Remove Duplicates
Remove duplicate lines from text
🗑️ Remove Duplicate Lines - Data Cleaning & List Deduplication Tool
Clean your data instantly by removing duplicate lines from any text. Perfect for data analysts processing CSV files, marketers deduplicating contact lists, and developers cleaning log files.
✅ Perfect For:
- • Deduplicate marketing email lists
- • Clean database exports & CSV files
- • Remove duplicate log entries
- • Merge multiple contact lists
⚡ Key Features:
- • Case-sensitive/insensitive matching
- • Ignore whitespace differences
- • Preserve original data order
- • Detailed statistics & counts
❓ Frequently Asked Questions
How do I remove duplicates from an email list?
Paste your email list (one per line), enable "Case-insensitive" matching since email addresses aren't case-sensitive, and enable "Ignore whitespace" to catch emails with extra spaces.
What's the difference between case-sensitive and case-insensitive?
Case-sensitive treats "John" and "john" as different entries. Case-insensitive treats them as duplicates. Use case-insensitive for email addresses, usernames, or names.
Can I process large files with thousands of lines?
Yes! Our tool uses optimized Set-based algorithms that process thousands of lines in milliseconds. There's no practical limit - we've tested with files containing 100,000+ lines.
Will the tool change the order of my data?
No! The tool preserves the first occurrence of each unique line in its original position, maintaining chronological order and data integrity.