PDFLosslessRuns in your browser

Merge PDF

Combine several PDFs into one, in the order you arrange them. The conversion is lossless — every pixel, sample or byte in the source is preserved.

Not uploaded to any serverConverted on this deviceGone when you close the tabHow this works

Drop your files here

PDF · up to 200 MB each

or paste files from your clipboard

Ready when you are

Combine several PDFs into one, in the order you arrange them. Everything happens in this tab; nothing is sent anywhere.

⌘K to search converters

How to use it

1
Add your files
Merge PDF works with PDF. Drop them in, browse for them, or paste from your clipboard.
2
Put them in the right order
The files are processed top to bottom. Drag them to rearrange before you start.
3
Run it and download
Press the button and save the result. Everything happens on your device, and nothing is uploaded.

Privacy, in plain words

Is it safe? Your PDF is not uploaded anywhere

What “uploaded” normally means. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website. That copy is what the word “upload” means, and it is the part nobody explains.

What happens instead. This site does not do it. There is no server here that receives files, so your PDF is read, converted and handed back by the browser you are using right now. It never travels — so there is no copy to store, read, leak or hand over.

Check it yourself in ten seconds

Turn off your Wi-Fi after this page has loaded, then convert a file anyway. It still works, because everything needed is already on your device.

The longer explanation of how this works, and the full detail of what is and is not stored on the privacy page.

Why this matters more than it sounds

PDF is the format people use for exactly the documents they would not hand to a stranger. It matters more than it sounds, because of what PDFs usually are:

Medical letters and results

a diagnosis is not something to leave on a server

Payslips

salary, employer, and usually your home address

Bank statements

account numbers, balances, every payee you have

Signed contracts

your signature, and terms you may be under NDA about

A file that is never sent cannot be kept, leaked, subpoenaed or used to train anything. That is a property of how this works, not a promise about how carefully it is run.

What merging does to your files

Merging copies the pages of each document into a new one, in the order you set. Nothing is re-encoded: the text stays text, images keep the exact quality they had, and the result is byte-for-byte the same content in a new container. A merged file is normally about the sum of its parts.

The order is the whole interface, and it is worth getting right before you start rather than after. Files are combined top to bottom as listed, and rearranging afterwards means merging again.

Bookmarks and links: Internal links that pointed within one document continue to work, because its pages stay together and in order.
Form fields: Two documents with a field of the same name can collide, since a PDF form expects one field per name. Check any merged form before sending it.
Page size can vary: Merging A4 and Letter pages produces a document with both. That is correct rather than broken, but it prints inconsistently.

Related jobs people reach for this with

Merging is often one step of two, and the other step is usually where the size or the order problem actually is.

The result is too large to email: Merge first, then compress once. Compressing each file separately and then merging gives a worse result for the same effort.
You have photos rather than PDFs: Images convert to PDF first; a set of JPGs can become a single document in one step.
You wanted only part of each file: Split out the pages you need before merging, rather than merging everything and deleting afterwards.

Measured, not estimated

What this tool actually does to a file

Merging two copies of the same document into one twelve-page file.

It depends entirely on the content: across the samples the result ranged from 9% smaller to about the same size, with a middle case 2% smaller.

Each row is one document, chosen because this tool behaves differently depending on what is inside the file.
Sample	In	Out	Change
A text reportSix pages of text and nothing else — the case where there is very little for a compressor to find.	13.4 KB	12.2 KB	−9%
A scanned documentSix pages that are each one photograph of a page. Almost all the bytes are image, which is where PDF compression actually earns its keep.	846 KB	845 KB	−0%
Text with figuresText pages carrying two embedded images — the ordinary shape of a report, and the one most PDFs in the world actually have.	49.1 KB	47.9 KB	−2%

Produced by this site's own converter. The same code that runs in your browser, at the same default settings, so these are the bytes you would download.

Samples are generated from a fixed seed rather than taken from real photographs or documents, so the corpus is reproducible and carries no licensing question — and so the numbers predict the shape of your result rather than its exact size. Measured 2026-10-01. The method, and the command that regenerates every figure on this page, are on the how it works page.

About these formats

Accepts

Portable Document Format

Fixed-layout documents that look identical everywhere.

Extensions: .pdf
MIME type: application/pdf
Best for: Sharing documents · Printing · Contracts and forms
Compatibility: Universal.

Pages are copied without re-encoding, so quality, text selection and links are untouched.

Good to know

Merge PDF — questions

How does Merge PDF work?

Combine several PDFs into one, in the order you arrange them. Add your files above, adjust anything you want to change, and press the button. The result downloads straight to your device.

Is there anything I should watch out for?

Pages are copied without re-encoding, so quality, text selection and links are untouched.

Is Merge PDF safe — are my files uploaded to a server?

No, nothing is uploaded. On most online tools, pressing the button copies your file across the internet onto a computer owned by that website, where it is processed and then sent back. That copy is what "upload" means. This tool does not do it: your file is read and processed by the browser you are using right now, stays on this device the whole time, and is discarded when you close the tab. Turn off your Wi-Fi after the page loads and it still works, which is the quickest way to confirm it.

Can I use this on confidential or personal documents?

Yes — that is the case it was built for. Because the file never leaves your device, a confidential document is no more exposed than it is sitting in your own folder: there is no transfer, no copy on anybody else's hardware, no retention period and no staff with access. Nothing about the file is logged either — not its name, not its size, not its contents.