Plagius can open and extract text from the following file formats:
| Format | Extensions | Remarks |
| Word Files | doc and docx | Password-protected files cannot be opened by the program. |
| Portable Document Format | Encrypted or password-protected files cannot be opened by the program. | |
| LibreOffice/OpenOffice Files | odt | |
| PowerPoint Files | ppt | |
| Web Pages | htm, html | |
| Rich Text Format | rtf | |
| Plain Text | txt | Standard Unicode: UTF-8 |
* General Remarks: texts embedded in images, such as scanned text pages in PDFs, for example, are not recognized by Plagius.