A powerful, secure and flexible electronic signature API

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How to start integrating?
Thanks to our powerful API, based on REST services, you will be able to integrate and start signing documents quickly and easily

Easy and fast to use
Integrate Viafirma’s services in your applications and improve your customers’ user experience.

Safe and reliable
We support several types of authentication: OAuth2, Basic… Use the one that best suits your use case.

Adaptable and customizable
Don’t worry about logos and colors. We have a flexible API that supports any design on any interface.


Looking for integration with electronic signature?

Describe the signing process and we will provide you with the solution that best suits your needs.




A plugin has been developed for Google Workspace with which you can validate documents directly from your email inbox. Watch this video where we show you how to create a signature request from Gmail easily.



A CRM is vital for sales reps to know the status of each customer and allows them to provide essential quality service. Salesforce allows these tasks, such as signing documents, to be automated so that the work day is more efficient. Thanks to Viafirma you will be able to digitalize your contracts, validate them and send them from Salesforce in a simple, efficient way and with full legal guarantees.



Thanks to this integration you will be able to incorporate the electronic signature of documents in SAP, enterprise resource planning system.
You will be able to formalize agreements quickly, securely and from anywhere and automate processes thanks to our integration with SAP.



Oracle Corporation is a company specialized in the development of cloud and on-premises solutions. It delivers consistent processes and data across the most important business functions.
Improve customer engagement, increase your company’s agility and react to change quickly.



Zapier allows you to connect our software with more than 2000 web applications. The automated connections (so called Zaps), are set up in a matter of minutes without touching any code. This allows you to automate different daily tasks and set up workflows between various applications that would otherwise not be possible.

Legal guarantee always up to date

100% eIDAS. Trust services
Strict compliance with the DAS regulation. Choose simple, advanced or qualified signature according to your needs, within the most demanding legal framework in the world in terms of digital identity.

100% RGPD. Data protection
Informed consents that comply with the new RGPD in all aspects. All our solutions are extremely responsible with personal data.

imagen garantía legal

Our clients

The best electronic signature solution for your business


+ than 20 years dedicated to electronic signatures

We are Viafirma, an innovative software development company with a suite of products focused on the realization of signatures in a digital environment. We work in the area of the so-called Trusted Digital Services and we are specialised in the development of solutions related to electronic signature.






    Frequently Asked Questions

    The electronic signature is a set of data associated with an electronic document and used to identify the signatory. It must guarantee the authenticity and identity of the signatory and be linked to the signed data in its entirety.

    Our signature tools are fully compliant with the requirements of the eIDAS regulation, considered the most demanding digital identity trust services standard in the world.

    Documents can be stored in the tool itself or stored in your document management system.

    Viafirma allows to customize the final stages of the life cycle of a signed document, through the implementation of different mechanisms to transfer and/or copy the generated and signed documents.

    We offer different options:

    • Storage in Viafirma’s servers.
    • External transfer: a system for transferring signed documents to an external system or repository can be activated.
    • Automatic deletion: can be configured at various points in the process, for example in the implementation of the external transfer, i.e. if the transfer was successful, the document is automatically deleted.

    We offer an interface 100% adapted to mobile devices, allowing the execution of tasks entirely on the mobile. In addition, we have free applications in Apple Store and Play Store.

    The most widespread method is using the digital certificate. However, there are other options that are much simpler and just as valid. You can learn more about how to sign a document digitally on our blog.

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