Merge PDF files into one
Drop your PDFs in, put them in the order you want, and get a single document back. Nothing is uploaded; the whole merge runs inside this tab.
click to choose · or paste from the clipboard
Nothing here is uploaded. See how the page enforces it.
Order is the whole job
Merging is trivial arithmetic and entirely about sequence. Files arrive in the order you add them, and the arrows on each row move it up or down; the result is built top to bottom exactly as the list reads.
Every page of every input is carried across, along with its size and orientation. A merge of an A4 report and a landscape scan produces a document that changes shape halfway through, because that is what the pages are. Nothing is scaled or padded to make them uniform.
What survives the merge, and what does not
| Carried across | Dropped |
|---|---|
| Every page, at its original size and rotation | Bookmarks and the outline tree |
| Embedded fonts and images, untouched and not re-encoded | Form fields and their values |
| Internal page content exactly as it was | Document-level metadata from the inputs |
Pages are copied, not re-rendered, so nothing loses quality: a scanned page comes out byte-for-byte the same scan. That is also why the merged file is roughly the sum of the inputs, and no smaller.
Questions
+ Can I change the order after adding the files?
Yes. Each row has arrows to move it up or down, and a merged result is discarded the moment you reorder, so you can never download a file built from the previous order.
+ Does it work with password-protected PDFs?
No. Encrypted PDFs are refused, including files that open without asking but still carry owner-password restrictions. Remove the protection in a PDF app you trust, then add the unencrypted copy here. This page never asks for or stores a password.
+ Is there a limit on how many files?
No. Add two or two hundred. Large merges take a few seconds because the work is happening on your processor and not on someone else's.
+ Are my files uploaded anywhere?
No. The PDF is read and rewritten by your own browser. Open devtools, watch the Network tab while you run it, and nothing leaves. The page keeps working with your connection switched off, which is the part worth caring about when the document is a payslip, a contract or a medical letter.
+ Is there a size limit or a sign-up?
Neither. There is no server paying for your bandwidth, so there is nothing to meter. The practical ceiling is your own device's memory, which on a normal laptop means documents of several hundred megabytes.