Merge PDF
Two documents or two hundred into one, in the order you drag them into, with a bookmark naming each piece. Take only part of any of them if you like.
- No uploads
- No sign-up
- No file limit
- No watermark
nothing was uploaded
Why merging is not a conversion
Nothing is converted here, which is why nothing is lost. A PDF is a set of numbered objects with a page tree on top, so combining two documents means copying the objects one of them needs into the other, renumbering the references so they still point at the right things, and hanging the copied pages off a single tree. The text is the same text, the fonts are the same fonts, the images are the same images at the same resolution.
That is also why a merged file is roughly the size of its parts added together, and why merging then splitting gets you back where you started. What a PDF actually is has the structure in more detail if the object graph sounds abstract.
Bookmarks, which almost nothing free adds
A merged document is a pile unless something tells you where the joins are. So the result gets an outline: one entry per file it was made from, pointing at the first page that file contributed. Open it in any reader and the sidebar lists the pieces by name, and clicking one jumps there.
For a set of invoices, a bundle of evidence, a term of lecture notes or an application pack, that is the difference between a document you scroll through and one you navigate. It is on by default, and there is a tick box if you would rather not have it.
Assembling, not just merging
The job is rarely "all of these, in this order". It is usually "all of that one, pages 2 to 4 of this one, and the signature page from that". So every file has a pages box: leave it empty for the whole thing, or type the pages the way you would say them out loud, 1-3, 7, or 12- for everything from page twelve on.
Each file also has its own rotate button, which adds a quarter turn to every page it contributes. A scan that came in sideways is fixed without touching the others.
The limits everyone else has, and why
Most free mergers stop you at two or three files, or at 20 MB, or ask you to sign in for more. That is not a technical limit, it is a bill: they are uploading your documents to a machine they pay for, so every file costs them money and the cap is where the free tier stops.
There is no server here, so there is nothing to meter. The real limits are your own device's memory on a very large batch and the few seconds a long document takes to open. Nothing is counted, nothing expires, and there is no watermark.
Locked documents, and signatures
A password-protected PDF cannot be merged while it is locked. Its contents are encrypted, and rearranging encrypted streams produces a file of noise rather than a document. Open it in your reader, enter the password, save an unlocked copy, and merge that.
Digital signatures are a related case with a different answer. A signature covers the exact document it was applied to, so any change at all, including being merged into a larger file, breaks it. That is not a limitation of this tool, it is what a signature is for: every merge tool in existence does the same thing.
The documents people merge
Contracts, invoices, bank statements, mortgage applications, medical records, visa packs, scans of passports and driving licences. It is the most sensitive category of file most people own, and it is routinely pasted into free websites that upload it, process it on a machine nobody can inspect, and keep it for a while.
Nothing here leaves the tab. You can check that the way you should check any site that claims it: load this page, switch the browser to offline, and merge some documents anyway. How to check a site is not uploading your files.
Nearby
Split PDF goes the other way, compress PDF is the page for a merged file that is now too big to email, and image to PDF is where to start if the pieces are photographs rather than documents.
Guides that go further
Part of pictures and pdfs. What each format is, when to use it, and what to do when a file will not open.
- What is a PDF, and why does it look the same everywhere?What a PDF really is: not a picture, but a set of drawing instructions with the fonts packed in. Why it looks identical everywhere, and what that costs you.
- How to get the images out of a PDFTwo different jobs hide behind this: rendering pages as pictures, and pulling out the original images placed inside. Which you need, and how to do each.
- Is it safe to upload photos to online converters and background removers?Is CloudConvert safe? Is remove.bg safe? What CloudConvert, Convertio, ezgif, remove.bg and Photoroom say about your uploads, checked 16 September 2026.
- How to turn a picture into a PDF, on any deviceTurn photos into a PDF on iPhone, Android, Windows, Mac or in a browser, and put several into one document. The built-in way on each, and what each gets wrong.
Questions
How do I merge PDF files into one?
Drop them all on this page, drag them into the order you want, and click Save merged PDF. Each file shows its first page, so you can check the order by looking rather than by reading names. It happens in your browser: nothing is uploaded, there is no account and no limit on how many files go in.
Is there a limit on the number or size of files?
No. The tools that cap you at two or three files, or at 20 MB, do it because they are paying for a server to hold your documents. Here the work happens on your own machine, so the only limits are its memory and the few seconds a very large document takes to open.
Can I take only some pages from each file?
Yes. Each file has a pages box: leave it empty for the whole document, or type 1-3, 7 or 12- to take part of it. That is the difference between merging and assembling, and it saves splitting the files first.
Does merging reduce the quality?
No. The pages are copied from one document into another as objects, not redrawn: the same text, the same fonts, the same images at the same resolution. A merged file is usually about the size of its parts added together.
What are the bookmarks it adds?
An outline with one entry per file it was made from, pointing at the first page that file contributed, so a reader's sidebar lists the pieces and you can jump between them. It is on by default and can be turned off. Very few free tools do this, and it is what makes a 200 page merge usable.
Can I merge a password-protected PDF?
Not directly. A locked document's contents are encrypted, so rearranging them without the password would produce a file of noise. Open it in your reader, enter the password, save or print an unlocked copy, and merge that.
Does it keep forms, links and signatures?
Links within a page are kept, and so is the page content exactly. Form fields and digital signatures are a different matter: a signature covers the document it was applied to, so any change to that document, including merging it into another, invalidates it. That is true of every merge tool, and it is the point of a signature.
Can I rotate pages while merging?
Yes, a quarter turn at a time, per file. The turn is added to whatever rotation the pages already had, so a file that was scanned sideways comes out the right way up without touching the others.
Is it safe to merge documents on a website?
It depends entirely on whether the site uploads them, and most do. The documents people merge are contracts, invoices, statements, applications and scans of identity papers, which is the worst possible category of file to hand to a stranger's server. Nothing here leaves the tab; you can check by going offline after the page has loaded and merging anyway.
Your files never leave this device
Most online converters upload every file to a server, convert it there and keep it for a while. Here your browser decodes and encodes the picture itself, so there is nowhere for the file to go. You can check it: load this page, switch the browser to offline, and convert a file. How to check a site is not uploading your photos.