Remove Duplicate Lines
Remove duplicate lines from your text instantly. Free online tool that filters out repeated lines and keeps only unique content.
Related Tools
Remove Duplicate Words
✂Remove duplicate words from your text while preserving order. Free online tool to eliminate repeated words and clean up content.
Sort Lines Alphabetically
✂Sort text lines alphabetically, numerically, or in reverse order. Free online line sorting tool with multiple sorting options.
Remove Line Breaks
✂Remove line breaks from text and merge into a single line. Free online tool that strips newlines and joins text into continuous paragraphs.
Remove Extra Whitespace
✂Remove extra whitespace, leading/trailing spaces, and blank lines from text. Free online tool for cleaning up messy text formatting.
The duplicate line remover scans your text line by line and removes any lines that have already appeared, keeping only the first occurrence of each unique line. This is essential for cleaning up lists, log files, data exports, and any text with repetitive content.
You can choose between case-sensitive mode (where "Hello" and "hello" are treated as different lines) or case-insensitive mode (where they are treated as duplicates). The tool preserves the original order of lines while removing only the redundant ones.
All processing happens directly in your browser — your data stays completely private and is never sent to any server.
How to Use Remove Duplicate Lines
- 1Paste or type your text with duplicate lines into the input area.
- 2Optionally enable case-insensitive mode to ignore capitalization differences.
- 3Duplicate lines are instantly removed, keeping only unique lines.
- 4Click the Copy button to copy the deduplicated text.