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About Remove Duplicate Lines
The Remove Duplicate Lines tool is a clean, client-side utility designed to organize and de-duplicate lists of data. When dealing with database exports, email lists, keywords, or inventory codes, duplicates can cause errors and waste space. Our tool strips duplicate lines instantly, sorts lists alphabetically if desired, and trims spaces, processing everything locally to protect your data.
How it Works
Paste your list into the "Raw Input List" box. Select your cleaning options (Trim Whitespace, Ignore Blank Lines, Sort Alphabetically). Click "Remove Duplicates", and our script splits the text by newlines, cleans the lines, filters duplicates using a JavaScript Set, and displays the organized list in the output box, ready to copy.
Key Features
- Duplicate Removal: Instantly strips duplicate lines from text.
- Flexible Sorting: Optional alphabetical sorting.
- Whitespace Controls: Trim leading/trailing spaces and skip blank lines.
- Secure & Offline: All processing is done locally in your browser.
Technical Details
The line cleaner splits the input string by newlines (\n). If selected, it maps string.prototype.trim() to clean lines and filters out empty lines. It passes the array to a new Set() object to remove duplicates, optionally runs array.prototype.sort() for alphabetical sorting, and joins the elements back with newlines.