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Add the files, move them into the order you want, and get one document back. Page size and orientation are kept per page, so an A4 report and a scanned landscape sheet both survive the merge as they were.
This runs in your browser. The file is not uploaded, there is no account to create, and nothing is added to the document you download.
Also searched for: combine pdf, join pdf, pdf merger. It is the same tool whichever way you found it.
There is no file-count limit. Add as many as you need, drag them into the order you want, and they come back as one document.
No. Page size and orientation are kept per page, so an A4 report and a scanned landscape sheet both survive the merge exactly as they were rather than being stretched to a common size.
No. The file is opened, changed and written by this browser tab — it is never sent to a server, so there is no queue to wait in and nothing to delete afterwards. Once the page has loaded you can turn the network off and the tool still works.
There is no account, no daily cap and no watermark. The practical ceiling is your own device: everything happens in the tab, so a very large file is limited by memory rather than by a plan.