Merge PDF

Combine two or more PDF files into a single document, in your browser with pdf-lib — no uploads, no limits, no signup.

Choose PDF files

Files to merge (in order)

What is a PDF merger?

A PDF merger takes two or more separate PDF documents and combines them into one file, page by page, in the order you choose. This is useful for consolidating scanned documents, combining several invoices, building a single report from multiple chapters, or attaching related files together before sharing.

This tool does the whole job in your browser using the open-source pdf-lib library. Your PDFs are read locally, the pages are copied as they are, and the combined file is produced and downloaded — nothing is ever sent to a server. That makes it safe for private or confidential documents.

How to use

Click the file input and choose two or more PDF files.
Use the up and down arrows to put them in the order you want.
Click Merge PDFs, then download the combined file.

Example

You have three chapters of a report saved as separate PDFs. Select all three, arrange them from Chapter 1 to Chapter 3, and click Merge. The tool produces a single PDF with every page in order, ready to share or print.

Who is this PDF merger for?

Professionals and students: They merge multiple scans, receipts or report chapters into one document to send in a single attachment.
Marketers: They combine several campaign PDFs into a deck or one shareable asset for clients.
Developers: They join PDFs locally, so files stay on-device and no document is uploaded to a server.
Content creators: They bundle article or template pages into a single PDF for a clean download.

PDF page sizes when merging

Page	Paper size	Dimensions (px × 96 DPI)	Dimensions (pt)
A4	210 × 297 mm	794 × 1123	595 × 842 pt
A5	148 × 210 mm	559 × 794	420 × 595 pt
Letter	8.5 × 11 in	816 × 1056	612 × 792 pt
Legal	8.5 × 14 in	816 × 1344	612 × 1008 pt

Common use cases

Combining invoices or receipts into one document.
Merging scanned pages and forms.
Building a single report from multiple chapters.
Attaching several documents before sending.

Pro tips

Arrange files in the exact order you want before merging.
Remove any file you do not need to keep the result clean.
Only PDF files can be merged — convert images or other formats first.
The merge preserves each page's original content and layout.

FAQ

How do I merge PDF files for free?

Select two or more PDF files and click Merge. The files are combined in the order they are listed and the result is downloaded instantly.

Is it really free?

Yes — you can merge unlimited PDFs for free, with no sign-up, no watermark and no limits.

Are my PDFs uploaded to a server?

No. The merge runs entirely in your browser using the pdf-lib library, so your files never leave your device.

Can I reorder the PDFs before merging?

Yes — use the up and down arrows to change the order of the files, and remove any you do not want before merging.

What is the best order for merging?

The pages are combined in the order the files appear in the list. Arrange them from first to last before you click Merge.

Does the merge preserve quality and layout?

Yes. pdf-lib copies the original pages as-is, so the text, formatting and images in each file are unchanged.

What file types can I merge?

Only PDF files. For other file types like images, convert them to PDF first using the Image to PDF converter.

Can I merge PDFs on mobile?

Yes — the tool runs in any modern browser, so it works on phones and tablets too.