Line Deduplicator – Remove Duplicate Lines from Text
Remove duplicate lines from text with case sensitivity options, trim whitespace, and preserve or reorder unique lines.
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› About this tool · FAQ
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.
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.