Combine multiple PDF files into one document. Everything runs locally in your browser.
The merger uses pdf-lib inside your browser. It opens each file you drop in, copies the pages into a new document in the order you've arranged them, and re-serializes the result — bookmarks and hyperlinks inside each source PDF are preserved page-by-page. Because it's all client-side, a 100-page contract set never leaves your laptop, which matters for NDAs, medical records, and legal filings.
Practical uses: stitching signed signature pages onto a base contract, combining month-end invoices into one archive, assembling a portfolio from separate design PDFs, or merging scanned pages that arrived in the wrong order. Files are processed sequentially, so a 20 MB + 30 MB merge peaks around 60 MB of browser memory — comfortable on any modern phone or laptop.
If your original PDFs are password-protected, unlock them first — pdf-lib can't merge encrypted files, and this keeps every operation transparent about what it can and can't do.
