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Signature

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Provides functionality for signing PDF documents. Supports both digital signatures (with certificate) and electronic signatures (visual only).

The class enables adding signatures to PDF documents: Digital signatures use PFX/P12 certificates to cryptographically sign the document.Electronic signatures add visual representation (image/text) without cryptographic signing. For PAdES-B compliance, use CAdES signature mode (the default). For PAdES-T compliance, configure a in the signature options.

from nutrient_sdk import Signature

Construction 

Signature()

Creates a new Signature instance with default settings.

Methods

sign 

def sign(self, document: Document, output_path: str, options: DigitalSignatureOptions) -> None

Applies an invisible digital signature to a document.

Parameters:

NameTypeDescription
documentDocumentThe document to sign.
output_pathstrThe path where the signed PDF will be saved.
optionsDigitalSignatureOptionsThe digital signature options including certificate and metadata.

sign_field 

def sign_field(self, document: Document, output_path: str, field_name: str, options: DigitalSignatureOptions, appearance: SignatureAppearance) -> None

Applies a signature to a document using an existing signature field. Supports both digital signatures (with certificate) and electronic signatures (visual only).

Parameters:

NameTypeDescription
documentDocumentThe document to sign.
output_pathstrThe path where the signed PDF will be saved.
field_namestrThe name of the existing signature form field to use for the signature.
optionsDigitalSignatureOptionsThe digital signature options. Can be null for electronic signatures.
appearanceSignatureAppearanceThe visual appearance of the signature.