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FreeConvertter

Merge PDF

Combine several PDFs into a single document, in exactly the order you want.

or drag and drop them here · up to 200 MB per file

Your files are processed on this device and never uploaded.

Instant conversion

There is no upload or server queue, so conversion starts the moment you drop a file and finishes as fast as your device can process it.

Your files stay private

Files are processed entirely inside your browser. They are never sent to, stored on, or seen by any server.

Nothing to install

Works on Windows, macOS, Linux, Android and iOS in any modern browser. No software, no extensions, no account.

How to use Merge PDF

  1. 1

    Click "Choose PDF files" or drop all the PDFs you want to combine.

  2. 2

    Use the arrow buttons to put the files in order.

  3. 3

    Click "Convert" to merge them on your device.

  4. 4

    Click "Download" to save the merged PDF.

When to merge PDFs

  • Applications and submissions — combine a CV, cover letter and certificates into one file.
  • Accounting — gather a month of invoices or receipts into a single PDF.
  • Reports — join chapters or appendices produced by different people or programs.

How merging works

The pages of each file are copied, in the order shown, into a new PDF document using the open-source pdf-lib library. Nothing is re-rendered, so the merged file looks exactly like the originals.

What is a PDF file?

PDF (Portable Document Format) was created by Adobe and is now an open ISO standard (ISO 32000). A PDF fixes the exact layout of every page — fonts, images and positions — so a document looks the same on every screen and printer. That makes it the standard for contracts, invoices, manuals, papers and forms.

Inside, a PDF stores each page as drawing instructions. Text written by a program is stored as real characters (a “text layer”) and can be selected and extracted. Scanned documents usually store only a picture of each page, so their text cannot be extracted without OCR.

Frequently asked questions

Is the quality of my PDFs affected?

No. Pages are copied as they are — text stays selectable and images keep their original quality.

Are bookmarks, links and form fields kept?

Page content, including text, images and annotations on the page, is kept. Document-level features such as the bookmark outline and interactive form logic may not carry over to the merged file.

Can I merge password-protected PDFs?

No. Encrypted PDFs are detected and refused. Remove the protection with the software that created it first.

How many files can I merge?

As many as your device's memory allows. Each file can be up to 200 MB.

Are my files uploaded?

No. Merging happens entirely in your browser.

Related guides

Are online file converters safe?Is it okay to upload a contract or an ID card to an online converter? The difference between server-based and in-browser conversion — and how to verify it yourself.Read guide →How to combine phone photos and receipts into one PDFExpense reports and applications often need several photos as one PDF. Here's how to get the order, orientation and page size right.Read guide →How to split, extract, delete and rotate PDF pagesNeed to send only part of a PDF, get under an upload limit or fix a sideways scan? Four PDF page tools and the page-range syntax, explained with examples.Read guide →

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