Remove Duplicate Lines
Remove duplicate lines
alpha bravo Alpha charlie delta delta echo
What is Duplicate Line Remover?
Remove duplicate lines from a block of text. Options for case-insensitive matching, whitespace trimming, preserving or re-sorting order, and removing empty lines. Handy for de-duplicating email lists, log files, CSV rows (line-based; use proper CSV tools for column-aware dedup), or any line-oriented data.
How do I use Duplicate Line Remover?
- Paste text (one item per line) into the input panel.
- Toggle options: keep order, ignore case, trim whitespace, drop empties.
- Copy or download the deduped result.
When should I use Duplicate Line Remover?
Dedup Lines treats each line as a token. For column-aware duplicate removal in a CSV, Excel or a database is a better fit. For sorting rather than dedup, use Sort Lines.
Frequently asked questions
Is the comparison case-sensitive?
Yes by default; "Apple" and "apple" are treated as different lines. Toggle "Ignore case" to merge them.
Can I keep the original order?
Yes. The tool preserves the first occurrence of each line in order. Switch to "Sort alphabetically" if you prefer sorted output.
Does it trim whitespace?
By default, no; "foo" and "foo " stay distinct. Toggle "Trim whitespace" to collapse them into one entry.
Is my file uploaded anywhere?
No. Everything runs in your browser. Your files never leave your device, and there is no server component for this tool.
Tools that pair well with Duplicate Line Remover
- Line Sorter alphabetical / reverse / natural, free and in your browser.
- Text Compare Tool diff checker with highlights, free and in your browser.
- Case Converter camelcase, snake_case, etc., free and in your browser.
- Line Counter count lines in any text, free and in your browser.