Is the PDF merger really free?

Yes — 100% free with no sign-up, no watermarks, and no paid tier. It runs entirely in your browser using the open-source pdf-lib library.

How many PDF files can I merge at once?

You can merge up to 10 PDF files in a single operation. If you need to merge more, download the result and add it as the first file in a new batch.

Is there a file size limit?

The combined total of all selected files must be under 200MB. Individual files can be any size as long as the total stays within this limit.

Are my files uploaded to a server?

No. Everything runs inside your browser using pdf-lib. Your PDFs are never sent to any server and are cleared from memory when you close the tab.

PDF Merger

Merge PDF Files Free — Combine PDFs Online

Free online PDF merger — combine multiple PDF files into one document. Upload up to 10 files, arrange the order, and merge in seconds. No sign-up required. Your files never leave your browser.

Last updated: April 2026 · Powered by pdf-lib

Drop PDF files here or click to browse

Select multiple PDF files at once

Up to 10 files · Max 200MB total

Merging... 0%

Merged PDF Ready!

Your PDFs have been combined. Click to download.

Privacy guaranteed: PDF merging runs entirely in your browser using pdf-lib. Your files are never uploaded to any server and are cleared from memory when you close the tab.

Merge PDF Files Free — Combine PDFs Online

Drop PDF files here or click to browse

Merged PDF Ready!

How It Works

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