Merge PDF

Combine several PDFs into one document — in your browser, with nothing uploaded.

Runs on your devicePDFWorkingNo account needed

What this tool does

Merging rebuilds a single PDF containing every page from the files you add, in the order you set. Pages are copied structurally rather than re-rendered, so text stays selectable and image quality is untouched — the output is the same pages in a new container.

This runs entirely in your browser using pdf-lib. That is unusual for a PDF merger and it matters: the documents people merge are contracts, medical letters, bank statements and applications. Every online merger that uploads your files is a copy of those documents on someone else's disk, however briefly.

Because it is local, there is no file-size ceiling imposed by an upload limit and no queue. The practical limit is your device's memory, which comfortably handles the hundred-page documents most people are merging.

How to use it

  1. Add your PDFs. Drop them in or choose them. At least two PDFs are required — anything that is not a PDF is ignored.
  2. Choose the order. File order can be left as added, or sorted by file name A → Z or Z → A. A page box lets you take only part of each file, and you can rename the output.
  3. Merge and download. One PDF comes back containing every selected page. Nothing is stored once you leave.

Processing & privacy

Runs on your device. Your file is processed directly in this browser.

Common use cases

Submitting an application

Portals often want one file: CV, cover letter, certificates and references combined.

Assembling a report

Bring a cover page, the body and appendices from different sources into one document.

Filing paperwork

Combine scanned pages that arrived as separate files into a single record.

Sending an invoice batch

One attachment instead of twelve is easier for the recipient and less likely to be blocked.

Questions

Are my files uploaded?
No. Merging happens in this browser tab. The files never leave your device, which is the point — merged documents are usually the sensitive ones.
Does merging reduce quality?
No. Pages are copied as-is, not re-encoded. Text stays selectable, images keep their original resolution, and the merged file is roughly the sum of the originals.
What does the merge not carry over?
Page content survives, but document-level structure does not: bookmarks and outlines are dropped, interactive form fields and signatures may stop working, and links that pointed to a place inside their original file can land on the wrong page once numbering shifts. Flatten or fill forms before merging if they matter.
Can I merge password-protected PDFs?
Not directly. Remove the password first with Unlock PDF — a document you can open, using a password you have. Encrypted content cannot be copied into a new file while it is still encrypted.
How many files can I merge?
Two at minimum, with no upper limit imposed. Memory is the constraint, and a normal laptop handles dozens of documents totalling hundreds of pages without difficulty.
Can I pick which pages to take?
Yes, but only one range for the whole queue: entering 1-3 takes the first three pages of every file, not of one. Per-file selection and page-by-page rearranging belong to Organize PDF.

Related tools

  • Split PDF — Split one PDF into separate documents by page range.
  • Compress PDF — Reduce PDF file size while preserving the quality that matters.
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  • JPG to PDF — Turn one or many JPG photos into a single PDF.
  • Protect PDF — Add a password and set permissions on a PDF.
  • Sign PDF — Draw, type or upload a signature and place it on the page.