Combining PDFs is one of those small tasks that comes up constantly: stitching a signed page back into a contract, assembling scanned receipts into one expense report, or packaging several chapters into a single document to send. This tool merges any number of PDF files into one, in the order you choose, without your documents ever leaving the browser.
Unlike most online mergers, nothing here is uploaded. The files are read and combined by the pdf-lib engine running as JavaScript inside your own tab, which makes it safe to merge contracts, medical records, and other documents you would never hand to an unknown server.
Your documents are never transmitted anywhere. Reading, merging, and saving all happen inside your browser tab, so confidential files stay entirely on your machine.
There is no fixed limit. Because everything runs in your browser's memory, very large collections are bounded by your device rather than by any server quota; merging dozens of ordinary documents works fine.
Yes. Pages are copied into the new document as-is, without re-rendering or recompression, so text stays sharp and selectable and images keep their original resolution.
Encrypted files that require a password to open cannot be merged. Remove the password first using the software that created the file, then merge the unlocked copies.