중복 줄 제거기 — 무료 온라인 도구
첫 번째 항목을 유지하면서 목록에서 반복되는 줄을 제거합니다.
- 브라우저에서 실행
- 즉시 결과 확인
- 100% 비공개
What Is a Duplicate Line Remover?
A duplicate line remover scans a list, line by line, and removes any repeated entries while keeping the first occurrence of each — leaving the list in its original order, just without the repeats.
It is a fast way to clean up an email list, a set of tags, or a list of URLs that has accumulated repeated entries from being copied and merged multiple times.
누가 이 도구를 사용하나요?
비즈니스용
Clean a mailing list that has been merged from multiple sources.
개인 사용
Deduplicate a to-do or shopping list copied from several places.
학생용
Remove repeated citations accidentally pasted twice into a reference list.
사무실용
Clean up a list of usernames or IDs before importing into a system.
주요 기능
Keeps Original Order
The first occurrence of each line is kept, in its original position.
Optional Case-Insensitive Matching
Treat differently-cased duplicates as the same line if you choose.
Instant Results
Duplicates are removed immediately as you edit your list.
100% Private
Your list is never uploaded or stored.
이점
Cleaner Lists
Remove accidental repeats without manually scanning line by line.
See What Changed
A short note reports exactly how many duplicate lines were removed.
No Signup Needed
Paste, clean, copy — no account required.
중복 줄 제거기 사용 방법
Paste Your List
Add the list that may contain duplicate lines.
Review the Result
Duplicate lines are removed automatically, keeping the first occurrence.
Copy the Cleaned List
Use the Copy button to grab the deduplicated result.
기술 세부 정보
| 항목 | 값 |
|---|---|
| 입력 | Plain text lists, one item per line |
| 처리 | No practical limit — handled entirely by your browser |
| 출력 | Exact matching, first-occurrence-kept order |
개인정보 보호 및 보안
이 도구를 사용할 때 파일에 실제로 어떤 일이 일어나는지 알아보세요.
100% Client-Side
This tool runs entirely inside your browser using JavaScript — nothing you type or generate is ever sent anywhere.
No Upload, Ever
There is no file upload and no server processing step — your data never leaves your device.
Works Offline
Once this page has loaded, the tool keeps working even without an internet connection.
Nothing Stored
Nothing you enter is saved on our servers — refreshing the page clears everything.
No Tracking of Your Input
We have no way to see what you type, generate or convert with this tool.
팁
Trim Whitespace First
Enable "Trim whitespace before comparing" to catch duplicates that only differ by leading/trailing spaces.
Watch for Case Differences
Enable case-insensitive comparison if your list mixes capitalization inconsistently.