All the benefits of electronic invoicing in a complete outtasking solution:
fast processes, low operating costs, full tracking and, above all, compliance with international law.

Simply enter a search term - e.g. date, cost centre or customers name - and the system will display the desired invoice

Secure electronic invoicing

Retarus eSign is a complete package for sending and receiving invoices electronically. It offers maximum transaction security and also complies with all legal requirements. In addition, it streamlines and accelerates the invoicing process for both the sender and recipient- significantly reducing process costs.

Retarus eSign

Electronic archiving included

Both senders and recipients must archive the signed invoices electronically and must be able to present them in a tax audit. Our eSign Online Archive is a complete solution that meets the requirements for both sides. Comprehensive search functions allow invoices to be located and displayed quickly and easily. This helps tax auditors and enables you to keep organized at all times.

Our experts are happy to assist you

Here´s how it works.

Retarus eSign
Easy signature validation using the free Adobe Acrobat Reader

The benefits speak for themselves.

Fast and inexpensive invoicing
Qualified electronic signature
PDF signature integrated in document
Simple validation with Adobe Acrobat Reader
No costs for hardware, software, or maintenance
Transparent calculation of operating costs
Supports legally-compliant signature cards
Conversion of different ERP document formats to PDF
Optional signature validation of PDF files
Optional archiving for sender and recipient
Software as a Service


Case Studies

Benefits for senders and recipients

Retarus eSign embeds both sender and recipient as fixed entities in the business process. The recipient also benefits from this process because it eliminates costly manual input of invoice data. Instead, all important document information is recorded automatically and forwarded directly to the internal ERP systems, such as SAP. The sender's accounting department doesn't have to worry about signatures, while the recipient can easily view and archive the document and signature in PDF format.

The crucial optimization thus consists in the complete integration of the electronic receipt of invoices into the entire invoicing workflow.

Signature validation and input tax deductibility

To guarantee tax deductibility, recipients are required by law to check digital signatures and archive electronic invoices. Retarus eSign can be supplemented by automatic signature validation to streamline this process. The validation check is documented and sent with the signed invoice to the recipient, allowing the recipient to dispense with time-consuming online signature checks. Retarus eSign ensures compliance with all tax authority requirements for electronic invoicing. With this process, Retarus eSign benefits the sender and recipient.

Legally compliant across Europe

Retarus eSign is the ideal legal and financial solution for flawlessly creating, validating and checking signatures when electronically invoicing your business partners. You are given the opportunity to document according to local regulations in over 40 countries that your electronic invoices have not been tampered with from the moment that they are created until the conclusion of the mandatory storage period. Whether invoices are sent or received, we take care of the entire process – from A to Z.


Case Studies

Case Studies: Each customer is a recommendation

Organizations from all industries and of all sizes utilize the Retarus communication platform to optimize their business and messaging processes. Our case studies provide examples of how organizations have utilized the Retarus suite of services to meet their companies messaging requirements.


Perfect logistics:
Volvo Trucks transmits invoices electronically


Case Studies

Product Brochure

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Seamless data exchange and B2B/EDI-Integration, SAP-certified to meet all of your compliance requirements.

For user manuals and technical information on our services, please visit Retarus' Enterprise Administration Services Portal (EAS).


Case Studies

We are here for you!

Do you have questions about Retarus, our products and services, or wish to receive further information? Your personal sales representative will assist you with any inquiries. Please contact us.

Retarus North America  //  US Headquarters

retarus Inc.
US Headquarters
201 State Route 17
Suite 603
Rutherford, NJ 07070

Phone: +1 201-268-5950
Fax: +1 201-205-1606
Toll Free: +1 855 462 0839
Toll Free Fax: +1 855 296 0858

Worldwide Retarus Locations

Worldwide Locations

messaging services since 1992