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Why this runs on your computer

There is no upload: The work happens in this tab. Your file never travels, so there is no copy of it anywhere but your own disk.
Nothing to delete later: Sites that upload promise to delete your file afterwards. That promise only matters because the file was theirs to hold.
It works with the Wi-Fi off: The honest test. Turn off your connection and the tools keep working, because everything they need is already here.

Remove duplicate lines and sort a list

Remove duplicate lines and sort a list - here in this tab, with nothing uploaded.

How to remove duplicate lines

Paste your list, one item per line.
Choose how to sort and what to remove.
Copy the cleaned list.

Why this one stays private

Lists are emails, customers and keywords. This cleans yours in the tab and sends nothing anywhere.

Questions

Does it keep the first or last duplicate?

The first. Unsorted, the list keeps its original order otherwise.

Is 'Apple' a duplicate of 'apple'?

Only if you tick 'Ignore case'.

How does numeric sorting work?

Numbers are compared as numbers, so 10 comes after 9 rather than after 1.