Remove Duplicate Lines
Delete repeated lines from a list while keeping the original order.
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How do you remove duplicate lines?
When a merged list has the same entries twice, paste it here and every repeat after the first disappears while the surviving lines keep their original order. Turn on “ignore case” to treat “Berlin” and “berlin” as one entry, or “trim lines” to catch copies that differ only by stray spaces. A 5,000-row export dedupes in one pass.
How to use the Remove Duplicate Lines
- 1 Feed the tool your list, one record per line.
- 2 Tick “ignore case” or “trim lines” if near-matches should count as duplicates.
- 3 Review the cleaned list; each surviving line is the first of its kind.
- 4 Copy the unique lines back out.
What you can use it for
- Cleaning duplicate entries from email or keyword lists.
- De-duplicating log files or CSV columns.
- Removing repeated lines after merging documents.
- Building a unique list from messy data.
Frequently asked questions
Does it keep the original order?
Yes. Each line keeps the position of its first appearance; only the later copies vanish. Nothing is re-sorted, which matters when list order carries meaning.
Can it ignore case and spacing?
“Ignore case” makes “Apple” and “APPLE” compare as equal, and “trim lines” discounts leading and trailing whitespace, so visually identical entries are caught even when the raw text differs.
Can it dedupe a CSV column?
Yes, if you paste the column one value per line. Full CSV rows work too, but a whole row must match another exactly to count as a duplicate, unless trimming is enabled.
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