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Sign, verify, and protect PDF documents
Apply certificate-based digital signatures to PDF documents and validate signed content. Digital signatures are suitable for document workflows that require signer authentication and integrity verification.
Apply trusted digital signatures
Add certificate-based digital signatures to PDF files using supported signing credentials. PDF signing is suitable for documents that require authenticated approval and verifiable signature information.
Validate existing signatures
Validate signed PDF documents to check signature status, certificate validity, revocation information, and document changes. Signature validation is suitable for workflows that require signed documents to be reviewed before approval, archival, or further processing.
Multi-signature approval workflows
Add multiple digital signatures to the same PDF document while retaining existing valid signatures. Multiple signatures are suitable for documents that require sequential approvals from more than one signer.
Frequently Asked Questions
Can Syncfusion .NET Document SDK digitally sign PDF documents without Adobe dependencies?
Yes. The Document SDK performs digital signing and validation directly within your application without requiring Adobe Acrobat or other desktop tools. Signing and validation run in managed .NET code.
Does Syncfusion .NET Document SDK support digital signature in Docker and cloud environments?
Yes. The Document SDK supports digital signing and validation on Windows, Linux, Docker, Azure, AWS, and Google Cloud .NET deployment environments.
Does Syncfusion .NET Document SDK support long-term PDF signature trust?
Yes. The Document SDK supports Long Term Validation (LTV) workflows that preserve certificate and revocation evidence alongside the signature, helping archived documents remain verifiable for audit and compliance purposes.
Does Syncfusion .NET Document SDK support multi-signature workflows?
Yes. Multiple stakeholders can sign the same PDF document while preserving previously applied signatures. Each signature remains independently verifiable throughout the approval process.
Do digital signatures in Syncfusion .NET Document SDK support external signing providers?
Yes. The Document SDK supports external signing workflows that integrate with HSMs, smart cards, USB tokens, and cloud-based signing services.
Is a separate license required for Syncfusion .NET Document SDK digital signatures?
No. Digital signature capabilities are included as part of the Document SDK licensing model, allowing teams to integrate signing and validation workflows without requiring a separate license. Current licensing details are listed on Syncfusion pricing page.
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