# Signature Validation

> Validate the signatures of PDF documents with TXTextControl.PDF.Validation: signature diagnostics, what they check, rejecting uploads and testing tampering.

- **Product:** TX Text Control .NET Server
- **Section:** Documentation
- **Kind:** Topic
- **Path:** TX Text Control .NET Server > Digital Signatures > Signature Validation
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/validation/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/validation/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/validation/llms-full.txt

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## On This Page

- [What a Validator Checks](https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/validation/#what-a-validator-checks)
- [What the Package Checks](https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/validation/#what-the-package-checks)
- [Check the Signatures of a PDF](https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/validation/#check-the-signatures-of-a-pdf)
- [Interpret the Results](https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/validation/#interpret-the-results)
- [Reject Uploads With Broken Signatures](https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/validation/#reject-uploads-with-broken-signatures)
- [Test That Tampering Is Detected](https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/validation/#test-that-tampering-is-detected)
- [Next Steps](https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/validation/#next-steps)

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## Nearby

- **Previous:** [Multiple Signatures](https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/multiple/llms.txt)
- **Next:** [Self-Signed Certificates](https://docs.textcontrol.com/tx-text-control-dotnet-server/digital-signatures/self-signed/llms.txt)