Yes — Merge PDF is completely free on DukPdf. No signup, no email, no watermark.

Are my files uploaded?

No. All processing happens directly in your browser. Your files never leave your device, so nothing is uploaded to any server.

Do I need an account?

No account or email is required. Every tool works for anonymous visitors.

Yes — once the page has loaded, the tool runs entirely in your browser and continues to work without an internet connection.