Merging PDFs — combining a few separate files into one — comes up more often than it should be this annoying: a scanned signature page that needs to join a contract, several chapters of a report, or three receipts that need to become one attachment. Here's the quick way to do it.
Steps
- Open Merge PDF.
- Drop in your PDF files, or click to browse and select them — you can add more than two at once.
- Drag the files into the order you want them to appear in the final document.
- Click Run. The combined file downloads straight to your device.
What actually happens
Nothing is uploaded anywhere. The merge tool loads pdf-lib directly in the page, reads each file into your browser's memory, copies every page into one new document in the order you set, and hands the result back as a download. Your files never leave your device — which also means there's no server-side file size limit; the practical ceiling is just how much memory your browser has available.
A couple of things worth knowing
- Order matters — the files merge top to bottom exactly as arranged in the file list.
- Password-protected PDFs need the password removed first; the merge tool can't read an encrypted file's pages.
- There's no cap on how many files you can merge, though very large batches (dozens of large scanned PDFs) will naturally take longer since everything is processed on your own device.