365tools

Merge PDFs

Combine multiple PDF files into one. Drag rows to reorder pages.

Files processed in your browser — never uploaded

How PDF Merge Works

1

Add your PDF files

Drag and drop multiple PDFs onto the upload area, or click to browse. Add as many files as you need.

2

Drag to reorder

Reorder the files by dragging rows up or down. The merged PDF will follow this exact order.

3

Download merged PDF

Click Merge and download the combined PDF file instantly. No waiting, no email required.

Key Features

Unlimited Files

Merge as many PDF documents as you need in one operation. No artificial caps on the number of files.

Drag-to-Reorder

Reorder your PDFs by dragging the rows before merging. The output will match your specified order exactly.

Instant Processing

All merging happens in-browser using pdf-lib. Even large documents are processed quickly with no queue.

100% Private

Your PDF contents never leave your device. Perfect for confidential contracts, medical records, or financial documents.

All Pages Preserved

All pages from all source documents are included in the merged output. No pages are skipped or resampled.

One-Click Download

The merged PDF is instantly available for download as a single file with a sensible filename.

Frequently Asked Questions

Q
How many PDF files can I merge at once?
A
There is no limit on the number of files. You can merge 2, 10, or 50 PDFs in a single operation. The only practical constraint is your device's available memory.
Q
Can I reorder pages before merging?
A
Yes. Each file is listed as a draggable row. Drag the rows up or down to set the order. The merged document will follow this order exactly — all pages from the first file, then all pages from the second, and so on.
Q
Will the merged PDF lose quality?
A
No. The merger uses pdf-lib which copies pages structurally — fonts, images, vector graphics, and metadata are all preserved at their original quality. No re-rendering or compression is applied to the content.
Q
Does this work with password-protected PDFs?
A
No. Password-protected (encrypted) PDFs cannot be merged without first removing the password protection. You will need to unlock the PDF using the original password before merging.
Q
Are my PDFs uploaded to a server?
A
No. Merging is performed entirely in your browser using the open-source pdf-lib library. Your PDF files never leave your device.
Q
What is the maximum file size I can merge?
A
There is no server-imposed size limit. Merging large PDFs requires enough browser memory. Most modern computers can handle documents totalling several hundred megabytes without issue.

Next Step — Compress or Split Your PDF

Compress PDF

Reduce PDF file size in your browser. See exact savings before downloading.

Split PDF

Extract specific pages or split a PDF into individual files by page range.

Image Converter

Convert between PNG, JPG, WebP, AVIF, GIF, and BMP with quality control.