A list pasted from a spreadsheet, a log file, or a merged export usually has repeats scattered all through it, never conveniently grouped, which makes them tedious to catch by eye. This strips repeated lines and shows how many times each one appeared, so you get the scale of the duplication alongside the cleaned result.
When you'd use this
Deduping an email list before a mailmerge, cleaning up a SKU list merged from two sources, or removing repeated log lines before searching through them for a specific event.
Common errors
Two lines that look identical but escape being caught as duplicates usually differ in trailing whitespace or in capitalization. Check whether the comparison needs to be case-insensitive for your particular list.
Frequently asked questions
Does this preserve the original order of the list?
By default, yes. The first occurrence of each line stays where it was and only the later repeats go. A separate sort option alphabetizes the deduplicated result if you'd prefer that order.
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