Duplicate Line Remover
Remove duplicate lines from text files, lists and logs instantly. Keep only unique lines with case-sensitive and whitespace trimming options.
How to Use the Duplicate Line Remover
Clean up your lists by removing duplicate entries while preserving the original order. Perfect for email lists, URLs, log files or any line-based data. After removing duplicates, use our Word Counter to analyze your cleaned data or the Case Converter to standardize text formatting.
1. Enter Your Text
Paste your text into the input box or upload a .txt file. Each line should contain one item (email, URL, entry, etc.). The tool works with lists of any length and processes them instantly.
2. Configure Options
Choose how to handle duplicates:
- Case Sensitive: Treat uppercase and lowercase as different ("Hello" ≠ "hello")
- Trim Whitespace: Ignore leading/trailing spaces when comparing lines
3. Remove Duplicates
Click Remove Duplicates to process your text. The unique lines will appear in the output area, maintaining their original order.
4. Copy or Download
Copy the deduplicated text directly or download it as a .txt file using the export button. All processing happens in your browser for complete privacy.
Common Use Cases
- Email Lists: Remove duplicate contacts, subscribers and recipients before sending campaigns
- URL Management: Clean website lists, sitemaps and link collections for SEO audits
- Log Files: Remove repeated error messages, warnings and duplicate log entries for analysis
- Data Cleanup: Deduplicate CSV exports, database dumps and data migrations
- Todo Lists: Remove duplicate tasks, action items and checklist entries
- Testing & QA: Clean test data, sample datasets and remove duplicate test cases
- Content Management: Remove duplicate keywords, tags or metadata entries