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App to capture signatures on Android Tablet and Phone


Software available in different versions

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aSignatureOffice is the Android APP-Variant of our xSignatureOffice Product Range and allows you to fill out and sign read-only PDF/A documents online and offline from mobile Android Tablets and Android Phones. The free signature app accesses the webSignatureOffice server and can therefore be integrated into any web-based solution. When signing on the Android Tablet and Android Phone, your electronic signature is captured by the free signature app, aSignatureOffice. This process not only stores the signature image but also the best possible quality biometric data (timing).* An account with a webSignatureOffice server is required to use aSignatureOffice.

Learn more:
Online signing with the webSignatureOffice online signature server

*The maximum temporal and local resolution is set by the Android Tablet and Android Phone; further information and measurement values are available on request.



Document selection and document view

The start screen shows all the loaded documents and their statuses (signed, partially signed, unsigned, etc.), their expiration dates and much more. You can also sort the view by various criteria and select a document for editing.

In view mode, you can zoom into and flick through the document with the Android Tablet and Android Phone in the usual manner.


Filling out documents

Any entry fields in the document can be completed on the Android device before commencing the signing process. As well as filling purely text-based fields, you can also use marking fields (such as check boxes, radio buttons), e.g. to agree to the terms and conditions. It is also possible to use drop-down menus.


Signing documents

Signing on the Android Tablet can be initiated by typing manually into the signature field, or by starting a pre-defined, fully automated signature process which ensures no signatures are forgotten and which eliminates manual entry. The biometric data is safely encrypted and linked with the document. For your protection, each signature is protected on the server by a digital certificate. By using ISO-compliant signatures, the document can later be checked for changes and manipulation by any recipient (e.g. by using Adobe Reader).


The process of automatically generating a signature can be defined for each document with webSignatureOffice via the server and is guided by either key words in the PDF or by PDF signature fields (if the loaded document already contains these). This method ensures that even documents where the position and number of the signatures varies can be processed fully automatically. A third option is to state the pre-defined position details (page and X/Y position). It is, of course, also possible with aSignatureOffice to add a signature field to a document entirely manually and to alter the size and position before it is signed by yourself or a business partner.


The server and connection to customer systems

Documents are exchanged and controlled via an encrypted (SSL) webSignatureOffice server, which has a web interface that allows easy management of documents, signature expiry dates and users. Business customers can also choose to run the server themselves and in doing so directly activate and control it via the interfaces (web services) from the customer's system.


Offline capability

After the aSignatureOffice app is synchronised with the webSignatureOffice server, it can also be used to edit the loaded documents and capture signatures offline. The documents are automatically synchronised with the server as soon as the Tablet or Phone with aSignatureOffice is back online.


Integrating the app

As a native Android app, aSignatureOffice uses its full ergonomics with gesture control and trusted operating features as well as utilising the speed of the Android Tablet as best possible. aSignatureOffice will also enable business customers to integrate aSignatureOffice into their own apps as a component*.

Signing with Android Tablet's and Phone's made simple and secure thanks to aSignatureOffice from StepOver.

*In a later edition


Secure signature

The biometric data of the signature is already safely encrypted on the Android Tablet and thus linked with the document in such a way as to prevent misuse in another document. A public RSA key (2048 bit), or similar, is used for this so that the biometric data cannot be decrypted without access to the private RSA key assigned. This is stored safely with a notary who has produced the pair of keys. It is this procedure alone which allows the operator of the solution to demonstrate, should there be doubts, that they could not decrypt the biometric data and consequently they could not misuse this to sign other or altered documents.

Additionally, each signature is given a further digital signature by the server so that the recipient can check the integrity of the document, for example by using Adobe Reader.


Main functions

This product is a stand-alone, free signature app and does not require any additional third-party software (such as Adobe Acrobat). However, this signature capturing app is also available to integrators as a component for their own apps.

It is necessary to have a paid account with a webSignatureOffice server in order to run aSignatureOffice.

Learn more:



  • PDF/A documents created by the customer (via webSignatureOffice server)
  • It is also possible for the above PDF documents to have customer-defined signature fields (as well as customer-created form fields)


  • When the outgoing document is PDF/A compliant, the document remains PDF/A compliant after signing
  • ISO-compliant PDF signatures - can be checked using all standard products (e.g. Adobe Reader) and enables interoperability with other signature processes and programmes which conform with the standards
  • Capture a handwritten electronic signature using an Android Tablet and Phone
  • This signature is an advanced electronic signature in accordance with EU guidelines


  • Can also be fully integrated into customer apps as a component
  • Sign directly in the document (no separate signature window)
  • Preview of the selected PDFs
  • Allows browsing, zooming and continuous scrolling of PDF documents
  • Filling out of PDF form fields and supports check boxes, radio buttons and drop-down menus
  • Clear document management with status tracking, automatic reminder (for all signatories)

Ability to customise / integrate

  • Can also be fully integrated into customer apps as a component*
    *in a later edition


  • Template management (saving documents for re-use, including signature templates)
  • Intelligent signature templates (e.g. automated positioning of signature fields, even for dynamic documents, e.g. using key words)
  • Jumps automatically to the signature fields during the signing process and zooms in if necessary
  • Handles compulsory and optional signature fields differently (stop at compulsory field = stop the whole signing process)



  • Supports encryption on the Android Tablet using biometric data with RSA 2048 Bit
  • Delayed signing is possible at any time without compromising safety
  • Form fields automatically locked once signed
  • Signatures provided can easily be checked (using Adobe Acrobat Reader)
  • Secure communication over https

Software versions

aSignatureOffice for Android Tablet's
Version 1.x

GTIN order no.: 4260130060992

aSignatureOffice for Android Phone's
Version 1.x

GTIN order no.: 4260130060992

System prerequisites

Hardware prerequisites

Tablet and mobile phone with Android operating system

Operating system

Off Android 4.0

Information material

Information about StepOver signature software:

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