PDF Tools AG - Customer testimonial - success story

eSign solution tegoly for MS Teams – powered by PDF Tools

Application requirements

tegoly started with the task of developing functional applications for MS Teams users to close gaps and simplify processes. With tegolySIGN, the start-up provides an intuitive electronic signature solution that is fully integrated into Microsoft Teams. Here, users can add signature fields to PDF documents directly from MS Teams and send them to internal as well as external signers.

To do this, tegoly needed a PDF viewer compatible with any browser and MS Teams, and a component for applying signatures to PDFs. In addition, there is the requirement that these tools run under .NET Core.

Customer benefits

The software components used from a single source are perfectly coordinated. From the first contact to the realization of the project, tegoly could count on the API documentation and the full support of PDF Tools Development. With their help, tegoly was able to develop an executable MS Azure signature application very quickly. The high quality and performance of the products provides tegoly with good prerequisites for the upcoming market launch of tegolySIGN. Thus PDF Tools was able to offer tegoly a very attractive overall package for the use of the SDKs in their application.


Various 3-Heights® components from PDF Tools were used to implement the solution, which runs entirely on Microsoft Azure. The 3-Heights® PDF Validator first checks incoming PDFs for PDF/A compatibility. Further, the 3-Heights® PDF to PDF/A Converter converts each document to PDF/A to ensure long-term archiving. Finally, 3-Heights® PDF Security enables digital signatures to be applied. The PDF Web Viewer is also used to display documents in MS Teams.

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Customer statements

“Thanks to PDF Tools' very good support and easy-to-integrate API, we were able to reach important development milestones quickly. PDF Tools was able to offer us a price range that fit into our startup budget.”

Sven Gosda,
CEO & Co-Founder, tegoly GmbH

“The SDKs from PDF Tools helped to quickly advance the development of tegolySIGN. Due to the very good support during the development, we were able to realize the application within a very short time.”

Jan Gosda,
CTO & Co-Founder, tegoly GmbH

Brief portrait of tegoly GmbH

The startup tegoly was founded in 2021 with the idea of developing applications for Microsoft Teams. This is what tegoly pursues with the goal of simplifying key processes in companies and closing the gap between inhomogeneous applications. In doing so, tegoly concentrates on functional applications that focus on usability for the user. With tegolySIGN, the founding team from Witten, Germany develops an integrated eSign solution that allows documents to be signed in Microsoft Teams in a legally secure manner.