How to Merge PDFs on Linux (Free, No Install)

Updated for 2026

For a quick GUI merge, open PDFzen in your browser; for scripting, use qpdf or pdftk.

Bottom line: For a quick GUI merge, open PDFzen in your browser; for scripting, use qpdf or pdftk.

Try it free — your files never leave your browser

GUI — browser tool

PDFzen runs in any Linux browser; merge, reorder, compress, all local.

CLI — qpdf

qpdf --empty --pages a.pdf b.pdf -- merged.pdf

CLI — pdftk

pdftk a.pdf b.pdf cat output merged.pdf

What we verified

We confirmed PDFzen's merge runs in Firefox on Linux (same pdf-lib engine); the qpdf/pdftk commands above are the standard, tested CLI approach.

FAQ

Can I merge PDFs on Linux for free?

Yes — browser tool or qpdf/pdftk.

Is there a GUI?

PDFzen in the browser; or PDFsam (desktop).

Command line?

qpdf --empty --pages a.pdf b.pdf -- out.pdf.

About PDFzen

PDFzen is a small, independent set of free, in-browser PDF tools. Files are processed locally in your browser and are never uploaded to a server — no accounts, no watermarks, no upsells. Every guide is written from running the tools on real files.

Read how we test & write our guides →