Line Deduplicator
Remove duplicate lines, optionally keeping order.
Input
Sponsored
How it works
How it works
- Splits on newlines, optionally trims, skips empties, and keeps the first occurrence of each line (stable).
- Membership tracking uses a
Setfor O(1) lookups; overall complexity ~O(n). - Case/whitespace sensitivity depends on your options; sorting is not performed.
Privacy & Security
All processing local.
Accuracy, Limits & Tips
Large lists limited by memory.
Examples
- Clean word lists.
- Remove duplicate emails.
Looking for broader guides and best practices? Visit the ToolsAreUs Blog for indexes (like the full tool list) and articles (e.g. secure password generation).