TetraKitsDuplicate Line Remover
Paste text with repeated lines to remove duplicates instantly — keep the first occurrence of each line with optional case-sensitive matching and copy the clean result.
Read: Duplicate Line Remover Guide: Deduplicate Text Online →
- Free to Use
- No Signup
- Privacy Friendly
How to remove duplicate lines
- 1
Paste your text
Enter or paste text with one item per line — email lists, URLs, keywords, or log entries.
- 2
Set matching mode
Toggle case-sensitive to treat "Apple" and "apple" as different lines when needed.
- 3
Copy clean output
Duplicates are removed live — copy the deduplicated result from the output field.
Deduplication logic
The tool splits input by line breaks, tracks seen lines in a set, and outputs only the first occurrence of each unique line.
- First wins — the earliest duplicate is kept; later copies are dropped
- Case-sensitive — "Test" and "test" are different when enabled
- Blank lines — empty lines are deduplicated like any other line
Why Use This Tool?
Instant Dedup
Duplicates removed as you type — no button needed.
Case Control
Match lines exactly or ignore letter case.
List Cleaning
Clean email lists, URLs, and keyword sets fast.
Private
Your text never leaves the browser.
Frequently Asked Questions
Which duplicate is kept?
The first occurrence of each unique line is kept; subsequent duplicates are removed.
Does it work on CSV data?
It deduplicates whole lines. For column-level dedup, split columns first or use a spreadsheet.
Are blank lines removed?
Duplicate blank lines collapse to one unless you trim them separately.
Can I deduplicate thousands of lines?
Yes. Browser performance handles large lists; very large files may take a moment.
Is this duplicate line remover free?
Yes. Unlimited use with no signup.
Clean Lists Without Excel Formulas
Email marketing lists, SEO keyword exports, and server log extracts all accumulate duplicates. Paste the list, toggle case sensitivity, and get a clean unique set — faster than UNIQUE() in a spreadsheet for one-off cleanup.
