Toolix

PDF Tool

Merge PDF Files Into One

Combine scanned pages, certificates, invoices, or reports into a single document in exactly the order you choose. Your files are read and merged on this device, so confidential documents never reach a server.

Up to 20 filesReorder before mergingNo upload, no watermark

Merge PDF Files

Combine several PDFs into one document, in the order you choose, without uploading anything.

Add two or more PDF files to merge them in order.
Runs privately in your browser

Guide

How to merge PDF files

Use this PDF merger to combine separate documents, scanned pages, certificates, or invoices into one file before sending or printing. You control the exact order of the files, and the merge is performed locally with pdf-lib, so contracts and personal records are never uploaded to anyone's server.

  1. 1

    Add your PDF files

    Drop two or more PDFs onto the tool, or choose them from your device. Up to 20 documents can be combined at once.

  2. 2

    Set the order

    Use the up and down arrows to arrange the documents. Pages are combined from top to bottom exactly as the list shows.

  3. 3

    Merge the documents

    Press merge. Each file is read and its pages are copied into a single new document, with progress shown as it works.

  4. 4

    Download the result

    Download the merged PDF. The original files on your device are left completely unchanged.

Merge problems this tool solves

  • A scanner produced one PDF per page and you need a single document to submit.
  • An application asks for one combined file but your certificates are all separate PDFs.
  • Online merge tools require an account, add watermarks, or limit how many files you can use per hour.
  • You do not want confidential contracts or financial statements uploaded to a third-party server.
  • Pages end up in the wrong order because the tool sorted files alphabetically instead of asking you.

Frequently asked questions

How many PDFs can I merge at once?

Up to 20 documents in a single merge. The limit keeps memory use reasonable so the browser stays responsive, even on a modest phone or laptop.

Are my PDFs uploaded to a server?

No. The merge runs entirely in your browser using pdf-lib. Nothing is transmitted, which makes this safe for contracts, medical records, and financial documents.

Can I change the order of the files?

Yes. Each file in the queue has up and down arrows. The merged document follows the order shown in the list, top to bottom.

Will merging reduce the quality of my PDFs?

No. Pages are copied across without being re-encoded, so text stays selectable and images keep their original resolution.

Can I merge a password-protected PDF?

Not directly. Encrypted documents must have their password removed first. The tool detects protected files and tells you rather than failing silently.