Does this keep the first or last occurrence of a duplicate?

It keeps the first occurrence of each unique line and removes any later repeats.

Can I make it ignore capitalization?

Yes — enable the "Ignore case when comparing" option.

Does it remove blank lines?

Blank lines are treated as duplicates of each other like any other repeated line, so only the first blank line is kept.

Is my list uploaded anywhere?

No — everything runs locally in your browser.

Does it reorder my list?

No — the original order is preserved; only repeated lines are removed.

Is there a limit on list size?

No hard limit — very large lists are only limited by your device's available memory.

Текстовые инструменты

Удаление дублей строк — Бесплатный онлайн-инструмент

Удаляйте повторяющиеся строки из списка, сохраняя первое вхождение.

Использовать этот инструмент

Работает в браузере
Мгновенные результаты
100% приватно

Your Text

Ignore case when comparing Trim whitespace before comparing

Узнать больше

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.

Кто использует этот инструмент?

Для бизнеса

Clean a mailing list that has been merged from multiple sources.

Для личного использования

Deduplicate a to-do or shopping list copied from several places.

Для студентов

Remove repeated citations accidentally pasted twice into a reference list.

Для офисов

Clean up a list of usernames or IDs before importing into a system.

Зачем использовать этот инструмент

Основные возможности

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.

Результат

Преимущества

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.

Пошагово

Как использовать Удаление дублей строк

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.

Характеристики

Технические детали

Параметр	Значение
Ввод	Plain text lists, one item per line
Обработка	No practical limit — handled entirely by your browser
Вывод	Exact matching, first-occurrence-kept order

Это можно проверить

Конфиденциальность и безопасность

Что на самом деле происходит с вашим файлом при использовании этого инструмента.

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.

Как улучшить результат

Советы

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.

Часто задаваемые вопросы