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🧹 Remove Duplicate Lines
Remove duplicate lines from any text and clean whitespace, perfect for tidying lists, logs, CSV columns, and keyword sets before reuse or sharing quickly.
Remove Duplicate Lines
Deduplicate line lists with normalization controls, keep-first/last logic, and exportable audit trails.
Input lines: 5Unique lines: 3Removed duplicates: 2
| Line | Normalized | Count | Kept |
|---|---|---|---|
| a | a | 2 | Yes |
| a | a | 2 | No |
| b | b | 2 | Yes |
| c | c | 1 | Yes |
| B | b | 2 | No |
How to use this tool
- Paste line-based data into the input area.
- Set normalization and keep-first/keep-last behavior.
- Review deduped output and export audit logs.
Data prep
- Case and trim options prevent false duplicate mismatches.
- Keep-last mode is useful when latest entries should win.
- Audit table reveals which rows were removed and why.
Operational usage
- Use TXT output for cleaned import lists.
- CSV export supports review in spreadsheets.
- JSON report preserves run options for reproducibility.
FAQ
- Are empty lines preserved?
- No. Empty or whitespace-only lines are skipped.
- Can I keep last duplicate instead of first?
- Yes. Use keep mode to choose first or last occurrence.
- Is this server-side processing?
- No. Dedupe runs entirely in-browser.
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