Merge PDF guides

Merging PDFs is the single most common thing people ask a file tool to do, and it is also where most free tools quietly punish you: a watermark across page one, a two-file limit, or an account wall that appears after the upload finishes. These guides cover the job properly. Start with the main guide if you just want it done, and use the specific ones when your situation is specific: merging on an iPhone works differently from merging on a Mac, and merging twenty scanned pages has different pitfalls from merging two contracts. Every guide here was written against our own merge tool and re-checked when the tool changed, so the steps match what you will actually see on screen. Where an online tool is the wrong answer, the guides say so plainly: files over the size cap, documents you are not allowed to upload anywhere, and anything you need to do repeatedly on a schedule are all better handled another way, and each guide tells you which.