How to combine PDF files into a big one on a PC?

PDFsam Basic is an open-source desktop PDF tool that offers a secure, offline way to combine pdf pages without uploading files to a cloud server; all editing operations are performed locally on your device.

How to Combine PDF Pages

Step 1: Download and install the software from the official website

Step 2: Launch the program and select the Merge feature

Step 3: Click the Add button and select all target PDF files

Step 4: Drag and drop items in the list to reorder the files

Step 5: Click Browse to specify the save location for the merged PDF file

Step 6: Click the “Run” button to start the merging process

Finally, wait for the task to complete; the complete merged PDF file will be saved locally

Processing time: About 30 seconds for 10 files; about 1–2 minutes for 50 files

It supports batch file import and manual page sorting, providing a reliable local solution for handling sensitive and private PDF documents.

Pros

• Supports batch processing; a single task can merge more than 100 PDF files
• Supports drag-and-drop reordering, allowing you to control the order of pages and documents
• Preserves the original image, text, and formatting quality of the source PDF documents

Cons

• Offers only basic PDF merging and splitting functions; lacks advanced editing tools such as OCR or annotations
• Processing large numbers of high-resolution PDF files significantly increases processing time
• No cloud synchronization feature; all PDF files must be stored on a local storage device in advance