Add your input
One item or record per line.
Writing table
Remove duplicate lines
Clean lists without a spreadsheet or command line.
Privacy built inYour work stays with you
Unique lines
apple banana Orange
3duplicates removed
1blank lines removed
3lines remaining
Your work stays private in your browser while you use this tool.
What does remove duplicate lines do?
The duplicate-line remover keeps the first occurrence of each line and preserves the original order. Comparison can be case-sensitive or case-insensitive, and you can trim line edges and remove blank lines before deduplication.
- Input
- One item or record per line.
- Result
- A deduplicated, optionally sorted list.
- Price
- Free
- Account
- Not required
How to use remove duplicate lines
Choose your settings
Clean lists without a spreadsheet or command line.
Save or copy
A deduplicated, optionally sorted list.
A practical tip
Keep case sensitivity on when identifiers that differ only by case are meaningful.
When to use remove duplicate lines
Deduplicate an email-domain, keyword, or SKU list while keeping its first-seen order.
Clean repeated values copied from logs before pasting them into an issue report.
Collapse capitalization variants in a survey export with case-insensitive comparison.
Worked example
A concrete remove duplicate lines example
- Input
- apple banana apple Orange orange banana
- Settings
- Case-insensitive, trim each line, remove blank lines
- Result
- apple banana Orange 3 duplicate lines and 1 blank line are removed; 3 lines remain.
What to expect
How it works
Line endings are normalized first. Each line is optionally trimmed, blank lines are optionally skipped, and a comparison key is created with or without case folding. A line is emitted only the first time its key appears.
Know before using
Limits and edge cases
- Only complete lines are compared; the tool does not find near-duplicates, spelling variants, or repeated phrases within a line.
- Output stays in first-occurrence order and cannot be sorted in this tool.
Common questions
Remove duplicate lines FAQ
Is remove duplicate lines free to use?
Yes. Remove duplicate lines is free to use.
Does remove duplicate lines keep my work private?
Yes. Your work stays private while you use the tool — nothing you enter is uploaded.
Which copy of a duplicate line is kept?
The first matching line is kept. Later matches are removed, so the sequence of the surviving lines does not change.
Does trimming affect duplicate detection?
Yes. With trimming enabled, “item” and “ item ” compare as the same line and the retained output has no leading or trailing whitespace.