Question 1

Are my PDFs uploaded to your server?

Accepted Answer

No. Every PDF is read, parsed and merged entirely inside your browser using pdf-lib and pdf.js. Your files never leave your device — no uploads, no logs, no storage.

Question 2

Can I merge multiple PDFs at once?

Accepted Answer

Yes. Add as many PDF files as you like. Drag to reorder them, then click Merge PDF to combine everything into a single downloadable document.

Question 3

Can I reorder the PDFs before merging?

Accepted Answer

Yes. Drag any file up or down in the list, or use the move-up / move-down / move-to-top / move-to-bottom buttons. Preview position numbers update instantly.

Question 4

Can I merge only selected pages from each PDF?

Accepted Answer

Yes. Each file has a Pages field where you can type ranges like 1-3, 5, 7-9. Leave it blank to include the whole document.

Question 5

Will my original PDF files change?

Accepted Answer

Never. We read a copy of each file into memory and generate a brand-new merged PDF. Your source files stay untouched on disk.

Question 6

Does it work on my phone?

Accepted Answer

Yes. The tool is fully responsive and works on modern browsers on Android, iPhone and iPad. Touch-based reordering is supported where the browser exposes drag events.

Question 7

What if a PDF is password-protected?

Accepted Answer

Encrypted PDFs cannot be merged directly. Unlock the file first (for example with our upcoming Unlock PDF tool) and then add it to the merge list.