Yes. Merging runs entirely in your browser with pdf-lib, an open-source JavaScript library, so your PDFs are never uploaded or stored on a server. It suits confidential documents.
Yes. Merging is free, needs no account, and adds no watermark or branding to your file.
There is no set limit on the number of files or their size. The practical limit is your device’s memory, because everything happens on your device.
Yes. Drag the files into any order and remove any you don’t need. The preview shows the final document.
You don’t need Acrobat: this page does it free in any browser. See the merge PDFs without Adobe guide for a step-by-step walkthrough.