Thanks for your inquiry. Please note that Aspose.Words mimics the same behavior as MS Word does. There is no limitation with respect to Html file size. Regarding page width, the size of page width must be between 7.2 pt and 1584 pt.
In terms of memory, Aspose.Words does not have any limitations. If you’re loading huge Word documents into Aspose.Words’ DOM, more memory would be required. This is because during processing, the document needs to be held wholly in memory. Usually, Aspose.Words needs 10 times more memory than the original document size to build a DOM in the memory.