InterFAX - how it works

For send and receive faxes with GTC Interfax you don’t need any separate telephone lines, no fax machine and no special software: access to the internet and an e-mail account will do, to send and receive faxes from anywhere in the world. Whether from the office, from home or via mobile phone when you’re on the go.

Fax dispatch via web form


Your can send your faxes directly in your secure customer area:


  • Enter the fax number
  • Upload your files/attachments or
  • write the text you would like to fax via text editor


Your fax will be sent directly. In the secure customer area you can view the status of your fax at any time.

Fax dispatch via e-mail


  • Enter the fax number in the TO-field in following format: “fax
  • Attach the document (e.g. a PDF-file) (if there’s no attachment, the text of your e-mail body will be sent)



Your fax will be sent directly. The status will be returned by mail.

Sending faxes via API

Send your faxe from your own system:

  • sending faxes via VB, Java, .net, C#, PHP
  • easy to integrate with just a few lines of code
  • without any installtion or investment in hard- or software for your faxserver

Choose the interface you prefer:
REST, SOAP or SMTP-interface

All interfaces support the simple sending of faxes as well as the professional API with advanced features (e.g.: multiple recepients, sending time-shifted and others).

Receive your faxes via e-mail


  • Select your individual fax number: from service numbers in Germany, land line numbers in Austria and Switzerland up to international numbers.
  • Enter your e-mail address - you receive all incoming faxes optionally as PDF- or TIF.
  • Recall your received faxes via your secure customer area.



Martina Assenmacher

Ingram Micro Pan Europe GmbH

"The sending of our newsletter takes only a few minutes – nevertheless it is handled in a very professional way. We are not in need of additional software and do not have to enter a long term commitment. That’s how we stay flexible. Furthermore we really appreciate the support of the attentive GTC-employees."


Uwe Streb

Festina Uhren GmbH

"The customer service gave us great advice. Now we are getting much more out of our actions, can make campaign comparisons and achieve exactly what we want."


Jürgen Klein


"GTC is our long-standing partner for sms and e-mail boradcasting and is very reliable. Thumbs up."


Bettina Holz

X-PERION Consulting AG

"Our employees are on the road throughout Germany, partly even in Europe. A regular coordination is essential here. We are completely independent with GTC central meeting: all participants are dialing themselves in via telephone. It doesn’t matter, where the participants are. Even the dial-up from abroad happens at low costs, due to international access numbers."


Edgar Augel

Stadtmobil carsharing AG

"E-mailings created with the template editor look great. In addition, our mailings now always adapt to the size of the receivers with responsive design. Fantastic."


Roland M. Rupp

Schweizerischer KMU Verband

"The service at GTC leaves nothing to be desired. Also the simple operation, the evaluation and the multilingual menu is great."


Christof Korr

CreditPlus Bank AG

"An sms will not be overlooked. Therefore, sms-mailing is our choice when it matters. With GTC, we have found a professional, with which everything runs great. And what is especially important to us is that all data remain in Germany."

Among our satisfied customers
+49 (0)7 11 - 4 90 90-0