new conversion application and we needed a tool which offered functionality which is missing from our current implementation:

• Faithful reproduction of document layouts (e.g. retaining the layout of entire Excel sheets rather than splitting them across several A4 pages)
• Retaining tracked changes and comments in Microsoft documents
• Retaining notes and comments in PDFs
• Converting MS documents with external data
• Support for a wide range of file types

We built a proof of concept with the Aspose trial and are pleased to say that it has met all these requirements. It was easy to implement and supports wide variety for .NET frameworks which give us future stable options to migrate as per our needs.