Supported file types

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

Please 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 is opened and converted to fax using either Chrome, or Internet Explorer v10. text/html
MHT*** MHT web archive files; HTML with embedded images

Note that HTML is opened and converted to fax using either Chrome, or Internet Explorer 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 fax using either Chrome, or Internet Explorer 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 image sizes below;
*** = HTML documents are rendered using Chrome or 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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