Remove Duplicates
Remove duplicate lines
alpha bravo Alpha charlie delta delta echo
What is Remove Duplicates?
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 Remove Duplicates?
- 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 Remove Duplicates?
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.
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.