Remove Duplicate Lines
Strip repeated lines and count what was removed.
How to use
- 1 Paste your lines into the box.
- 2 Choose case-insensitive matching or whitespace trimming if needed.
- 3 Pick whether to keep the first or last copy of each line.
- 4 Copy the de-duplicated text and check the removed count.
About Remove Duplicate Lines
Remove Duplicate Lines deletes repeated lines from a list while keeping the order of what remains, and tells you exactly how many were dropped.
You can match case-insensitively so that "Apple" and "apple" count as the same line, ignore surrounding whitespace so a stray space no longer hides a duplicate, and choose whether to keep the first or the last occurrence of each repeated entry.
It is the fastest way to clean a mailing list, a set of log lines, a column of IDs, or any export that has accumulated copies.
Compared with a spreadsheet formula or a one-off script, it is instant and needs no setup, and because the de-duplication happens locally in your browser, even sensitive lists stay private.
The removed-count badge makes it easy to confirm the tool did what you expected before you copy the result back out.
Pair the case-insensitive and trim options when your data has been touched by several different people or systems, since those are the situations where near-identical lines most often slip through unnoticed.
FAQ
Does it preserve the original order?
Yes — surviving lines stay in their original order; only the repeats are removed.
What does keep-first versus keep-last do?
It decides which copy of a repeated line survives: the first time it appears, or the last.