Remove Duplicate Lines

Paste your list and remove duplicate lines instantly — sort, deduplicate, and copy in one click.

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Text Cleaner Remove formatting & clean text Sort Lines Sort lines A–Z or shuffle Word Frequency Find top words by frequency
Options
0 lines
0 lines · 0 removed
How It Works
  1. 1Paste your list — one item per line — into the Input box.
  2. 2Duplicates are removed automatically as you type.
  3. 3Toggle options: case-insensitive, trim spaces, sort after dedup.
  4. 4Click "Copy result" and paste the clean list anywhere.

What is a duplicate line remover?

A duplicate line remover treats each line of pasted text as one entry, keeps the first time a line appears, and drops every later copy of it. It works on plain text rather than spreadsheet cells, so it's the quick option when your data is a raw list — keywords copied from a research tool, email addresses pulled from a form export, log lines, or tags merged from several sources — and you just want the unique values back without opening Excel or Sheets.

How to remove duplicate lines

  1. Paste your list — one item per line — into the Input box. Deduplication runs as you type; no button needed.
  2. Set the comparison. "Trim whitespace" is on by default, so apple and apple match. Turn on "Case-insensitive" to merge Apple and apple, and "Remove empty lines" to drop blank rows.
  3. Read the count. The stat bar under the Output box shows how many lines remain and how many were removed, so you can confirm the result before using it.
  4. Optionally sort. "Sort A–Z after dedup" alphabetises the unique lines in the same pass — handy when you also want an ordered list.
  5. Copy and paste the cleaned list wherever you need it with "Copy result".

Examples

Input (with duplicates) Output (unique lines) What happened
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]		 [email protected]
[email protected]
[email protected]		 2 removed; first occurrence of each kept, original order preserved
Apple
apple
APPLE		 Apple
apple
APPLE		 Default (case-sensitive): all three differ, so nothing is removed
Apple
apple
APPLE		 Apple With "Case-insensitive" on: 2 removed, first spelling wins
error: timeout
error: 404
error: timeout
error: timeout		 error: timeout
error: 404		 2 removed; repeated log lines collapse to one each

Frequently asked questions

Does it keep the original order of my lines?

Yes. By default the tool keeps the first time each line appears and removes only the later copies, so the order of your remaining lines is unchanged. Order only changes if you tick "Sort A–Z after dedup", which alphabetises the unique result.

Is the comparison case-sensitive?

By default, yes — Apple and apple are treated as two different lines and both are kept. Tick "Case-insensitive" to compare regardless of case; the first spelling that appears is the one kept.

How are blank lines and extra spaces handled?

"Trim whitespace" is on by default, so leading and trailing spaces are ignored when comparing — cat and cat count as duplicates. Empty lines are left in place unless you tick "Remove empty lines", which strips every blank row from the output.

How is this different from sorting a list?

Sorting reorders lines but keeps every duplicate; deduplicating removes repeats but keeps the original order. They solve different problems. If you want both — unique lines in alphabetical order — run this tool with "Sort A–Z after dedup" enabled, or use the dedicated Sort Lines tool afterwards.

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