✂️ Line Deduplicator

Remove duplicate lines, optionally keeping order.

Input

Trim Remove empty

Output

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 Set for O(1) lookups; overall complexity ~O(n).
Case/whitespace sensitivity depends on your options; sorting is not performed.

Privacy & Security

All processing local.

Sponsored

Accuracy, Limits & Tips

Large lists limited by memory.

Examples

Clean word lists.
Remove duplicate emails.

Related tools

Sponsored

You may also like

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).