Find & Delete Duplicate Lines
Remove duplicate lines from your text while preserving order.
Text
Formatter
Cleaner
Tool Info
This tool removes duplicate lines from text while preserving the first occurrence and the original order.
You can paste text, load a .txt file, or use the sample input to try it out quickly.
About This Tool
This tool removes duplicate lines from text while preserving the first occurrence and the original order.
All processing happens in your browser — no data is sent to any server.
Frequently Asked Questions (FAQ)
How does the tool decide which line to keep?
The tool preserves the first occurrence of each unique line and removes subsequent duplicates while maintaining the original order.
Can I upload a file?
Yes — click "Load from file" and choose a .txt file. The file contents will be loaded into the input textarea.
Is my data sent to a server?
No — all processing is done locally in your browser. No data is uploaded to any server.
Can I replace the input with the output?
Yes — use the "Replace Input" button shown next to the output to copy the results back into the input area for further editing.