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Digital signature library for Android

Digital Signatures can be considered as the electronic equivalent of a physical signature with ink on paper. However an electronic signature also provides certain advantages over an ink-and-paper signature. It can secure and protect a digital document by creating a signing fingerprint uniquely identifying a sender. The recipient of the document and signature confidence of the sender's identity validates that the document has not been altered by anyone else since it was signed.

Some of these main advantages are:

Authentication
A digital signature allows precise identification of who created/signed a document. It can be safely assumed that when a signature is valid, you know who signed it.

Integrity
A digital signature allows users to easily validate whether the contents of a document were changed after it was signed.

Non-repudiation
A digital signature ensures that the signer cannot deny that they signed the document.

PDFTron SDK benefits include:

  • Import signature fields via XFDF/FDF
  • Export signature data via XFDF/FDF
  • Built-in support for PKI signing (and PFX digital certificates)
  • Support for custom signature handlers
  • Sign with images, ink annotations, or entirely custom appearances

linkDigital Signature vs e-Signature

An e-signature is an annotation that appears in the document but has no additional identifiable information about the creator other than an author field which can be altered.

A digital signature on the other hand uses a cryptographic algorithm to uniquely identify the author and any alterations to the document including the annotations or e-signature would result in an invalid digital signature validation.

linkSignature tool

Android has a built in signature tool that lets users create signature annotations. In fact, signature annotations are just freehand annotations, or ink annotations according to the PDF specification. It's possible to preview signatures, save signatures and apply default signatures directly.

One significant difference between digital signatures and signature annotations is that digital signatures employ asymmetric cryptography and provide an extra layer of security whereas signature annotations are just created superficially and can move around the document.

linkGet started

Signature tool
To add a signature with or without signing.

Signing a PDF Document

Certifying a PDF Document

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