Merge PDF
Combine two or more PDFs into a single document, in the order you choose. Merging happens in your browser — your files are never uploaded.
Choose PDF files
or drop files here
▚ files open locally — nothing is uploaded
- 01Choose or drop two or more PDF files. They open locally in your browser tab.
- 02Reorder the files with the arrow buttons — the merged document follows this order.
- 03Click Merge. Your browser combines the pages on your device and downloads merged.pdf.
Merging PDFs is the most common PDF task there is: assembling a contract with its annexes, combining scanned pages into one document, or packaging reports for a client. It's also the task people most often hand to a random website — along with the document itself.
ZorPDF's merger works differently. The PDF engine runs entirely in your browser, so the file that contains your signature, your client's terms, or your patient's records is processed by your own computer. You can watch the Network tab in your browser's developer tools while merging: no request carries your document anywhere.
How is this different from other PDF mergers?+
Most online mergers upload your PDFs to their servers, process them there, and send the result back. ZorPDF does the merging inside your browser with WebAssembly — the files never leave your device. That matters for contracts, financial records, or anything else you wouldn't email to a stranger.
Is there a limit on files or pages?+
No. Merge as many PDFs as you like, as often as you like. The only practical limit is your device's memory, and typical documents don't come close to it.
Will the merged PDF be watermarked?+
No. The output is a clean PDF containing your pages in the order you set — nothing added, nothing branded.
Can I change the order of the files?+
Yes. After adding files, use the arrows next to each file to reorder them. Pages appear in the merged PDF in exactly that order.
Does it work with password-protected PDFs?+
Not yet. If a file is encrypted, you'll see a clear message asking you to remove the password first. A local password-removal tool is on our roadmap.