PdfTools.Pdf2Pdf (nuget): 3-Heights® PDF to PDF/A Converter is a fast and robust API for converting PDF documents to PDF/A and adding PDF/A-conform long-term digital signatures (PAdES). All established PDF/A conformance parts (PDF/A-1, PDF/A-2, PDF/A-3) and their levels are supported.   Ideal for automating your business processes. Suitable for single and bulk document processing.  PDF software by developers for developers   • Monthly feature releases   • No external dependencies   • Comprehensive manual and code samples  Visit our website to get your free evaluation license now.   • Fully functional 30-day trial   • Free support directly from our developers during the evaluation period
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