Remove Duplicate Lines
Remove duplicate lines while keeping the first occurrence. Perfect for cleaning logs, lists, and text snippets—everything runs locally.
How it works
Frequently Asked Questions
How do I remove duplicate lines from my text?
Paste your text into the Input Text area and click 'Remove Duplicates' (or press Ctrl/Cmd + Enter). All repeated lines are stripped instantly, leaving only the unique lines.
Does this tool preserve the original order of lines?
Yes! The tool retains the first occurrence of each unique line and preserves its exact relative position, unlike simple sorting scripts that reorder your list.
How are spaces and letter cases treated during deduplication?
Lines are compared exactly as entered, meaning leading or trailing spaces and letter casing are taken into account. If you need to clean whitespace first, pair this tool with our 'Trim Lines' or 'Remove Extra Spaces' utilities.
Is there any limit to how many lines I can clean?
Because processing happens directly inside your web browser using local memory, there are no upload size restrictions or server limits. It comfortably handles tens of thousands of lines in milliseconds.
Is my text uploaded to a remote server?
No. Everything runs 100% client-side on your local device. Your sensitive data, logs, email lists, or documents never leave your browser.
