How do I remove duplicate lines from text online?

Paste one entry per line, choose options such as case-insensitive matching and trim whitespace, then click Remove Duplicates.

Is my text uploaded to your servers?

Processing runs in your browser with JavaScript. Lists are not sent to us.

Does deduplication keep the original order of unique lines?

Yes. The first time a line appears is kept; later copies are dropped.

Why use trim whitespace when removing duplicates?

Leading or trailing spaces can make two identical lines register as different strings.

How many lines can I deduplicate?

There is no fixed cap. Large pastes depend on your device memory.

Can I copy or download the cleaned list?

Yes. Use Copy for clipboard or Download for a plain text file.

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Remove Duplicate Lines

Q: What does case-insensitive duplicate removal do?

When enabled, comparisons ignore letter case so Apple and apple count as one line.

Paste any line-based list and strip repeats in seconds. Built for deduping keywords, URLs, emails, SKU codes, and log entries with optional casefolding, whitespace trim, and blank-line removal — all client-side.

Your List (One item per line)

Cleaning Options

Case Insensitive (A = a) Trim Whitespace Remove Empty Lines

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Duplicate line remover for keywords, CSV paste, and plain lists

People search “remove duplicate lines,” “dedupe text,” and “unique lines only” when cleaning exports from spreadsheets, ad platforms, or scrapers. This page keeps one copy of each row while respecting your choice of strict or relaxed matching.

Case insensitive merges rows that differ only by capitalization. Trim whitespace fixes spaced duplicates. Remove empty lines drops blank rows before counting uniqueness.

Local JavaScript dedupe

A Set tracks lines you have already seen while scanning top to bottom, so long pasted lists dedupe quickly without round trips to a backend.

Data stays on your machine

Sensitive imports stay in your tab until you clear them. Use Copy or Download only when you are ready to move results elsewhere.

Frequently Asked Questions

Paste one item per line, set options like case-insensitive matching and trim whitespace, then run Remove Duplicates. You get unique rows plus counts for lines removed and kept.

Deduping runs in your browser with JavaScript. Your pasted list is not uploaded to us as part of using this tool.

When checked, comparisons ignore letter case, so Apple and apple count once. When unchecked, strings must match exactly, including capitalization.

Yes. The first occurrence of each line stays; repeats later in the file are removed. Kept lines stay in the same top-to-bottom order as your input.

Extra spaces at the start or end of a line can make two rows look the same but compare unequal. Trim strips those edges before duplicate detection so spacing alone does not create extra uniques.

We do not set a hard maximum; huge pastes depend on your RAM and browser tab limits. Most everyday lists finish immediately because processing stays on your device.

Yes, after processing, you can either copy the cleaned list to your clipboard with one click, or download it as a plain text file.

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