The tool "reorganize PDF" is the best ever, there you can add multiple PDFs to combine them, delete individual pages or re-order the pages however you want. Acrobat is 240.- CHF a year and requires admin work, such as changing the Kostenstelle each year. This tool is free and can do quite a lot of things. Of course, you shouldn't use it for sensitive data as it's a SaaS.
No registration needed
PDF Files are uploaded to the cloud and edited there
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