Merge PDF — one document instead of a stack of files
Upload your documents, put them in order and take the finished file. Pages carry over untouched: nothing is redrawn and nothing is compressed again.
- Files at once
- 20a contract with exhibits, a batch of scans
- Pages
- Untouchedno re-compression, no softening
Why merge PDFs
Documents almost never arrive as a single file. The agreement is one file, the exhibits another, and scans come one page per file because that is how the scanner or the phone left them. While that stack sits in your own folder it bothers nobody; the trouble starts the moment you have to send it to someone else.
One file is easier in every way: nothing gets lost on the way, the order cannot be scrambled, and nobody forgets to open the third attachment. Upload forms at banks and government portals frequently accept exactly one document rather than eight. Printing one file beats opening a stack in turn, too.
How to combine PDF files into one
The tool above works in three steps with nothing in between:
- Upload your documents — drag them into the field or pick them from the dialog. Take the whole batch at once or add files one at a time: new ones join what you already chose instead of replacing it;
- Put them in order. The list, top to bottom, is the page order of the finished document. Up and Down move a row, Remove drops what you do not need;
- Take the finished file. Merging takes a second, and the document is then yours to download.
You set the order, not the software
The list never sorts itself — not by name, not by date, not by size. That is deliberate: the correct order of documents cannot be guessed. Alphabetically, “Exhibit A” comes before “Agreement”, and a modification date tells you when a file was last re-saved rather than where it belongs in the document.
The order of rows in the list is the order of pages in the finished document. There is no other rule at work here.
So documents line up the way you brought them in, and move with buttons from there. Buttons rather than drag-and-drop: dragging would have to be mirrored with keyboard shortcuts, or the list would be unusable for anyone working from the keyboard. Up and Down behave the same everywhere — with a mouse, from the keyboard, and on a phone.
What happens to the pages
Merging is built differently from conversion, and the difference matters. A converter takes a page apart into pixels and builds an image back up — that step is where questions of quality and resolution come from. Merging never reaches pixels at all: the page moves into the new document whole, with its text, fonts and images.
Which leads to something worth stating plainly: a page in the finished file is not “almost the same”, it is the same. Text stays text — still selectable, still findable with search. Small type does not soften, thin drawing lines do not spread, and the document weighs roughly what the originals weighed together.
What carries over and what does not
An honest list of what survives merging and what does not:
| What | Carries over |
|---|---|
| Text, fonts and images | Yes — the page moves whole |
| Page size and orientation | Yes — each page keeps its own |
| Selectable, searchable text | Yes — text stays text |
| Bookmarks and outline | No — they belong to a document, not a page |
| Digital signature | No — it certifies the original file in full |
The last two rows deserve more detail, because they are the ones that surprise people.
An outline lives apart from the pages: it is a tree of links describing a whole document. With several documents, each brings its own tree and its own numbering, and merging them into one that still reads sensibly cannot be automated — somebody has to decide what became a section, what a subsection, and what to call it. That is a decision for a person, not a tool.
A digital signature attests that not one byte has changed since signing. Merging produces a new document — exactly the change a signature exists to catch. Every tool behaves this way, not just ours: if the document needs to be signed, sign the finished file after merging.
Limits
There are two, and both are about sensible use rather than computing power:
- Twenty documents at a time. A bigger pile usually means the document is better assembled in parts — which you can do right here: the finished file uploads straight back and merges with the rest;
- 64 MB for the whole batch. The limit is shared, not per file. For documents that is generous: a contract with exhibits rarely passes a couple of megabytes, and it is usually high-resolution scans that reach it.
Merging a second time costs nothing in quality: pages carry over untouched on the second round exactly as on the first, so a document can be assembled in parts without a second thought.
Mixed page sizes, scans and slides
Documents in one batch do not have to match. A4 and letter, portrait scans and landscape presentation slides all sit happily in one file: every page keeps its own size and orientation, and we make no attempt to force them into a common format.
This is a case where leaving things alone beats being clever. Forcing everything to A4 would mean rescaling somebody else’s pages, and on a drawing or a table that shows immediately. A document with pages of differing formats looks unusual, but it prints and reads fine, and the data inside it stays untouched.
What happens to your files
The documents you upload are never stored: they live in memory only for as long as the merge takes. The result has to go to disk — it is the thing we hand back to you — and it is swept by age after about half an hour, whether or not you collected it.
The link to the finished file is signed and lives exactly as long as the file does: it cannot be guessed, and it stops working once it expires. We keep no download history and ask for no sign-up — the site has no accounts at all.
Merging is free in full: no paid tiers, no subscription, no limits that lift if you pay. There are no watermarks either — nothing stamped across the pages and no site address in the corner of the result.
How do I merge several PDFs into one file?
Upload your documents into the field above — pick several at once or drag them in. They line up in the order they arrived; the Up and Down buttons move a row, Remove drops one you do not need. Press Merge and the finished file is ready to download a second later. Nothing to install, no account required.
What order will the pages end up in?
Exactly the order the documents sit in the list, top to bottom. The first file supplies the first pages, the second picks up where the first ended, and so on. We never sort the list ourselves — not by name, not by date, not by size — because the right order cannot be guessed: alphabetically, “Exhibit A” lands before “Agreement”, which is rarely what anyone wants.
Will the quality of the pages change?
No, and that is not a hedge meaning “barely noticeable”. Merging never touches the image of a page: nothing is redrawn into pixels and nothing is compressed again. The page moves into the new document as it is, with its text, fonts and images intact. A page in the finished file cannot be told apart from the original because it is literally the same data.
How many files can I merge at once?
Up to twenty. The limit is about sensible use rather than computing power: a bigger pile usually means the documents are better assembled in parts. If you have more, merge them in rounds — the finished document can be uploaded straight back and combined with the rest, and nothing degrades along the way.
What is the size limit?
64 MB for the whole batch, not per file. For documents that is generous: a contract with exhibits rarely runs past a couple of megabytes, and the limit is usually only reached by high-resolution scans. If a batch will not fit, split it into two rounds or compress the heavy scans before uploading.
Are bookmarks and the table of contents kept?
No — an honest limitation rather than an oversight. What carries over is pages with everything on them, and an outline lives apart from the pages: it is a tree of links describing a whole document. When there are several documents, each brings its own tree with its own numbering, and combining them into one that still makes sense cannot be automated — somebody has to decide what became a section, what a subsection, and what to call it. Text, images, fonts and page layout are all unaffected.
Can I merge a password-protected document?
No. We do not open those: whoever set the password did not want the file read by outsiders, and working around that is wrong even where it is technically possible. If the password is yours and you know it, remove the protection in whatever app you normally read the document with, then upload it again.
What if a PDF is damaged and will not open elsewhere?
There is a fair chance it still works. The engine behind this tool repairs a document's internal structure as it opens it — the object table, the links between objects — so files that trip up ordinary viewers often open here. It is not magic, though: if the page data simply stops partway, there is nothing to take, and we will refuse plainly rather than hand you half a document.
What happens to a digital signature?
It stops being valid, and that is true of every tool, not just this one. A signature certifies one specific file in full: it attests that not a single byte has changed since signing. Merging produces a new document — precisely the kind of change a signature exists to catch. If the document needs to be signed, sign the finished file after merging rather than the parts before it.
Can I merge Word files, images, or pages of different sizes?
Word files and images, not yet — this page takes PDF only. Convert them first (in Word that is Save as → PDF) and merging works from there. Different page sizes, on the other hand, are no problem at all: A4 and letter, portrait scans and landscape slides all sit happily in one document, each page keeping its own dimensions and orientation.
What happens to my files afterwards?
The documents you upload are never stored: they live in memory only for as long as the merge takes. The finished file has to go to disk — it is the thing we hand back to you — and it is swept by age after about half an hour, whether or not you collected it. The link to it is signed, cannot be guessed, and stops working once it expires.
Is this free? Will there be a watermark?
Free in full: there are no paid tiers, no subscription and no limits that lift if you pay. There are no watermarks either — nothing stamped across the pages and no site address in the corner of the result. We ask for no sign-up; the site has no accounts at all.
Does merging work on a phone?
Yes — the page behaves the same in a mobile browser as on a desktop: documents are picked through the usual file dialog and reordered with the same buttons. No app to install, which matters most on a phone, where installing something for a one-off task is the real cost.