Supported File Types

The following table lists file types supported as attachments by the InterFAX service. See also System Limitations for unsupported file behaviors.

Note: Attempting to send a file with an extension which is not its native extension, as defined below, will result in a rendering error.

Document Extension File Type MIME type
DOC, DOCX Created by Microsoft Word 97, 2000, XP, 2003, 2007, 2010, 2013, 2016 & 365; Google Docs; Zoho Docs. application/msword, application/vnd.openxmlformats-officedocument.wordprocessingml.document
DOT Created by Microsoft Word 97, 2000, XP, 2003, 2007, 2010, 2013, 2016 & 365. application/msword
XML Currently supported XML types: Microsoft Word 2003 XML application/xml
PDF Adobe Acrobat (Version 9) application/pdf
TIF Group 3 TIFF, may be in standard or fine resolution **** image/tif
TXT ASCII Plain Text text/plain
XLS, XLSX Microsoft Excel 97, 2000, XP, 2003, 2007, 2010, 2013, 2016 & 365; Google Docs; Zoho Docs
Note: Only active worksheets will be faxed
application/vnd.ms-excel
HTM/HTML*** HTML files Note that HTML is opened and converted to faxes using Internet Explorer v6 (as of June 2013:) v10. text/html
MHT*** MHT web archive files; HTML with embedded images
Note that HTML is opened and converted to faxes using Internet Explorer v6 (as of June 2013:) v10.
message/rfc822
URL Windows URL files
Notes: 1.) The contents of the linked page will be faxed; 2.) HTML is opened and converted to faxes using Internet Explorer v6 (as of June 2013:) v10..
application/internet-shortcut
PPT, PPTX Microsoft PowerPoint 97, 2000, XP, 2003, 2007, 2010, 2013, 2016 & 365; Google Docs; Zoho Docs application/vnd.ms-powerpoint
GIF Non-animated GIF files * image/gif
PNG PNG files image/png
JPG/JPEG JPEG files * image/jpg
PS PostScript application/postscript
EPS Encapsulated PostScript application/eps
RTF Rich Text Format application/rtf
BMP Windows Bitmap * image/bmp
PCX PC Paintbrush Bitmap ** application/pcx
SNP Microsoft Access Snapshot (Version 10 on Windows 2000) application/snapshot
ZIP Any of the above file types may be compressed as a zip file. Multiple files within a single zip file are allowed. application/zip

** For best results use only monochrome (1-bit color, not grayscale) with the following image sizes

*** HTML documents are rendered using MS Internet Explorer, with page margins set to 10.16mm (left, right, top, and bottom)

****Image Sizes

  Standard Resolution Fine Resolution
  Width Height Width Height
A4 1,728 1,169 1,728 2,338
Letter 1,728 1,100 1,728 2,200
Legal 1,728 1,400 1,728 2,800
B4 2,048 1,357 2,048 2,714

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