In short
This tool combines several PDFs into a single document: the documents for an application, the month's invoices, the chapters of a report. Drop at least two files, put them in order by dragging and dropping or sort them by name, and get a single PDF. The pages are copied as they are, without recompression: the text stays selectable and the quality does not change. Bookmarks from the original files are not carried over. The number of files is limited only by your device's memory. A password-protected PDF is flagged and must be unlocked first. To remove or move individual pages, merge, then use “Organise pages”. The merge happens in your browser.