Are my files uploaded to a server?

No. Merging happens entirely in your browser. You can verify it: open your browser's network tab — no file data leaves the page.

Is there a file size limit?

Processing runs on your device, so the limit is your device's memory. Desktops handle hundreds of megabytes; phones are more constrained.

Drag the files into the order you want, or use the up/down arrows on each file card.

Once the page is loaded, merging works without a connection — nothing is sent anywhere.

Yes. Merging PDF files is free with no sign-up.

Combine PDFs into one document, right in your browser. Fast, free, private.

Are my files uploaded to a server?: No. Merging happens entirely in your browser. You can verify it: open your browser's network tab — no file data leaves the page.
Is there a file size limit?: Processing runs on your device, so the limit is your device's memory. Desktops handle hundreds of megabytes; phones are more constrained.
How do I change the page order?: Drag the files into the order you want, or use the up/down arrows on each file card.
Does it work offline?: Once the page is loaded, merging works without a connection — nothing is sent anywhere.
Is it free?: Yes. Merging PDF files is free with no sign-up.