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Remove Duplicate Lines

Remove duplicate lines from text, CSV, and code. Keep unique lines only.

Input Text

Total lines: 1

Output (Unique Lines)

Unique lines: 1 -¢ Duplicates removed: 0

Deduplication Options

Case SensitiveTrim WhitespaceRemove Empty LinesSort Alphabetically

About Remove Duplicate Lines

Free online tool for removing duplicate lines from any text, CSV file, or code snippet. Paste or upload your text and instantly get a cleaned-up version with only unique lines - perfect for data cleanup, removing redundant CSV entries, cleaning code, and deduplicating lists. Choose to preserve line order, remove empty lines, perform case-insensitive matching, or trim whitespace before comparing. See the before and after line count, download the cleaned text, or copy it directly. Works entirely in your browser with no uploads or data retention.

Frequently Asked Questions

How does the duplicate line remover work?▾

Paste or upload your text and the tool compares each line, removing exact duplicates while preserving the first occurrence of each unique line. You can configure case-sensitivity, whitespace trimming, and empty line handling for flexible deduplication.

Does it preserve the original line order?▾

Yes. By default, the tool preserves the order of lines as they appear in your original text - it removes duplicates without reordering. You can optionally sort the unique lines alphabetically if needed.

Can I use this to clean up CSV files?▾

Yes. Upload a CSV file or paste CSV data and the tool removes duplicate rows based on exact line matching. This is useful for cleaning data exports that may contain accidental duplicate entries. The headers are preserved.

What options are available for deduplication?▾

You can enable case-insensitive matching (ignore uppercase/lowercase differences), trim whitespace before comparing (ignore leading/trailing spaces), remove empty lines entirely, and optionally sort the unique lines alphabetically.

Is this duplicate line remover free?▾

Yes, completely free with no signup, no watermarks, and no limits. Remove duplicates from any size text file instantly. All processing happens in your browser - your data is never sent to any server.

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