Remove duplicate lines
Dedupe runs locally and keeps your pasted data private.
Why this tool works well
- Deduplicates large pasted line sets quickly.
- Optional trimmed comparison handles messy spacing.
- Runs entirely client-side for privacy.
- After merging two email lists or contact exports, remove duplicates to ensure no recipient receives the same message twice. Paste the combined list, remove duplicates, and copy the clean result.
- Log files often contain repeated warning or error lines. Removing duplicates gives a cleaner view of the unique error types present without the noise of repeated identical entries.
Use cases
Keyword cleanup
Remove repeated SEO terms from working lists.
Log processing
Reduce repeated entries before manual review.
Inventory prep
Normalize item lists before sorting or import.
Practical examples
Simple dedupe
Input: apple / apple / orange
Output: apple / orange
Trim compare
Input: item and item
Output: Single kept line with trim mode on
Suggested workflow
FAQ
Does order stay the same?
Yes, the first occurrence order is preserved.
Can it ignore leading and trailing spaces?
Yes, enable trim-compare mode.
Does the tool preserve the original order of lines?
Yes. The first occurrence of each unique line is kept in its original position. Only subsequent duplicate occurrences are removed. The relative order of the remaining unique lines is unchanged.
Can I remove near-duplicates or lines that differ only in whitespace?
The tool compares exact line content after optional case normalisation. Lines that differ only in leading/trailing whitespace can be handled by enabling the trim-whitespace option before deduplication.
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