Remove Duplicate Lines
Remove duplicate lines from your text, keeping first or last occurrences.
A duplicate line remover scans your text and deletes repeated lines, keeping either the first or the last occurrence of each line.
How to Use the Remove Duplicate Lines
- Paste your lines. Enter your list, one item per line.
- Choose keep order. Keep the first or last occurrence of duplicates.
- Copy the result. See the deduplicated list and the counts.
This tool processes your input locally in your browser. Nothing is uploaded.
What Is Remove Duplicates?
Removing duplicate lines cleans up lists, datasets and logs by deleting repeated entries while keeping your data meaningful.
What is a duplicate line remover?
It reads each line of your text and removes lines that appear more than once. You can keep the first occurrence or the last occurrence of each repeated line.
Why deduplicate?
Duplicates waste space, inflate counts and skew analysis. Removing them is common when preparing email lists, product SKUs, tags or any line-based data.
Key Features
- Removes duplicate lines
- Keep first or last
- Shows before/after counts
- Local processing
Examples
- "apple\nbanana\napple" → "apple\nbanana" (keeping first).
Common Use Cases
- Cleaning email lists
- Deduplicating data
- Cleaning tag lists
Tips & Best Practices
- Choose "last occurrence" to keep the newest version of a line.
Limitations
- Comparison is exact; lines differing only in spacing are treated as different.
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Frequently Asked Questions
How do I remove duplicate lines?
Paste your lines into the tool and choose whether to keep the first or last occurrence.
Does it trim spaces?
No, comparison is exact, so "apple" and "apple " are different lines.
Is it free?
Yes, and it runs locally.