PDF Merger
Combine multiple PDF files into one — in your browser.
100% client-side — your data never leaves your browser.
Drop PDF files here, or click to upload
Select multiple PDFs — they'll merge in the order shown below
About the PDF Merger
Merge PDF files online for free, with no upload required. Drop in as many PDFs as you need, drag them into the perfect order, and download a single combined document — all processed locally in your browser for complete privacy.
How to use the PDF Merger
- 1Drag and drop your PDF files, or click to choose them from your device.
- 2Reorder the files by dragging them up or down in the list.
- 3Remove any files you don't need with the × button.
- 4Click “Merge & download” to save the combined PDF.
Why use our PDF Merger
Unlimited files
Combine as many PDFs as your browser memory allows, in any order.
Drag-to-reorder
Arrange the merged document exactly how you want with a simple drag.
Fully client-side
Powered by pdf-lib — your documents never leave your computer.
No watermarks
Free forever, no sign-up, and absolutely no watermarks added to your file.
Frequently asked questions
Are my PDF files uploaded to a server?+
No. The merging happens entirely in your browser using the pdf-lib library. Your documents are never transmitted, stored, or seen by anyone but you.
Is there a limit to how many PDFs I can merge?+
There's no hard cap. The practical limit depends on your device's memory — most modern computers can comfortably merge dozens of typical PDFs.
Will the merged PDF preserve the original formatting?+
Yes. Pages are copied byte-for-byte, so fonts, images, and layout in every source PDF are preserved exactly in the output.
Does the merger add a watermark?+
Never. The combined PDF contains only your original pages — no SwiftTooly branding, no watermarks, no extra pages.