---
title: "Merge PDFs in C# .NET — Combine multiple PDFs | Nutrient .NET SDK"
canonical_url: "https://www.nutrient.io/guides/dotnet/editor/merge-or-combine/"
md_url: "https://www.nutrient.io/guides/dotnet/editor/merge-or-combine.md"
last_updated: "2026-05-20T19:49:34.791Z"
description: "Learn how to merge and combine multiple PDF documents in C# using Nutrient .NET SDK. Simplify your PDF management programmatically."
---

# Merge PDFs in C#

Nutrient.NET SDK (formerly GdPicture.NET) enables you to merge several documents in different formats into a single PDF document. For more information, see the [list of supported file formats](https://www.nutrient.io/guides/dotnet/about/file-type-support.md).

To merge several documents into a single PDF, use the `GdPictureDocumentConverter` class. You can also choose the PDF conformance level.

The code below converts a JPG image and a XLSX document into a single PDF of the 1.5 standard:

### C#

```csharp

using GdPictureDocumentConverter gdpictureConverter = new GdPictureDocumentConverter();
IEnumerable<string> source = new List<string>(new string[] { @"C:\temp\source1.jpg", @"C:\temp\source2.xlsx" });
gdpictureConverter.CombineToPDF(source, @"C:\temp\output.pdf", PdfConformance.PDF1_5);

```

### VB.NET

```vb

Using gdpictureConverter As GdPictureDocumentConverter = New GdPictureDocumentConverter()
    Dim source As IEnumerable(Of String) = New List(Of String)(New String() {"C:\temp\source1.jpg", "C:\temp\source2.xlsx"})
    gdpictureConverter.CombineToPDF(source, "C:\temp\output.pdf", PdfConformance.PDF1_5)
End Using

```

#### Used methods

- [`CombineToPDF`](/api/gdpicture/GdPicture.NET.14~GdPicture14.GdPictureDocumentConverter~CombineToPDF.html)
---

## Related pages

- [Add an image to another image using C#](/guides/dotnet/editor/add-image-to-image.md)
- [Add a page to a PDF or a TIFF image in C# .NET](/guides/dotnet/editor/add-page.md)
- [Add an image to a PDF using C#](/guides/dotnet/editor/add-image-to-pdf.md)
- [Add text to PDFs in C#](/guides/dotnet/editor/add-text-to-pdf.md)
- [PDF and image editor in C#.NET](/guides/dotnet/editor.md)
- [Add text to an image using C#](/guides/dotnet/editor/add-text-to-image.md)
- [Attach a file to a PDF in C#](/guides/dotnet/editor/attach-a-file.md)
- [Edit IPTC metadata using C#](/guides/dotnet/editor/metadata-iptc.md)
- [Modify EXIF metadata using C#](/guides/dotnet/editor/metadata-exif.md)
- [Read and edit PDF page label metadata using C#](/guides/dotnet/editor/metadata-pdf-page-label.md)
- [Read and edit PDF XMP metadata using C#](/guides/dotnet/editor/metadata-xmp.md)
- [Add watermarks to PDFs and images in C#](/guides/dotnet/editor/watermark.md)
- [Split PDF pages into multiple pages in C#](/guides/dotnet/editor/split.md)