I have a string that contains a pdf encoded in Base64. Can I load it into Aspose.Pdf?
You can create a stream from base64 string and load into Document:
var pdf = "JVBERi0xLjQKMSAwIG9iago8PAovVGl0bGUgKP7/K";// base64 pdf file.
byte[] pdfBytes = Convert.FromBase64String(pdf);
var doc = new Document(new MemoryStream(pdfBytes));