ConceptDraw Visio File Converter is a free web service, provided by Computer Systems Odessa that is available to anyone who uses diagramming software and has a requirement to open Visio (VSD) documents. This service have been created because Visio users often don't save their drawing into Visio XML (VDX) file format. They typically send files as VSD documents, often making it difficult to read them by other diagramming software packages. It is a great problem especially for Macintosh users because Visio is not available on the Mac.

The service converts files from Visio binary file format VSD into Visio XML files which then have a VDX extension. Drawings you want to convert should be sent as an email attachment to a special email address that is easy to obtain by completing a web form. The form is used to protect a service from overloads caused by SPAM deliveries.

It is possible to send files for conversion in the form of ZIP or SIT archive packages, also you can send several documents in one letter. The converted file result is delivered back as an email attachment in either ZIP or SIT format, the conversion process takes less then 15 minutes.