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Remove Duplicate Lines
Keep the first occurrence of each line, preserving order.
Your results will appear here.
Three steps. That’s it.
A useful toolkit for text, data, images and calculations.
- 01
Add your input
Choose a tool, enter values or select a file.
- 02
Make it yours
Adjust the options and run the action.
- 03
Take the result
Copy the result or download its file.
Text deduplicator online
Keep one copy of each item before sending a list downstream. The first occurrence determines output order; trimming and case options determine equality.
How to use it
Enter the source input or select Try example. Review Trim spaces, Ignore case. Select Run tool and inspect the result before copying or downloading.
Options and example settings
Worked examples
Keep one copy of each item before sending a list downstream.
Worked example — Remove Duplicate Lines
Settings: Trim spaces: On; Ignore case: Off
Input:
apple banana apple
Output:
apple banana
The example output has 2 lines. Compare its order, separators and whitespace with the input before copying the result.
Choose the right tool
This tool retains the first copy of each line. A value repeated three times still appears once. To discard all values that repeat, use Extract Lines That Occur Only Once; to inspect counts and positions, use Duplicate Line Finder.
Limitations and common mistakes
- The first occurrence determines output order; trimming and case options determine equality.
Frequently asked questions
How can I delete duplicate lines online?
Enter the source input or select Try example. Review Trim spaces, Ignore case. Select Run tool and inspect the result before copying or downloading.
Where is my input processed?
The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.
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