📎 PDF Merge

Combine multiple PDF files into one. Reorder pages before merging. 100% client-side — files never leave your device.

PDF Tools ✓ 100% Free ✓ No Signup ✓ Files Never Uploaded

How to Use the PDF Merge

Follow these steps for best results.

1
Select your PDF files
Click the upload area or drag and drop multiple PDF files. You can add up to 20 PDFs at once.
2
Reorder if needed
Drag the file cards to rearrange the order they will appear in the merged PDF. Remove any files you do not want included.
3
Merge and download
Click Merge PDFs and your combined document downloads immediately. No data is sent to any server.

Why Use This Tool?

Merging PDFs is one of the most common daily tasks for office workers, students, and professionals. Contracts, invoices, reports, and scanned documents all need combining regularly. Most online tools upload your files to a cloud server — this tool does everything inside your browser using PDF-lib, a proven client-side library. Your documents never leave your device, making it safe for confidential files, legal documents, and financial records.

Frequently Asked Questions

Is there a file size limit?
There is no hard server-side limit since all processing happens in your browser. Very large files (100MB+) may be slow depending on your device's memory. For best performance keep individual files under 50MB.
Can I merge password-protected PDFs?
This tool can merge read-only protected PDFs. Password-encrypted PDFs that require a password to open cannot be merged without first removing the password.
Does the order of files matter?
Yes — files appear in the merged PDF in the order shown in the queue. Drag the cards to reorder before merging.
Are my PDF files stored anywhere?
No. Files are loaded into your browser's memory, processed locally using PDF-lib, and automatically cleared when you close or refresh the page. Nothing is uploaded.
Can I merge more than two PDFs?
Yes — you can merge up to 20 PDF files in a single operation.

About PDF Merge

PDF merging is the process of combining two or more separate PDF documents into a single, continuous file. It is one of the most frequently needed document operations in professional environments — combining invoice batches, assembling multi-chapter reports, consolidating signed agreement pages, or packaging scanned receipts for expense claims. This tool uses PDF-lib, a fully open-source JavaScript library that runs entirely in your browser, to read each PDF's page structure and assemble them into a new document without re-rendering or quality loss.

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