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♻️ Remove Duplicate Lines

Remove repeated lines or sentences and highlight them — fast, private, in your browser.

Paste your text:

Ignore leading/trailing spaces

Trim each line before comparing

Preserve empty lines

Case sensitive matching

Treat sentences as lines

Splits by ., !, ? while preserving original order.

Clean output (unique lines):

Removed duplicates (highlighted in original):

duplicate

Show list of removed lines

How to use

Paste your text.
Choose options (sentence mode, whitespace, case sensitivity, trim/preserve empty lines).
Click Remove Duplicates to get a clean output and see duplicates highlighted.
Copy or download your results; optionally open “Show list of removed lines”.

Remove Duplicate Lines from Text

Great for de-duping logs, lists, code snippets, or user-generated content. Keep the original order, highlight duplicates for review, and export a clean version. All processing is 100% local—your text never leaves your device.

Keep cleaning? Try Sort Lines or Find & Replace.

FAQ

Do you upload my text?

No. Everything runs in your browser; nothing is uploaded.

What does “Treat sentences as lines” do?

It splits by sentence terminators (., !, ?) and removes duplicates at the sentence level.

Will empty lines be removed?

Enable Preserve empty lines to keep them; otherwise empty lines may be normalized during cleaning.