Merge PDF
Combine PDFs into a single file. Put them in the order you want, check the page count, and download — with no watermark and no account.
Runs on your device — documents are never uploadedDrop your PDFs here
or click to browse — all at once, or a few at a time
PDF · as many as you like
Each file is held in memory while it is copied, so a few hundred pages is comfortable and a few thousand will strain a phone. Merge in stages if it slows.
How it works
Three steps, no account, and the documents never leave your computer.
Add your PDFs
Drop them in together or a few at a time. Each one shows its cover and page count as soon as it is read, so you can tell them apart without opening them.
Put them in order
Use the arrows to move a file up or down. The order in the list is the order in the finished document.
Merge and download
One file comes out, with every page from every input, in order.
When you need one file instead of five
An application that accepts a single attachment
Visa forms, job applications, grant submissions and school enrolments routinely allow one upload. Merging the passport scan, the certificate and the letter solves it.
Scans that came out as separate pages
Many scanners and phone scanning apps save one file per page. Ten pages, ten files, and nobody wants to open ten attachments.
Assembling a report or a portfolio
A cover page, the body, and appendices produced in different programs, joined into the single document you actually send.
Invoices and receipts for an expense claim
A month of receipts in one file is far easier to submit — and to keep — than a folder of individual PDFs.
Merging PDFs without wrecking them
Combining PDFs is one of the most common document tasks there is, and also one of the easiest to do badly. The difference between a good merge and a bad one is whether anything was re-rendered along the way.
Copying pages versus re-printing them
There are two ways to put two PDFs together. The right way copies each page's existing content streams, fonts and images into a new document — the page arrives intact, exactly as it was. The wrong way renders each page to an image and builds a new PDF out of pictures.
The second approach is easier to implement and produces a file that looks fine at a glance. What it destroys is everything underneath: selectable text, searchability, links, bookmarks and accessibility. A merged document made of images cannot be searched, cannot be read aloud by a screen reader, and balloons in size.
This tool copies pages. The text in your merged file is still text, the file size is roughly the sum of the inputs rather than a multiple of it, and nothing is re-compressed.
Order is the part people get wrong
The most common merge complaint is not corruption — it is pages in the wrong sequence. This happens because files rarely arrive named in the order you want them. Alphabetical sorting puts page10 before page2, and scanner output like scan_0001 is only correct if nothing was ever rescanned.
That is why the list here shows a thumbnail of each file's first page alongside its page count, and why order is something you set rather than something that is guessed for you. Looking at four covers is a faster way to catch a mistake than reading four filenames.
Files that will not merge
Two situations account for nearly every failure.
Password-protected files. A PDF encrypted with an open password cannot be read at all until it is unlocked — by design, and no tool can honestly get around that. Open it in any PDF reader with the password, save a copy without protection, and merge that. PDFs with only permission restrictions, which are far more common, merge without complaint.
Damaged files. A PDF truncated by an interrupted download or a failing drive may open in a forgiving reader and still fail a strict parse. If one file in a set refuses, try opening it and re-saving it from your reader first.
What happens to the extras
A PDF carries more than pages. Merging keeps each page's own content faithfully, and a few document-level features do not survive the join cleanly:
- Bookmarks and the outline belong to the document, not the page, so the merged file starts without them.
- Form fields can collide when two documents use the same field names.
- Internal links pointing at page numbers may aim at the wrong place once pages move.
For the overwhelming majority of merges — scans, reports, applications, receipts — none of this matters. If you are merging interactive forms, check the fields in the result before sending it.
Why nothing is uploaded
Most PDF sites work by uploading your document, processing it on a server and offering the result back. It works, and it means your document sits on somebody else's machine for a period you do not control.
The documents people merge are rarely trivial: passports, contracts, medical records, bank statements, applications with an address and a date of birth on them. That is precisely the material worth keeping off other people's servers.
Here the PDF engine runs in your browser. Your files are read from disk, combined in memory, and written back to your downloads folder — which is also why there is no account, no daily limit and no watermark on the result.
Common questions
Are my documents uploaded anywhere?
No. The PDF engine runs inside your browser using your own processor. Your files are read from disk, merged in memory, and saved back to your downloads folder. Nothing is transmitted at any point.
Is there a watermark or a page limit?
Neither. There is no server cost per file here, so there is nothing to recover with a watermark or a daily cap. The result is a clean PDF.
Will the text stay selectable?
Yes. Pages are copied with their content intact rather than re-rendered as images, so text stays text and the file stays searchable. Tools that flatten pages to pictures are the reason merged PDFs sometimes become unsearchable.
How do I change the order?
Use the up and down arrows beside each file. The list order is the order in the finished document. Each file shows its first page as a thumbnail, which is the quickest way to confirm you have them the right way round.
One of my files will not load. Why?
Usually because it is password protected — an encrypted PDF cannot be read until it is unlocked. Open it in a PDF reader with the password, save an unprotected copy, and merge that instead. A damaged or partially downloaded file will also refuse.
Do bookmarks and form fields survive?
Page content does, faithfully. Bookmarks belong to the document rather than to any page, so the merged file starts without them, and form fields with matching names in two documents can collide. Check the result if you are merging interactive forms.
How many files can I merge at once?
No limit is imposed. Everything is held in memory while it is copied, so a few hundred pages is comfortable on any device and a few thousand may strain a phone. If it slows down, merge in stages.
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Every one of them runs on your device. No uploads, no accounts.