# Digital Signatures

> Add PDF signing to a WPF application: DigitalSignature and SaveSettings, certificates from PFX files or the Windows store, signature fields and timestamps.

- **Product:** TX Text Control .NET for WPF
- **Section:** Documentation
- **Kind:** Topic
- **Path:** TX Text Control .NET for WPF > Digital Signatures
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/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-wpf/digital-signatures/#how-signing-works-in-tx-text-control)
- [Find the Right Page](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/#find-the-right-page)
- [Recommended Order](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/#recommended-order)
- [Related Sections](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/#related-sections)

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## In This Section

- [Certificates](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/llms.txt): Load signing certificates in a WPF application from PFX files or the Windows store, open X509Certificate2UI with WindowInteropHelper and check validity.
- [Multiple Signatures](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/multiple/llms.txt): Collect signatures from several people in a WPF application and sign all signature fields in one save, with separate certificates and optional timestamps.
- [Overview](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/overview/llms.txt): What a PDF signature proves and what it doesn't, electronic and digital signatures, and the WPF parts: DigitalSignature, SignatureField and the ribbon tabs.
- [Signature Fields and Signature Appearance](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/signature-fields/llms.txt): Give each named field of a WPF TextControl its own DigitalSignature, pick its SignatureImage in an OpenFileDialog, set its export format and draw an SVG stamp.
- [Signing PDF Documents](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/signing/llms.txt): Save the WPF TextControl document or a merged DOCX template as a signed PDF: SaveSettings.DigitalSignature, byte arrays, errors and signature verification.
- [Timestamp Configuration](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/timestamps/llms.txt): Set up trusted RFC 3161 timestamps in WPF: the timeServerURL parameter, fallback time servers, an offline computer, signature fields and PAdES-T profiles.

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## Nearby

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