PDF Merger Tool

Merge multiple PDF files into one PDF document, with support for custom file ordering

791 uses | 5.0 rating

Merge Settings

Merge Options

Remove Duplicate Pages

Compress Output File

Select PDF Files (Multiple Selection Supported)

Drag and drop PDF files here, or

Merge Result

Not Processed

Please upload and merge PDF files to view results

Usage Instructions

Select PDF Files

Drag and drop PDF files to the upload area or click the browse button to select multiple PDF files.

Adjust File Order

Drag and drop file items in the file list to adjust the merging order.

Set Merge Options

Choose whether to remove duplicate pages or compress the output file as needed.

Merge PDFs

Click the "Merge PDFs" button, and the system will merge all PDF files in the specified order.

Download Result

After merging is complete, you can view file information and download the merged PDF file.

PDF Basics

Introduction to PDF Format

What is PDF

PDF (Portable Document Format) is a portable document format developed by Adobe Systems for reliably presenting and exchanging documents independent of software, hardware, or operating systems.

PDF Features

PDF preserves the original format, fonts, images, and layout of documents, supports encryption, digital signatures, and interactive elements, making it suitable for document sharing and archiving.

PDF Versions

The PDF format has evolved from the initial version 1.0 to the latest version 2.0, with each version adding new features and improvements to ensure broad compatibility.

Common Scenarios for PDF Merging

Document Management

Merge multiple related documents (such as project reports, contract attachments) into one file for easier organization and sharing.

Electronic Archiving

Merge scattered files for unified archiving, saving storage space and improving retrieval efficiency.

Form Submission

Merge multiple form pages or related materials into a complete submission file.

E-book Creation

Merge multiple chapters or articles into a complete e-book for easy reading and distribution.

Best Practices for PDF Merging

Check the integrity of each PDF file before merging to ensure no corrupted pages or files.
Pay attention to file order, especially for multi-page documents or materials that need to be read in a specific sequence.
For large files, consider compressing individual files before merging to reduce the final file size.
After merging, check the generated PDF to ensure correct page order and clear readability of images and text.

Frequently Asked Questions

Why did the merged PDF file become larger?

When merging PDFs, all file contents are preserved, including images, fonts, and formatting information. If source files contain high-quality images or embedded fonts, the merged file size may increase.

Will merging PDFs affect the original files?

No. This tool processes files in the browser and will not modify or delete original files on your computer. The merge operation only generates a new PDF file.

Why can't some PDF files be merged?

It may be because the PDF files are password-protected, have incompatible formats, or are corrupted. Try unlocking protected files first, or use other tools to repair corrupted PDFs.

What should I note when merging a large number of PDF files?

Merging a large number of files may take a long time and consume more browser memory. It is recommended to merge large file sets in batches for a better performance experience.