Does the tool preserve the original order of lines?

Yes, by default the tool keeps lines in their original order and removes subsequent duplicates. Enable "Sort lines" to alphabetically sort the output.

Is the comparison case-sensitive?

By default, the comparison is case-sensitive, so "Apple" and "apple" are treated as different lines. Enable "Ignore case" to treat them as duplicates.

Can I remove blank lines too?

Yes! Enable the "Remove blank lines" option to strip out all empty lines from the output along with duplicates.

What is the maximum input size?

The tool can handle very large inputs (500,000+ lines) since all processing is done locally in your browser memory.

Will leading or trailing spaces affect matching?

Only if whitespace trimming is disabled. Enable "Trim whitespace" to normalize lines before comparing, so " apple " matches "apple".

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Remove Duplicate Lines

Remove duplicate lines from text, sort lines, and clean up lists instantly.

Case insensitiveSort lines A-ZTrim whitespaceRemove blank lines

Input (1 lines)

Output (0 unique lines)

How to Use Remove Duplicate Lines

1
Paste your text with duplicate lines into the input box.
2
Configure options: case sensitivity, sort order, trim whitespace, remove blanks.
3
Click "Remove Duplicates" to process the text.
4
Review the cleaned output and the count of removed duplicates.
5
Click "Copy" to copy the result to your clipboard.

About Remove Duplicate Lines

The Remove Duplicate Lines tool quickly cleans up any text by eliminating repeated lines, with options to sort alphabetically, ignore case, trim whitespace, and remove blank lines. This is perfect for cleaning up exported spreadsheet data, email lists, keyword lists, log files, and any text where duplicates need to be eliminated.

Data analysts, SEO professionals managing keyword lists, developers cleaning log outputs, and marketers deduplicating email lists all rely on this type of tool daily. What would take minutes of manual work or complex Excel formulas is done in under a second here.

The tool handles large inputs — paste in thousands of lines and get clean, deduplicated output instantly. No data is sent to a server; all processing happens locally in your browser for complete privacy.