Original list
0 lines
Not saved
Duplicate Line Remover
Remove repeated entries from a one-item-per-line list and choose exactly how matches are compared and retained.
How to use
These are example steps; replace the values for your task.
- Ignore outer spaces and keep the first occurrence.
- Use the whitespace cleaner afterward if you also want to remove the spaces.
Result
0 lines
About this tool
By default, surrounding spaces are ignored, blank lines are removed, and the first occurrence stays in its original position. Case remains significant unless you choose to ignore it. These comparison options do not rewrite the retained line. Your text is processed only in your browser and is never sent to a server.
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Try a use case and check the result
Remove repeated rows from a one-item-per-line list.
Try this example replaces the input and settings. Restore previous input returns to the state before the latest example. Normal draft-saving rules apply.
After trying multiple examples, repeat Restore previous input to return to your original input. History is kept only in this page; restore any input you need before closing it.
Ignore outer spaces but preserve original text
Input and settings
apple apple pear
Ignore outer spaces: On; Ignore case: Off; Remove blank lines: On; Keep last occurrence: Off; Order: Original order
Expected result
Two lines: the first “ apple ” and “pear”. The first line retains its outer spaces.
How to read the result
Matching keys are separate from the retained original rows. Ignoring spaces does not trim the output.
Scope and pitfalls
This does not deduplicate by a selected CSV column. Check whether case should matter.
Continue with the next task
Frequently asked questions
What is this tool used for?
It removes repeated entries from one-item-per-line lists such as email addresses, product names, URLs, and keywords.
Does it change the original order?
The original order is preserved by default. You may also sort the result in ascending or descending order.
Is my list sent to a server?
No. Duplicate detection and draft storage take place only in your current browser.
A matching line is not proof of a matching person or product
This tool removes lines using string comparison. It cannot decide whether two people or products with the same name are identical. Ignoring surrounding spaces changes the comparison key, not the text of the retained line. Compare the original list and removed count before using the output.
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Inputs and storage
Keep a separate copy before clearing or resetting. This browser autosaves entered text. Data is not restored when read 30 days or more after its last save. Clearing site data or storage restrictions may remove it sooner.
Favorites and language preferences are stored separately and may be lost when site data is cleared. Tool resets and site-data deletion do not delete files already downloaded to your device.