- Dynamic XFA
- pdfkit5 and Xamarin
- Use multiple licenses
- Replace field with image
- Import FDF into PDF
- Embed TrueType font in PDF
- Determine if a PDF only contains images
- Download and convert image to PDF
- Use TrueType font collections
- Determine the content bounding box
- Highlight fields in PDF
- Add hyperlink to PDF
- Add Stamp to PDF
- How do I extract page destinations from bookmarks?
- Convert SVG to PDF
- Extract glyph boxes from PDF
- Fill in a template PDF document
- Extract graphics from PDF
- Flatten Markup Annotation
- Fill and save dynamic XFA form
- Clip PDF page content in C#
- How to scale content of PDF
- Use pdfkit5 with a Xamarin.Forms app
- Create tagged PDF
- Add single-line text to PDF
- Change the formatting of a numeric field
- Add bookmarks to PDF
- Convert PDF to plain text
- TIFF to PDF C#
- Add a note to PDF
- Add a link with an internal destination to PDF
- Create formfields in PDF documents
- Extract embedded files from PDF
- Remove graphics from PDF
- Fit image to PDF page
- Split PDF pages in C# and VB.NET
- Add tags to existing PDF
- pdfkit5 - detailed changes to the API - Tall Components
- Add a link to PDF with an external destination
- Translate PDF page content
- How to sign and verify updates to a PDF document
- Create a new digitally signed PDF document
- EMF to PDF as vector image
- Layout text with MultilineTextShape
- Add multiline text to a PDF document
- .NET Core console app on MacOS
- How to add autosized text to PDF
- How to generate and export certificates
- Write Document to HttpResponse
- Create rectangles with rounded corners
- Add barcodes to PDF
- Append two or more existing PDF files
- pdfkit5 and .NET Core
- Create a text annotation in PDF with rich text
- Rotate a PDF page
- Add text field to PDF
- Change the color inside a PDF
- How to embed files in a PDF document
- Merge XDP data with dynamic XFA form
- How to mirror PDF pages and other shapes
- Add a Diagonal Watermark to PDF in C# - TallComponents - PDF Library
- Read PDF tags
- How to reduce PDF file size
- Tagged PDF
- Read and write meta data from PDF
- Add footer to PDF
- Create a custom signature handler to sign and verify PDF documents
- Export FDF from PDF form
- Create text with decorations
- Fill XFA form and export XDP data
- Vector graphics in PDF
- Resize PDF pages
- Change page orientation PDF
- Reduce PDF size
- Crop content on a PDF page
- Extract glyphs and sort by reading order
- PDF Viewer Preferences
- Extract images from PDF
- Disable submit button after submitting
- How to downscale all images in a PDF
- Remove PDF security settings
- Merge PDF files in C# .NET
- Flatten PDF form
- Licensing and .NET Standard
- How to downscale all images in a PDF
- Fill PDF form
- pdfkit5 .NET Standard API
- Add a rubber stamp annotation with a custom icon
- Add Long Term Validation (LTV) data to an existing signature
- How to create a tiling for shapes in PDF
- Search text in PDF
- Digitally sign a PDF form in C# or VB.NET
- Add simple html text to PDF
Merge PDF files in C# .NET
Merge multiple PDF files into one using C#
In the following code sample you can see how you can easily merge PDF files into one. It creates a new document and then adds a clone of the pages from each input document. Please take note that the input files will not be read until they are needed, so you can only close the input files until a copy has been made by writing the new document to the disk. This is done for efficiency: if you import a 1000-page document and only need the first page containing a certain keyword, then the rest of the pages will not be processed.
C# code sample: merge PDF
// Find all pdf documents in input folder.
DirectoryInfo directoryInfo = new DirectoryInfo(@"..\..\..\inputdocuments");
FileInfo[] allPDFs = directoryInfo.GetFiles("*.pdf");
// Create a document for the merged result.
Document mergedDocument = new Document();
// Keep a list of input streams to close when done.
List<FileStream> streams = new List<FileStream>();
foreach (FileInfo fileInfo in allPDFs)
{
// Open input stream and add to list of streams.
FileStream stream = new FileStream(fileInfo.FullName, FileMode.Open, FileAccess.Read);
streams.Add(stream);
// Open input document.
Document document = new Document(stream);
// Append all pages to target document.
// The target document holds references to data in the input stream.
// For efficiency it does not copy this data so the input streams
// should not be closed before the merged document is saved.
mergedDocument.Pages.AddRange(document.Pages.CloneToArray());
}
// Save merged document.
using (FileStream output = new FileStream(@"..\..\output.pdf", FileMode.Create, FileAccess.Write))
{
mergedDocument.Write(output);
}
// Close all input streams.
streams.ForEach(stream => stream.Close());
VB.NET code sample: merge PDF
' Find all pdf documents in input folder.
Dim directoryInfo As New DirectoryInfo("..\..\inputdocuments")
Dim allPDFs As FileInfo() = directoryInfo.GetFiles("*.pdf")
' Create a document for the merged result.
Dim mergedDocument As New Document()
' Keep a list of input streams to close when done.
Dim streams As New List(Of FileStream)()
For Each fileInfo As FileInfo In allPDFs
' Open input stream and add to list of streams.
Dim stream As New FileStream(fileInfo.FullName, FileMode.Open, FileAccess.Read)
streams.Add(stream)
' Open input document.
Dim document As New Document(stream)
' Append all pages to target document.
' The target document holds references to data in the input stream.
' For efficiency it does not copy this data so the input streams
' should not be closed before the merged document is saved.
mergedDocument.Pages.AddRange(document.Pages.CloneToArray())
Next
' Save merged document.
Using output As New FileStream("..\..\output.pdf", FileMode.Create, FileAccess.Write)
mergedDocument.Write(output)
End Using
' Close all input streams.
For Each stream As Stream In streams
stream.Close()
Next