Question 1

What order will the merged PDF be in?

Accepted Answer

Pages are combined in the order you add the files, with all pages of the first file first, then all pages of the second, and so on. You can reorder the file list before merging.

Question 2

Is there a limit on how many PDFs I can merge?

Accepted Answer

There's no hard limit on file count, but the combined document is capped at 500 pages to keep processing fast and reliable in your browser.

Question 3

Does merging work with password-protected PDFs?

Accepted Answer

No — encrypted or password-protected PDFs can't be read client-side without the password. Remove the password first (in a PDF reader) before merging.

Question 4

Does merging reduce PDF quality?

Accepted Answer

No. Merging copies each page exactly as-is — no re-encoding or rasterizing happens, so there's no quality loss.

Question 5

Is my file uploaded to a server?

Accepted Answer

No. Merging happens entirely in your browser using the pdf-lib library — your files never leave your device.

PDF Merge

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Frequently Asked Questions

What order will the merged PDF be in?

Is there a limit on how many PDFs I can merge?

Does merging work with password-protected PDFs?

Does merging reduce PDF quality?

Is my file uploaded to a server?

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