iTextSharp.PdfHelpers 1.0.0

PdfHelpers.Resize

Lightweight Helper Library for performing tasks on Pdf files such as: scaling and resizing Pdf Documents and Pages of existing Pdf documents, converting Images into Pdf format, and merging Pdf Documents as well as merging Images into Existing Pdf documents. It leverages iTextSharp for core work but offeres a easy wrapper for common resizing, conversion, and merging needs. In addition, this library is intented to help simplify the task of rendering Pdf based outputs/reports and works best when combined with a template based Pdf Rendering process such as the one here that allows use of Razor templates to render Pdf files.

It's as easy as . . .

Sample for Resizing Pdf Content:

byte[] pdfBytes = File.ReadAllBytes("...path to pdf...");
var targetSizeInfo = new PdfResizeInfo(PageSize.POSTCARD, PdfMarginSize.None);
byte[] scaledPdfBytes = PdfResizeHelper.ResizePdfPageSize(pdfBytes, targetSizeInfo, PdfScalingOptions.Default)

PdfHelpers.Convert

Set of helpers for converting common things into Pdf (e.g. converting an Image into Pdf for mergeing/Combining into other Pdf documents.

Sample for Converting Image to Pdf Document:

var imageBytes = File.ReadAllBytes("...path to valid Image...");
var pageSizeInfo = new PdfResizeInfo(PageSize.POSTCARD, PdfMarginSize.None);
var pdfBytes = PdfConvertHelper.ConvertImageToPdf(imageBytes, pageSizeInfo, PdfScalingOptions.Default);

PdfHelpers.Merge

Set of helpers for merging Pdf documents together into one output Pdf. When combined with the Convert helper above it's easy to append Image files onto an existing Pdf).

NOTE: This uses the PdfSmartCopy underlying copier to merge the documents. Therfore, assuming they haven't been scaled/resized the annotations and dynamic elements will be preserved. This also enables the output document to be optimized without unnecessary duplicate references to embedded elemetns such as Fonts.

Sample for Converting Image to Pdf Document:

var pageSizeInfo = new PdfResizeInfo(PageSize.POSTCARD, PdfMarginSize.None);

var pdfFileBytesList = new List<byte[]>() {
    File.ReadAllBytes("...path to pdf..."),
    PdfConvertHelper.ConvertImageToPdf("...path to valid Image 1...", pageSizeInfo),
    PdfConvertHelper.ConvertImageToPdf("...path to valid Image 2...", pageSizeInfo),
    PdfConvertHelper.ConvertImageToPdf("...path to valid Image 3...", pageSizeInfo),
};

var pdfBytes = PdfConvertHelper.MergePdfFiles(pdfFileBytesList, pageSizeInfo);

NOTES:

Loss of Interactive Elements from Pdfs:
iTextSharp does not allow manipulation of content when using the PdfCopy or PdfSmartCopy classes for Pdf merging, therefore the PdfWriter must be used to make changes to content such as scaling it -- as opposed to just adding overlay/underlay content. This has the side effect of causing loss of interactive functions of pages that are resized such as Annotations, Form Fields, etc. However for many use cases this is perfectly valid implilcation when resizing content as Annotations would lose their positions, and form fields could become unusable, etc. So for Read-only content the concept of scaling/re-sizing will work with the approach used here.

Additional information: Great overview of merging and manipulating Pdfs with iTextSharp (e.g. iText) can be found in the free online book chapter -- written by the authoer of iText -- here:
https://livebook.manning.com/book/itext-in-action-second-edition/chapter-6/

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