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Merge PDF files — without uploading them

Combine multiple PDFs into a single file, right in your browser. Drag to set the order, merge, download. No server ever sees your documents.

100% private — files never leave your device

How it works

  1. 1

    Drop two or more PDF files, or pick them with the file chooser.

  2. 2

    Drag the list into the order you want — top file comes first.

  3. 3

    Click Merge and download the combined PDF. Everything happens on your device.

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Frequently asked questions

Is merging really done without uploading my PDFs?

Yes. The merge runs entirely in your browser using the open-source pdf-lib library inside a Web Worker. There is no server — this site is static files only, and its security policy blocks requests to third parties.

Is there a file size or page limit?

There is no fixed limit. Because everything runs on your device, very large files are only bounded by your browser's memory — we show a heads-up above roughly 300 MB combined.

Can I merge password-protected PDFs?

Not yet. Encrypted files are detected and flagged in the list; remove the password first, then merge. Other files in your list are unaffected.

Does the page order in the merged PDF match my list?

Yes — files are combined top to bottom exactly as ordered in the list. Drag entries or use the arrow buttons to reorder before merging.