Remove Duplicate Lines
Remove duplicate lines from text
Frequently Asked Questions
How do I remove duplicate lines from text?
Paste your text (one item per line). The tool removes exact duplicate lines, keeping the first occurrence. Results show: unique lines, duplicates removed, and total reduction. Options: case-sensitive or case-insensitive matching. Copy the deduplicated output.
Can I remove duplicates while preserving order?
Yes. The default mode preserves the original order, keeping the first occurrence of each line. Alternatively, sort the output alphabetically or by frequency. The tool shows which lines were duplicates and how many times each appeared.
Can I remove duplicates from a CSV column?
Paste the column data (one value per line). The tool removes duplicates. For full CSV deduplication by a specific column, paste the entire CSV and select the key column. The tool removes rows with duplicate values in that column.
How do I find duplicates without removing them?
Use the "highlight duplicates" mode. The tool marks duplicate lines without removing them, showing the count for each. This helps you review duplicates before deciding which to keep. Export the duplicate list separately for analysis.
Can I remove near-duplicates or similar lines?
Enable fuzzy matching to find lines that are similar but not identical. Set a similarity threshold (80-99%). The tool uses Levenshtein distance to identify near-duplicates. Useful for cleaning data with slight variations in spelling or formatting.