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Get Europe's most TRUSTED digital signature

Digitize your signature workflows with Europe's most advanced and most trusted digital signature.
100% legally binding and 100% GDPR-compliant  
Our mission


We make digitalization easy. Start digital signing with Europe's most advanced signatures within minutes.
more about sproof
sproof is an Austrian-based technology company
sproof is a startup company co founded by Clemens Brunner, Fabian Knirsch and Erich Höpoldseder.
100% legally-binding and GDPR-compliant
Our digital signature product is legally-binding according to the eIDAS regulation and fully GDPR-comliant.
sproof is reinventing
digital signing
sproof allows you to fast and easy integrate digital signatures in your existing processes and tools.
sproof is for everyone
sproof offers an API for easy integration into your existing application.


Discover what is new. Follow the sproof blog.
Digital signatures with sproof sign at the Vienna Business Agency
The Vienna Business Agency supports local and international companies in all phases of their business development, advises on entrepreneurial issues...
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Join sproof at the Mobile World Congress in Barcelona
Join sproof at this year's Mobile World Congress in Barcelona. We are presenting Europe's most trusted digital signature solution in Hall 2 at 4YFN...
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3 steps to a fully digital document workflow
Is your digital document workflow in order? Check out this guest post by sproof CEO Clemens Brunner on the blog of our Finnish partner Zefort....
Read More
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Together with our customers, we shape the
digital future.
Florian - blockpit.io
"Muss sagen ich bin begeistert, mir fällt nichtmal etwas ein, das ich verbessern würde. Gratulation zu dem fantastischen Produkt!"
Dr. Gabriele Tatzberger - Wirtschaftsagentur Wien
"Als Wirtschaftsagentur Wien unterstützen wir seit fast 40 Jahren Gründerinnen und Gründer dabei, ihre Geschäftsidee erfolgreich umzusetzen und nachhaltig aufzubauen. Mit innovativen Tools wie sproof sign gelingt es uns, unsere Angebote auch digital zeitgemäß und effizient abzuwickeln."
Buchhaltungsagentur des Bundes
Wirtschaftsagentur Stadt Wien
FH Technikum Wien
Wirtschaftskammer Salzburg
Paracelsus Medizinische Privatsuniversität
Modul University
Berchtesgadener Land
FH Salzburg
FH Krems
FH Kärnten


If you need help, have questions or feedback about our company or products, please do not hesitate to contact us. Please do not forget to check out our FAQs.