Question 1

What is the difference between dedupe mode and “Process only”?

Accepted Answer

Dedupe mode decides which duplicate survives (first, last, unique only, duplicates only). “Process only” pre-filters the range, e.g. dedupe emails or numeric lines only.

Question 2

When should I use “Ignore leading numbering” or “Remove contained items”?

Accepted Answer

Ignoring numbering cleans lists prefixed with “1.” or “2)”. Removing contained items drops short lines contained in longer ones — handy for keyword and tag lists.

Question 3

Is my data uploaded?

Accepted Answer

No. Everything runs locally in your browser; your text never leaves your device.