devexpress-office-file-api-pdf

Use PdfDocumentProcessor.CreateEmptyDocument to start a new file, draw content with PdfGraphics via CreateGraphicsPageSystem, then call RenderNewPage for each page. Install the DevExpress.Document.Processor NuGet package and add DevExpress.Pdf.SkiaRenderer on .NET 6+.

Create an empty document with PdfDocumentProcessor.CreateEmptyDocument, then call AppendDocument for each source PDF. AppendDocument copies pages along with bookmarks, forms, hyperlinks, and attachments, and the file is finalized when the processor is disposed.

Yes, it supports .NET Framework 4.6.2 and higher using GDI+ for rendering, so the DevExpress.Pdf.SkiaRenderer package is not required. On .NET 6 and later, Skia-based cross-platform rendering is used instead.

Use PdfDocumentSigner with a Pkcs7Signer created from your PFX file and password, then bind it to a signature field via PdfSignatureBuilder. PAdES-BES profiles, TSA timestamps, and deferred signing with Azure Key Vault are also supported.

Blank pages occur when graphics are drawn but RenderNewPage is never called on the PdfDocumentProcessor. Each page requires its own PdfGraphics instance followed by an explicit RenderNewPage call to append the rendered content.

No, the PDF Document API extracts only programmatic text layers, not image-based content from scanned documents. For scanned PDFs, a separate OCR library is required to recognize text before extraction.