IronPDF How-Tos Merge PDFs Merge PDF Files into a Single PDF Using Python Chaknith Bin Updated:July 28, 2025 The PDF format, which stands for Portable Document Format, is widely used for displaying text and graphics in a consistent manner across different platforms and software applications. Python, being a high-level programming language, offers versatility and ease of use when it comes to working with various computer systems. However, handling source PDF files and input streams can present challenges in Python. Fortunately, IronPDF, a Python library, provides a convenient solution for effortlessly manipulating and working with existing PDF files. In this guide, we will walk you through the process of installing the IronPDF for Python library and demonstrate how to merge multiple PDF documents into a single PDF file. How to Merge PDF Files in Python Install the Python library for merging PDF files Utilize the RenderHtmlAsPdf method to generate individual PDF files Use the Merge method in Python to combine the generated PDF files Save the merged PDF document using the SaveAs method Merge more than two PDFs by creating a list of PDF objects and using the Merge method IronPDF: Python Library IronPDF is a powerful Python library for PDF operations. It enables you to create, read, and edit PDF files effortlessly. With IronPDF, you can generate PDFs from scratch, customize their appearance using HTML, CSS, JavaScript, and add metadata such as titles and author names. Notably, IronPDF allows seamless merging of multiple PDF files into a single destination file. It offers a self-contained solution without relying on external frameworks. Moreover, IronPDF is designed to be cross-platform compatible, supporting Python 3.x on Windows and Linux. This ensures that you can leverage its functionality regardless of your operating environment. Install IronPDF via Pip To install the IronPDF library using pip, execute the following command: pip install ironpdf In your Python script, make sure to include the following import statements to utilize IronPDF's functions for generating and merging PDF files: from ironpdf import * from ironpdf import * PYTHON Merge Two PDF Files in Python using IronPDF Merging PDF Files with the example below involves two steps: Creating the PDF files Merging them into a single final PDF file Here is a code sample that demonstrates the process: # HTML content for the first PDF html_a = """<p> [PDF_A] </p> <p> [PDF_A] 1st Page </p> <div style='page-break-after: always;'></div> <p> [PDF_A] 2nd Page</p>""" # HTML content for the second PDF html_b = """<p> [PDF_B] </p> <p> [PDF_B] 1st Page </p> <div style='page-break-after: always;'></div> <p> [PDF_B] 2nd Page</p>""" # Initialize ChromePdfRenderer renderer = ChromePdfRenderer() # Convert HTML to PDF documents pdfdoc_a = renderer.RenderHtmlAsPdf(html_a) pdfdoc_b = renderer.RenderHtmlAsPdf(html_b) # Merge the PDF documents merged = PdfDocument.Merge([pdfdoc_a, pdfdoc_b]) # HTML content for the first PDF html_a = """<p> [PDF_A] </p> <p> [PDF_A] 1st Page </p> <div style='page-break-after: always;'></div> <p> [PDF_A] 2nd Page</p>""" # HTML content for the second PDF html_b = """<p> [PDF_B] </p> <p> [PDF_B] 1st Page </p> <div style='page-break-after: always;'></div> <p> [PDF_B] 2nd Page</p>""" # Initialize ChromePdfRenderer renderer = ChromePdfRenderer() # Convert HTML to PDF documents pdfdoc_a = renderer.RenderHtmlAsPdf(html_a) pdfdoc_b = renderer.RenderHtmlAsPdf(html_b) # Merge the PDF documents merged = PdfDocument.Merge([pdfdoc_a, pdfdoc_b]) PYTHON In the provided code, two HTML strings are created, each representing content spanning two pages. The RenderHtmlAsPdf method from IronPDF is used to convert both HTML strings into separate PDF documents as PdfDocument objects. To merge the PDF files, the PdfDocument.Merge method is utilized. It merges the two PDF documents into a single PDF document by combining the contents of the PdfDocument objects into a new PdfDocument. Save Merged Multiple PDF Document To save the merged PDF file to a specific destination file path, you can use the following concise one-liner: # Save the merged PDF document merged.SaveAs("Merged.pdf") # Save the merged PDF document merged.SaveAs("Merged.pdf") PYTHON The output of the merged PDF file is shown below: Merge Two PDF Documents Merge More Than Two PDF Files To merge more than two PDF documents in Python using IronPDF, you can follow these two simple steps: Create a list and add the PdfDocument objects of the PDFs you want to merge Pass this list as a single argument to the PdfDocument.Merge method The code snippet below illustrates the process: # HTML content for the first PDF html_a = """<p> [PDF_A] </p> <p> [PDF_A] 1st Page </p> <div style='page-break-after: always;'></div> <p> [PDF_A] 2nd Page</p>""" # HTML content for the second PDF html_b = """<p> [PDF_B] </p> <p> [PDF_B] 1st Page </p> <div style='page-break-after: always;'></div> <p> [PDF_B] 2nd Page</p>""" # HTML content for the third PDF html_c = """<p> [PDF_C] </p> <p> [PDF_C] 1st Page </p> <div style='page-break-after: always;'></div> <p> [PDF_C] 2nd Page</p>""" # Initialize ChromePdfRenderer renderer = ChromePdfRenderer() # Convert HTML to PDF documents pdfdoc_a = renderer.RenderHtmlAsPdf(html_a) pdfdoc_b = renderer.RenderHtmlAsPdf(html_b) pdfdoc_c = renderer.RenderHtmlAsPdf(html_c) # List of PDF documents to merge pdfs = [pdfdoc_a, pdfdoc_b, pdfdoc_c] # Merge the list of PDFs into a single PDF pdf = PdfDocument.Merge(pdfs) # Save the merged PDF document pdf.SaveAs("merged.pdf") # HTML content for the first PDF html_a = """<p> [PDF_A] </p> <p> [PDF_A] 1st Page </p> <div style='page-break-after: always;'></div> <p> [PDF_A] 2nd Page</p>""" # HTML content for the second PDF html_b = """<p> [PDF_B] </p> <p> [PDF_B] 1st Page </p> <div style='page-break-after: always;'></div> <p> [PDF_B] 2nd Page</p>""" # HTML content for the third PDF html_c = """<p> [PDF_C] </p> <p> [PDF_C] 1st Page </p> <div style='page-break-after: always;'></div> <p> [PDF_C] 2nd Page</p>""" # Initialize ChromePdfRenderer renderer = ChromePdfRenderer() # Convert HTML to PDF documents pdfdoc_a = renderer.RenderHtmlAsPdf(html_a) pdfdoc_b = renderer.RenderHtmlAsPdf(html_b) pdfdoc_c = renderer.RenderHtmlAsPdf(html_c) # List of PDF documents to merge pdfs = [pdfdoc_a, pdfdoc_b, pdfdoc_c] # Merge the list of PDFs into a single PDF pdf = PdfDocument.Merge(pdfs) # Save the merged PDF document pdf.SaveAs("merged.pdf") PYTHON In the above code, three PDF documents are generated using the HTML render method. Afterward, a new list collection is created to store these PDFs. This list is then passed as a single argument to the merge method, resulting in the merging of the PDFs into a single document. Merge More Than Two PDF Files Conclusion This article provides a comprehensive guide on merging PDF files using IronPDF for Python. We begin by discussing the installation process of IronPDF for Python. Then, we explore a straightforward approach to generate PDFs using the HTML rendering methods. Additionally, we delve into merging two or more PDFs into a single PDF file. With its efficient performance and precise execution, IronPDF proves to be an excellent choice for working with PDF files in Python. Leveraging the capabilities of IronPDF for .NET, the library enables seamless conversion from HTML/URL/String to PDF. It supports popular document types such as HTML, CSS, JS, JPG, and PNG, ensuring the production of high-quality PDF documents. Built using cutting-edge technology, IronPDF stands as a reliable solution for your PDF-related tasks in Python. To gain further insights into utilizing IronPDF for Python, you can explore our extensive collection of Code Examples. IronPDF offers free usage for development purposes and provides licensing options for commercial applications. For detailed information about licensing, kindly visit the following link. Download the software product. Frequently Asked Questions How can I merge PDF files in Python? To merge PDF files in Python, you can use IronPDF. First, generate individual PDFs using the RenderHtmlAsPdf method, and then use the PdfDocument.Merge method to combine them into a single document. Finally, save the merged PDF using the SaveAs method. How do I install IronPDF for Python? You can install IronPDF using the pip package manager with the command pip install ironpdf. Once installed, import it into your Python script with from ironpdf import *. Can I merge more than two PDFs using Python? Yes, with IronPDF, you can merge more than two PDFs. Create a list of PdfDocument objects for all the PDFs you want to merge and pass this list to the PdfDocument.Merge method. What are the advantages of using IronPDF for PDF manipulation in Python? IronPDF provides a robust solution for creating, editing, and merging PDF files. It supports HTML, CSS, and JavaScript, allowing for high customization. It is efficient and cross-platform, supporting Python on both Windows and Linux. Is IronPDF free to use for development? IronPDF can be used for free during development. However, for commercial use, you will need to explore their licensing options. How do I save a PDF after merging it in Python? After using IronPDF's PdfDocument.Merge to combine PDF files, save the resulting document with the SaveAs method, specifying the desired file path. What file formats does IronPDF support for PDF generation? IronPDF supports generating PDFs from HTML, CSS, and JavaScript content. It allows the conversion of HTML/URL/String input into high-quality PDF documents. Where can I find examples of using IronPDF for PDF tasks in Python? You can find a variety of code examples and detailed tutorials on the IronPDF website under the 'Code Examples' section. How does IronPDF ensure cross-platform compatibility for Python applications? IronPDF is designed to be compatible with Python 3.x on both Windows and Linux platforms, making it a versatile choice for cross-platform PDF operations. Chaknith Bin Chat with engineering team now Software Engineer Chaknith works on IronXL and IronBarcode. He has deep expertise in C# and .NET, helping improve the software and support customers. His insights from user interactions contribute to better products, documentation, and overall experience. Ready to Get Started? Free pip Install View Licenses