# Digital Signatures

> Sign PDF and PDF/A documents in Windows Forms: certificates from files or the Windows store, signature fields, several signers and RFC 3161 timestamps.

- **Product:** TX Text Control .NET for Windows Forms
- **Section:** Documentation
- **Kind:** Topic
- **Path:** TX Text Control .NET for Windows Forms > Digital Signatures
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/llms-full.txt

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## On This Page

- [How Signing Works in TX Text Control](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/#how-signing-works-in-tx-text-control)
- [Find the Right Page](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/#find-the-right-page)
- [Where to Start](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/#where-to-start)
- [Related Sections](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/#related-sections)

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## In This Section

- [Certificates](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/certificates/llms.txt): Load X.509 signing certificates in Windows Forms from PFX files or the Windows certificate store, let users pick one with X509Certificate2UI and check it.
- [Multiple Signatures](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/multiple/llms.txt): Sign one PDF for several people in Windows Forms: one DigitalSignature per signature field, different certificates, sequential signers and a final save.
- [Overview](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/overview/llms.txt): Digital and electronic signatures in Windows Forms compared: integrity, authenticity, whole-document or field signatures, DigitalSignature and workflows.
- [Signature Fields and Signature Appearance](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signature-fields/llms.txt): Sign the named SignatureField frames of a Windows Forms TextControl: SignerData, a SignatureImage and how it's saved, the layout dialog and an SVG stamp.
- [Signing PDF Documents](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signing/llms.txt): Sign the TextControl document or a merged invoice as PDF in Windows Forms with DigitalSignature, handle FilterException and verify the signatures in code.
- [Timestamp Configuration](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/timestamps/llms.txt): Configure RFC 3161 timestamps for PDF signatures in Windows Forms: the timeServerURL parameter, fallback servers, InvalidTimeServer, fields and PAdES-T.

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## Nearby

- **Previous:** [Passwords and Access Permissions](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/pdf/passwords/llms.txt)
- **Next:** [Overview](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/overview/llms.txt)