Remove Duplicate Lines
Remove duplicate lines from text with case-sensitive and sorting options.
How to Use the Remove Duplicate Lines Tool
Paste your text into the input box above and the tool instantly removes duplicate lines. The result appears below with stats showing how many duplicates were found.
Options
- Case-sensitive — when enabled, "Hello" and "hello" are treated as different lines. Disable to ignore case when comparing.
- Trim whitespace — removes leading and trailing spaces before comparing lines, so " hello " matches "hello".
- Sort output — sorts the unique lines alphabetically after deduplication.
Common Use Cases
Clean up CSV files, remove repeated log entries, deduplicate email lists, tidy up code imports, or prepare unique keyword lists. The tool keeps the first occurrence of each line and discards later duplicates.
Frequently Asked Questions
Does this tool preserve the original line order?
Yes. The first occurrence of each line is kept in its original position. Later duplicates are removed. Enable "Sort output" if you want alphabetical order instead.
Is the comparison case-sensitive by default?
Yes. By default "Apple" and "apple" are treated as different lines. Uncheck "Case-sensitive" to treat them as duplicates.
Does my text get uploaded anywhere?
No. Everything runs in your browser. Your text never leaves your device.
Can I remove duplicate lines from a CSV file?
Yes. Copy the contents of your CSV file and paste them into the input box. Each row is treated as a line, and duplicate rows will be removed.
What happens with empty lines?
Empty lines are treated like any other line. If there are multiple empty lines, only the first one is kept.
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