The Remove Duplicate Lines tool on Text Mini Tools helps you quickly clean lists, CSV snippets, email dumps, and copied text by removing repeated lines. Duplicate lines commonly appear when combining multiple sources, exporting data, or copying content from forums and spreadsheets. Manually scanning and deleting duplicates is tedious — this utility automates that task so you can focus on the actual work.
This lightweight tool runs fully in your browser using JavaScript. That means your text never leaves your device, ensuring privacy and instant performance. The tool preserves formatting while removing duplicates, and offers the option to remove duplicates while preserving the first occurrence or to remove duplicates and return a sorted unique list.
Writers, developers, students, SEO professionals, and data analysts use this tool to prepare clean lists for imports, remove repeated entries from keyword clusters, tidy up forum dumps, and clean configuration snippets. The combination of a simple UI, client-side processing, and one-click copy/download makes this a fast and reliable helper for everyday text-cleaning tasks.
It removes duplicate or repeated lines from text, preserving the first occurrence by default.
No — all processing happens in your browser and your data is not sent to any server.
By default, the tool is case-insensitive (ignores casing). You can enable case-sensitivity if needed.
Yes — use the Download button to save as a .txt file or Copy to clipboard.
Yes — Text Mini Tools provides this utility free with no registration required.
Yes — Remove Duplicates preserves the first occurrence order. Use Remove & Sort to receive a sorted unique list.
Yes — the interface is responsive and works on phones and tablets.