Merge PDF
Combine two or more PDF files into a single document. Drag to add, arrange the order, click merge — all in your browser.
How to merge PDF files
- Click Choose PDF files or drag your PDFs into the box above.
- Use the up and down arrows to put the files in the order you want, or remove a file with the cross button.
- Click Merge PDF and download the combined file.
Features
Private
Merging happens on your device. Nothing is uploaded.
Custom order
Arrange files exactly how you want them combined.
Original quality
Pages are copied losslessly — no recompression, no watermark.
Any device
Works on Windows, Mac, Linux, Android and iOS.
Frequently asked questions
Is it safe to merge confidential PDFs here?
Yes. The merge happens entirely in your browser using JavaScript. Your files are never uploaded to a server, so nobody but you can see them.
Is there a limit on the number or size of PDFs?
There is no fixed limit. Because processing happens on your device, very large files are limited only by your browser's memory. Hundreds of pages and files of several hundred megabytes usually work fine.
Can I change the order of the PDFs before merging?
Yes. After adding files, use the up and down arrows next to each file to arrange them. The merged PDF follows the order shown in the list.
Does merging reduce quality or add a watermark?
No. Pages are copied as-is, so text, images and vector graphics keep their original quality. Toolzuki never adds watermarks.