Remove duplicate lines from any block of text, with options for case sensitivity and whitespace trimming to control how duplicates are detected.
Working with large text files, data exports, or log outputs often results in repeated lines that clutter your content and make it harder to read or process. The Duplicate Lines Remover scans your text line by line and keeps only the first occurrence of each unique line, discarding all subsequent duplicates while preserving the original order of your content.
The tool provides two important configuration options. Case-sensitive comparison means that "Hello" and "hello" are treated as different lines, while turning it off treats them as duplicates. The whitespace trimming option strips leading and trailing spaces before comparing, so lines that differ only by indentation or trailing spaces are recognized as duplicates.
This tool is especially useful for developers cleaning up log files, data analysts preparing datasets, writers reviewing lists of items, and anyone who needs to quickly deduplicate content without opening a spreadsheet or writing a script. The result summary tells you exactly how many duplicates were removed and how many unique lines remain.
All processing happens entirely in your browser — no data is uploaded or stored anywhere. Paste your text, configure your preferences, click the button, and copy the cleaned result. It is fast, private, and handles texts of any reasonable length.