We recommend Portable Document Format (PDF) as it was invented to ensure that a document, once created, would be reproduced true to the original.
We do also allow the following file types:
Microsoft Excel 97-2003 .xls
Microsoft Excel .xlsx
Microsoft Word 97-2003 .doc
Microsoft Word .docx
Rich Text .rtf
Microsoft PowerPoint 97-2003 .ppt
Microsoft PowerPoint .pptx
PDF (recommend ISO v1.7) .pdf
TIFF images .tif, .tiff
GIF images .gif
JPEG images .jpg, .jpeg
PNG images .png
HTML .htm, .html
Plain text .txt
Please ensure your documents are black and white or as close as possible.