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How to Use
- 1Paste your text with duplicate lines into the input area.
- 2Click Remove Duplicates to strip all repeated lines.
- 3Optionally toggle Sort to arrange remaining lines alphabetically.
- 4Review the count of removed duplicates shown in the output.
- 5Click Copy to save the cleaned result to your clipboard.
About Duplicate Line Remover
The Duplicate Line Remover scans your text line by line and removes every repeated occurrence, keeping only the first instance of each unique line. An optional alphabetical sort organizes the remaining entries from A to Z.
Ideal for cleaning email lists, log files, CSV exports, DNS records, or any text where repeated entries create clutter. Paste thousands of lines and get a deduplicated result in milliseconds — no manual scanning required.
All processing runs entirely in your browser. Your text is never transmitted to any server, so it is safe for deduplicating sensitive data like customer records, internal URLs, or system logs.
Frequently Asked Questions
Is the duplicate comparison case-sensitive?
Yes. 'Hello' and 'hello' are treated as different lines. If you need case-insensitive deduplication, convert your text to lowercase first using a case converter tool.
Are blank lines removed?
Blank lines are preserved unless they appear more than once — in that case, only one blank line is kept, just like any other duplicate.
Does it preserve the original line order?
Yes. Without the Sort option, lines appear in their original order with duplicates removed. Enable Sort to rearrange them alphabetically.
Can I remove duplicates from a CSV column?
If each value is on its own line, yes. For multi-column CSV data, extract the column first, then paste it here to deduplicate.
Is there a line limit?
No hard limit. The tool runs in your browser and can handle tens of thousands of lines efficiently.