| AppendPDFFile(String) | Appends an existing PDF document |
| AppendPDFFile(String, Int32) | Appends pages from the specified source document starting from zero based page index in the source document. |
| AppendPDFFile(String, Int32, Int32) | Appends at most length pages from the specified source document starting from zero based index startIndex in the source document. |
| AppendPDFFile(String, String, Int32, Int32) | Appends at most length pages from the specified password protected source document starting from zero based index startIndex in the source document. |