# PDF/A

> Create PDF/A-3a documents for long-term archiving with AdobePDFA: PDF/A levels, font embedding and AdaptFont, restrictions, e-invoices, PDF/UA and signatures.

- **Product:** TX Text Control .NET Server
- **Section:** Documentation
- **Kind:** Topic
- **Path:** TX Text Control .NET Server > PDF Processing > PDF/A
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/pdf-a/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/pdf-a/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/pdf-a/llms-full.txt

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## On This Page

- [What PDF/A Is](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/pdf-a/#what-pdf-a-is)
- [What TX Text Control Writes](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/pdf-a/#what-tx-text-control-writes)
- [The Rules of PDF/A](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/pdf-a/#the-rules-of-pdf-a)
- [Control Which Fonts Replace Others](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/pdf-a/#control-which-fonts-replace-others)
- [Electronic Invoices](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/pdf-a/#electronic-invoices)
- [PDF/A, PDF/UA and Digital Signatures](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/pdf-a/#pdf-a-pdf-ua-and-digital-signatures)
- [Next Steps](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/pdf-a/#next-steps)

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## Nearby

- **Previous:** [PDF Conversion](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/conversion/llms.txt)
- **Next:** [PDF/UA](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/pdf-ua/llms.txt)