PSPDFKit facilitates paperless signing workflows with the Electronic Signatures and Digital Signatures components. These are two components that can be licensed separately and don’t depend on each other.
The Electronic Signatures component lets users create signatures from ink drawings, bitmap images, and text. It includes a built-in UI for adding and deleting signatures in documents with or without a signature form element. Annotations are used under the hood to execute the electronic signing process. This feature also contains support for programmatically marking ink or image annotations as signatures. See Adding an Electronic Signature to read more.
Electronic Signatures introduces support for three different modes of adding signatures: draw, image, and type. This allows you to integrate a feature-rich signing experience inside your app. Please see our Customizing the Signature User Interface guide to learn about available API options.
You can also implement callbacks to provide signature storage so that users can reuse their electronic signatures across documents.
ℹ️ Note: Using Electronic Signatures requires iOS 13 or newer, since it uses new APIs that have only been available since iOS 13. PSPDFKit will assert that the deployment target is high enough when initialized.
Digital Signatures are signatures that are signed with a certificate. This signing approach is different from the one supported by Electronic Signatures, since digital signatures have a unique fingerprint identifying the signer and are reliable proof of the document’s origin and protection against modification by third parties. Check out our Digital Signatures guides for more information.
Electronic Signatures and Digital Signatures are inherently different, but they can under some circumstances work together — for example, by using the Electronic Signatures UI to let the user create a drawing or select an image, and using this for the appearance of a generated digital signature. To learn more, see Using Electronic Signatures and Digital Signatures Together.
For PSPDFKit licenses obtained in April 2021 or earlier, limited signatures functionality is included with the Annotations component. This older signatures functionality will continue to be maintained and supported. However, we recommend using Electronic Signatures for new PSPDFKit integrations. Please read our migration guide to learn how to move from the older signatures functionality to Electronic Signatures.