Duplicate Line Remover

Remove duplicate lines from lists, CSV exports, and messy pasted text in one click.

1
Original lines
1
Unique lines
0
Duplicates removed
Deduplicated lines
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What this tool does

Exported email lists, CSV dumps, and copy-pasted URLs often contain duplicates that skew counts and break imports.

Deduplication preserves the first occurrence of each line so order stays intact — useful when sequence matters.

How to use it

  1. 1

    Paste your text with duplicate lines into the input box.

  2. 2

    Choose whether to match lines case-sensitively or ignore case.

  3. 3

    Copy the cleaned list — duplicates removed locally in your browser.

Workflow tips

Run dedupe before sorting — otherwise duplicates may scatter through a sorted list visually.

Case-insensitive mode treats "Apple" and "apple" as the same line.

Tips

  • Trim whitespace first with the whitespace remover for cleaner dedupe results.
  • Export deduped lists immediately — browser refresh clears unsaved work.

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Frequently asked questions

Does it preserve line order?▼

Yes. The first occurrence of each line is kept; later duplicates are removed while order stays intact.

Can I remove empty lines too?▼

Use the whitespace remover tool to strip blank lines after deduplicating.