Merge PDF files without uploading them
Combine invoices, scans, statements or chapters into a single PDF. Everything is assembled on your own device, so confidential documents stay confidential.
Merge PDFs nowCombine documents without handing them over
Merging is the most common reason people reach for an online PDF tool, and it is usually the most sensitive: expense claims with bank details, medical scans, tax paperwork, signed agreements being bundled for an accountant. Every one of those is a file you would rather not upload to a stranger's server.
docu4all merges in the browser. You add as many PDFs as you like, they appear as one continuous document, and you download the combined file without any of it being transmitted.
Because the work happens locally, merging a large scan is limited only by your computer's memory rather than by an upload cap or a queue on somebody else's server.
How to do it, step by step
Open the first PDF
Drag it in or choose a file. Its pages appear in the page rail on the left.
Add the others
Click Add PDF and pick one or more files. Their pages are appended to the end of the document.
Put the pages in order
Drag any thumbnail up or down to reorder. Rotate anything that came in sideways, and delete pages you do not want.
Download the combined PDF
Hit Download and you get a single merged file, named after the document you opened first.
Merging scans and mixed page sizes
Merged documents often mix sources: a letter-size contract, an A4 statement and a phone photo of a receipt. docu4all keeps each page at its own dimensions rather than stretching everything to one size, so nothing is distorted or cropped.
If a scanned page arrives rotated, rotate it from its thumbnail before downloading. It is worth doing this before you add text or signatures, since rotating afterwards moves annotations with the page and is easier to get right in one pass.
Try it now — it is free
No account, no watermarks, and your file never leaves your device.
Merge PDFs nowFrequently asked questions
How many PDFs can I merge at once?
There is no fixed limit. Because merging happens on your device, the practical ceiling is your computer's memory rather than a server quota.
Can I change the page order after merging?
Yes. Drag the page thumbnails into any order before downloading, and delete any pages you do not need.
Are my files uploaded to merge them?
No. The merge happens in your browser, so the documents never leave your device.
Does the merged file have a watermark?
No. There are no watermarks and no sign-up.