6 lines
2 lines
Enter text lines in the left textarea (one item per line)
Toggle 'Case sensitive' to control whether uppercase and lowercase are treated differently
Click 'Count Duplicates' to find and count duplicate lines
Use 'Copy' or 'Export' buttons to save the duplicate results
Enter text lines in the left textarea (one item per line)
Toggle 'Case sensitive' to control whether uppercase and lowercase are treated differently
Click 'Count Duplicates' to find and count duplicate lines
Use 'Copy' or 'Export' buttons to save the duplicate results
Count Duplicate Lines is a powerful, free online tool designed to help you analyze text data by identifying and counting how many times each unique line appears in your input. Whether you are working with large datasets, cleaning up email lists, analyzing log files, or managing inventory records, this powerful duplicate counter provides instant insights into your data composition with real-time statistics showing total lines, unique items, and duplicate counts.
Unlike simple duplicate removers that just eliminate redundant lines, our Count Duplicate Lines tool goes further by quantifying exactly how many times each item appears. This frequency analysis is invaluable for data quality assessment, inventory management, keyword research, and identifying patterns in your datasets. The formatted output displays each unique line followed by its occurrence count in parentheses (x2, x3, etc.), providing clear, readable results.
The tool intelligently handles case sensitivity, allowing you to choose whether "Apple" and "apple" should be counted as the same or different items, giving you complete control over your duplicate analysis. The optional "Show All Lines" feature lets you switch between viewing only duplicated items or seeing the complete frequency distribution of every unique line in your dataset, making it versatile for both quick duplicate checks and comprehensive data profiling.
This tool works entirely in your browser - no data is sent to any server, ensuring your information remains completely private and secure. Perfect for developers, data analysts, content managers, and anyone dealing with list-based data, it processes thousands of lines instantly with one-click copying and file export capabilities to easily integrate results into your workflow.
Shows exact count (x2, x3, etc.) for each duplicate line, providing precise frequency analysis for your data.
Toggle between duplicates-only view or complete frequency distribution. Choose to show only lines that appear multiple times or display all lines including unique ones (x1) for comprehensive data profiling.
Choose whether to treat "Apple" and "apple" as the same or different items. This gives you complete control over your duplicate analysis based on your specific data requirements.
Displays total lines, unique items, and duplicate count instantly in an easy-to-read dashboard. Track your data composition at a glance with visual statistics cards.
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