Basic PDF editor (local) (Link)
We've all been there before. You make a PDF scan on the printer and oh. You flipped it the wrong way. Sure you can put it in the browser rotate it to see it properly but you come to learn that. Rotating in the browser doesn't equal rotating the actual pages in the actual file, even if you save again! This was made to remove that pain.
There is also the case of having multiple PDFs and needing to merge them, and also deleting some of the pages.
This is similar to above, it's client sided so could be run locally. It's private, you can basically load the page, cut off your internet and it'll work. This version uses CDNs for the scripts however.
Here's the rundown of what this tool allows:
You can append different PDFs to eachother
You can reorder pages
You can delete pages
You can rotate pages
That's about it! keep in mind when appending, you better hope each "page" is relatively the same size else you end up with small pages and GIANT pages.