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Line Deduplicator - Remove Duplicate Lines from Text Online

Free online line deduplicator that removes duplicate lines from text data while preserving formatting and order. Perfect for cleaning up lists, logs, data files, and text documents with advanced sorting and filtering options.

Text Input

Deduplicated Results

Enter text with duplicate lines and click "Remove Duplicates" to see the cleaned results.

✅ Preserves original order
✅ Case-sensitive or insensitive options
✅ Advanced filtering and sorting

Deduplication Options
Basic Options:
Output Filtering:
Sorting Options:

How It Works

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Paste Your Text Data

Enter or paste text containing duplicate lines - supports lists, logs, CSV data, or any line-based text format. Processing happens entirely in your browser with no data uploads.

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Configure Deduplication Options

Choose case sensitivity, whitespace trimming, empty line removal, sorting options, and whether to show only duplicates or unique lines. Customize the processing to match your needs.

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Process Lines Instantly

Click 'Remove Duplicates' to process your text. The tool identifies duplicate lines, preserves original order (optional), and provides detailed statistics about the cleanup process.

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Download Clean Results

Copy cleaned text to clipboard or download as a text file. Perfect for data preparation, list management, log analysis, and content deduplication workflows.

Frequently Asked Questions

Is this line deduplicator free to use?
Yes, this line deduplicator is completely free with no limits on the amount of text you can process. No registration required, and no watermarks added to processed text.
Is my text data uploaded to your servers?
No, all text processing happens locally in your browser. Your data never leaves your computer, ensuring complete privacy and security for sensitive information.
How does case sensitivity work?
When case-sensitive mode is enabled, "Apple" and "apple" are treated as different lines. When disabled, they are considered duplicates and only one will be kept in the output.
Can I preserve the original order of lines?
Yes, by default the tool preserves the original order by keeping the first occurrence of each unique line. You can also sort the output alphabetically if preferred.
What happens to empty lines?
Empty lines are counted and can be automatically removed if desired. The statistics will show how many empty lines were found and removed during processing.
Can I see only the duplicate lines?
Yes, you can configure the tool to show only lines that appear more than once, or only lines that appear exactly once (unique lines). This is useful for analysis purposes.
How large files can I process?
The tool can handle large text files efficiently in your browser. Processing time depends on your device performance, but typical files with thousands of lines process in milliseconds.
Does whitespace trimming affect the comparison?
When whitespace trimming is enabled, leading and trailing spaces are removed before comparison. This helps identify lines that are essentially the same but have different spacing.

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