Remove Duplicate Lines
Remove duplicate lines, find unique entries, sort text & clean up lists. Fast, free & privacy-first.
How to Use
- Paste your text with one item per line into the Input panel.
- Set options — case sensitivity, trim whitespace, remove empty lines, sort.
- Click Remove Duplicates to get unique lines only.
- Or click Show Duplicates to see which lines appeared more than once.
- Click Copy to copy the cleaned result.
Features
Remove Dupes
Keep only unique lines from your text.
Show Duplicates
Find and display only the duplicate entries.
Smart Options
Case insensitive, trim, sort, remove empties.
Statistics
See how many duplicates were found and removed.
Use Cases
- Email Lists: Remove duplicate email addresses from mailing lists.
- Data Cleaning: Deduplicate CSV data, log entries, or database exports.
- Keyword Lists: Clean up SEO keyword lists and remove repeats.
- Code: Remove duplicate imports, CSS classes, or configuration entries.
- Inventory: Find duplicate product names or SKUs in spreadsheet data.
Benefits
- Instant deduplication with real-time statistics.
- Two modes: remove duplicates or show only duplicates.
- Options for case sensitivity and whitespace handling.
- Built-in sorting for organized output.
- 100% private — text never leaves your browser.
Why Remove Duplicate Lines?
Duplicate data is one of the most common data quality issues. Whether you are working with email lists, spreadsheet exports, log files, or keyword research, duplicates waste space, skew analytics, and cause errors. This tool gives you a fast way to clean any text-based list by removing exact or case-insensitive duplicates with a single click.
Data Cleaning Workflow
After removing duplicates, count the remaining items with the Word Counter. Format your cleaned data with the Text Case Converter for consistency. If your data is in JSON format, format it with the JSON Formatter. For code-related deduplication, test your results in the Online Code Editor.
Frequently Asked Questions
Does it preserve the original order?
Yes. When duplicates are removed, the first occurrence of each line is kept in its original position. Enable "Sort A–Z" to sort alphabetically instead.
What does Case Insensitive mean?
When enabled, "Apple" and "apple" are treated as the same line. The first occurrence's casing is preserved in the output.
What does Show Duplicates do?
Instead of removing duplicates, it shows only the lines that appeared more than once, helping you identify repeated entries.
Does it handle large files?
Yes. The tool processes text entirely in your browser and can handle thousands of lines efficiently.
Is my data secure?
Yes. All processing runs locally in your browser. No data is sent to any server.
Can it remove duplicates from CSV data?
It removes duplicate rows. For column-level deduplication in CSVs, you would need a spreadsheet tool.
Is it free?
Yes, 100% free with no limits.