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Drop in two or more PDFs, drag them into the order you want, and download a single combined document. Unlike most online PDF mergers, the merging happens entirely on your device using WebAssembly — your files never leave your computer, which matters when you're combining contracts, medical records or anything else you'd rather not hand to a stranger's server.
There are no file limits, watermarks or sign-ups. Large documents work fine; the practical limit is your device's memory.
Frequently asked questions
Are my PDF files uploaded to a server?
No. The merge runs locally in your browser using the pdf-lib library compiled to WebAssembly. You can disconnect from the internet after the page loads and merging still works.
Will merging change the quality of my PDFs?
No. Pages are copied losslessly into the new document — text stays selectable, images keep their original resolution, and internal formatting is preserved.
Can I control the page order?
Yes. Each file can be moved up or down in the list before merging, and you can remove files you've added by mistake. Pages within each file keep their original order.