concord limitations  

The following file types can be attached to an email message and converted to a fax by the Concord 

network. Other file types have not been tested for compatibility. Results may vary if other file types 

are used.

• Microsoft Word (*.doc, *.docx)

• Microsoft Excel (*.xls, *.xlsx)

• Microsoft Power Point (*.ppt, *.pptx)

• Microsoft Visio (*.vsd)

• HyperText Markup Language (*.html, *.mhtml)

• Adobe Acrobat (*.pdf)

• JPEG image (*.jpg)

• TIFF image (*.tif)

• ASCII Text (*.txt)

• Rich Text (*.rtf)

NOTE: Be mindful of the file sizes of the documents you are faxing, particularly if you are sending 

scanned images, as they can be quite large. While most source documents faxed are usually quite small 

(less than 200 KB), Concord will limit the maximum size of attached file(s) with either a single file or 

multiple files. The current limit is: 10,240KB (10MB).

Files exceeding these limits are most always high‐resolution, multi‐color, scanned images. In addition 

to exceeding size limits, such images are not typically “fax friendly”. Documents should contain no 

color, shading, or gray‐scale, and never printed as “photo‐quality”. Color, or shaded documents do not

translate well to fax and will contribute to exceedingly large file sizes and longer transmission times. 

Documents with graphic art content should be limited to solid black, with no shading, or gray‐scale.