Remove Duplicate Lines

Strip duplicate lines from any list — keep order, ignore case or spacing, and see how many were removed.

Stays on your device. This tool runs in your browser — nothing you paste or open ever leaves it. Nothing uploaded, nothing to leak.

Your list

Ignore case Trim whitespace

Unique lines

Run the tool first — there’s no result to send yet.

How to remove duplicate lines

Paste your list and the de-duplicated version appears instantly, with a count of how many duplicates were dropped. Turn on "ignore case" so Apple and apple count as the same, and "trim whitespace" so trailing spaces do not make two identical lines look different. The first time each line appears is the one kept.

Remove Duplicate Lines — TechWhack Score

9.3/10

Privacy 10/10

De-duping runs in the browser — your list is never uploaded.
Speed 10/10

Removes duplicates the instant you paste.
Features 7/10

Keeps the first occurrence and your original order, can ignore case and whitespace, and tells you how many lines it removed.
Free 10/10

No sign-up, no per-hour throttle, embeddable.

Verdict: De-dupes while keeping your order, with a removed-count — and no per-hour cap like the throttled tools.

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This tool removes repeated lines from a block of text or a list, keeping the first occurrence of each. TechWhack can ignore case and surrounding whitespace when deciding what counts as a duplicate, preserves your original order, and tells you how many lines it removed — all in your browser.

When this is the right tool

Cleaning an email or keyword list, merging two files, de-duping log lines or CSV rows — anywhere the same line shows up more than once. Because it keeps original order by default, it is safe for lists where sequence matters; pair it with the Sort Text tool if you also want them ordered.

FAQ

Does removing duplicate lines keep the original order?Yes. The first time a line appears it is kept in place, and only later repeats are removed, so the remaining list stays in its original order. It also reports how many lines were removed.

Can it treat lines with different capitalization as duplicates?Yes. Turn on the ignore-case option and Apple and apple are treated as the same line, so only one is kept. Leave it off when capitalization is meaningful and should be preserved.

Will extra spaces stop it from catching duplicates?By default a line with trailing or leading spaces counts as different text. Enable the ignore-whitespace option so lines that differ only in spacing are matched and deduplicated.

What is the difference between removing duplicates and sorting?Removing duplicates keeps your lines in their existing order and only deletes repeats, while sorting reorders everything alphabetically or numerically. Use this tool when order matters; use a sort tool when you also want to rearrange the list.