A Guide to Open Source PDF Merger

April 7, 2023 2.4K views

Open source PDF merger software provides a cost-effective and customizable solution for users who need to merge multiple PDF files into a single document. Whether you're looking for a free and easy-to-use option or a more advanced PDF merger, there's something out there for you. In this article, we'll explore the top open source PDF merger software options, including WPS PDF, and highlight their features and benefits.


For those who need a professional-grade PDF merger software with advanced features, we recommend WPS PDF. This free and open-source software allows users to merge multiple PDF files offline, and it offers a range of other features, such as the ability to add watermarks, bookmarks, and digital signatures to PDF documents. WPS PDF has a user-friendly interface and is available for Windows, Mac, and Linux, making it a versatile and reliable option for all users.


  • WPS PDF Merger supports batch merging, which allows you to merge many PDF files at once, saving you time and effort.

  • The software offers a basic and intuitive interface, making it simple to use even for those unfamiliar with PDF editing tools.


  • WPS PDF Merger is free, making it an excellent choice for people who need to merge PDF files only periodically or on a tight budget.

  • The software protects your data with SSL encryption, guaranteeing that your files remain safe and secure.


  • WPS PDF Merger is a simple programme with limited features that may not be appropriate for complicated PDF editing jobs.

2. PDFsam Basic

PDFsam (PDF Split and Merge) is a free and open-source desktop application that lets you merge, split, and extract pages from PDF documents. PDFsam Basic is the free version of the software, which includes the basic functionality for merging PDFs. PDFsam Enhanced is a paid version that offers additional features such as encryption, conversion to other file formats, and OCR (optical character recognition).


  • PDF documents into a single file using PDF merging.

  • PDFSAM Simple Merger is compatible with Windows, Mac, and Linux.



  • You can only merge one PDF document at a time, which might be time-consuming if you have many to merge.


Oct 18, 2019 (Original Oct 16, 2019)

"I like its PDF Mix tool"

What do you like best about PDFsam Basic?

PDFSam Basic is based on a free, downloadable and installable application and for the purpose of my review, on Windows. PDFSam Basic includes tools such as PDF Merge, PDF Split, PDF Mix, PDF Rotate and PDF Extract. I liked the PDF file mixing tool that allows you to combine them into one by following some criteria or pattern that you can point out in its options menu. At first, implementing it can be somewhat complicated but the online help offered by PDFSam is very useful and with it, you can complete the task successfully.

3. Smallpdf

Smallpdf is a cloud-based PDF tool that lets you merge, compress, and convert PDF files, among other things. With Smallpdf, you can merge up to five PDFs for free. To merge PDFs with Smallpdf, upload the files to the website, rearrange their order if necessary, and click the "Merge PDF" button. Smallpdf will then combine the files into a single PDF document and provide you with a download link.


  • Easy-to-use drag-and-drop interface.


  • Because it is an online tool, there is no need for any software to be downloaded or installed.


  • The free edition includes a 100MB file size limit, which may not be sufficient for larger files.


Dec 15, 2022

"Quick and Super Easy to Convert&Edit PDF Files"

What do you like best about Smallpdf?

One click converts JPG to PDF. It is free of cost. We can also edit the PDF files. It is one stop for all your PDF problems

FAQs on Open Source PDF Merger

How do I combine open source PDF files?

You can use WPS PDF Editor to combine open source PDF files by following these steps:

  • On the home screen of WPS PDF Editor, click the "Merge PDF" button.

  • Click the "Add Files" button in the "Combine PDF Files" dialogue box to pick the PDF files to be combined. The files can also be dragged and dropped into the dialogue box.

  • Click the "Move Up" and "Move Down" buttons to arrange the PDF files in the order you want them to appear in the merged document.

  • By clicking the "Choose Pages" option, you can also select individual pages from each PDF file to include in the merged document.

  • Click the "Settings" button to choose the file name, page size, orientation, and compression parameters for the combined PDF file.

  • After you've chosen your settings, click the "Combine" button to generate the merged PDF file.

WPS PDF Editor will merge the selected PDF files into a single document and save it to the location specified in the output settings. Note that the options and steps may vary depending on the version of WPS PDF Editor you are using.

Is there a free PDF merger?

Yes, there are several free PDF mergers available online, such as PDFSam Basic and SmallPDF.

Why is WPS PDF the Best Option Available?

There are many options available when it comes to open source PDF merger software. Whether you need an offline or online solution, a free or more advanced software, or a solution for Windows, Mac, or iPhone, there's something out there for everyone. However, if you need a powerful, versatile, and easy-to-use PDF merger software, WPS PDF is the best option available. So, what are you waiting for? Download WPS PDF now and start merging your PDF files like a pro!

15 years of office industry experience, tech lover and copywriter. Follow me for product reviews, comparisons, and recommendations for new apps and software.