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.

Outils de Texte

Suppression des Lignes en Double — Outil en Ligne Gratuit

Supprimez les lignes répétées d'une liste en gardant la première occurrence.

Utiliser Cet Outil

Fonctionne dans Votre Navigateur
Résultats Instantanés
100% Privé

Your Text

Ignore case when comparing Trim whitespace before comparing

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.

Qui Utilise Cet Outil ?

Pour les Entreprises

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

Pour un Usage Personnel

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

Pour les Étudiants

Remove repeated citations accidentally pasted twice into a reference list.

Pour les Bureaux

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

Pourquoi Utiliser Cet Outil

Fonctionnalités Clés

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.

Le Résultat

Avantages

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.

Étape par Étape

Comment Utiliser Suppression des Lignes en Double

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.

Spécifications

Détails Techniques

Détail	Valeur
Entrée	Plain text lists, one item per line
Traitement	No practical limit — handled entirely by your browser
Sortie	Exact matching, first-occurrence-kept order

Vous Pouvez le Vérifier

Confidentialité & Sécurité

Ce qui se passe réellement avec votre fichier lorsque vous utilisez cet outil.

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.

Obtenir de Meilleurs Résultats

Astuces

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.

Questions Fréquentes