Text tools
Remove Duplicate Lines Online - Clean Lists in Browser
Paste a list or text block, remove duplicate lines in your browser, and copy a clean result.
- No signup
- Browser-local
- Clean output
- Sample included
Privacy note
Your text is processed in your browser. This tool does not store pasted text on a server.
- Original lines
- 0
- Unique lines
- 0
- Duplicates removed
- 0
What this removes
This tool compares lines in pasted text and removes repeated entries. It is useful for cleaning keyword lists, email lists, exported rows, copied table columns, tags, product names, log fragments, and plain text files without opening a spreadsheet.
The default behavior keeps the first version of each line so the cleaned list stays close to the original order. Optional settings help you decide whether whitespace, capitalization, or sorting should affect the final result.
Options
Keep original order
Useful for pasted lists, exported rows, log snippets, and keyword lists where the first occurrence should remain in its original position.
Trim whitespace
Treats lines with accidental spaces before or after the text as the same value, which catches common copy-and-paste duplicates.
Case sensitive matching
Keep this on when Example and example should remain separate. Turn it off when capitalization should not matter.
Sort output
Use sorting when you need a clean alphabetical list for review, matching, documentation, or simple comparison work.
How to clean a list
- Paste the list or multi-line text into the input box.
- Enable trimming when copied lines may contain accidental leading or trailing spaces.
- Turn off case-sensitive matching when capitalization should not create separate results.
- Turn on sorting only when alphabetical output is more useful than preserving original order.
- Review the cleaned result, then copy it for your next workflow.
Privacy and limitations
The current version runs the duplicate check in your browser and does not require an account, file upload, or server-side processing for normal use.
Duplicate detection is line-based. It will not understand semantic duplicates such as abbreviations, translated terms, misspellings, or two lines that mean the same thing but are written differently.
Frequently asked questions
Does the tool keep the first duplicate or the last duplicate?
By default, it keeps the first occurrence and removes later matching lines. This helps preserve the order of the original pasted list.
Can it ignore uppercase and lowercase differences?
Yes. Turn off Case sensitive when lines such as Apple and apple should be treated as the same value.
Will blank lines be removed?
The cleanup is focused on duplicate lines. Review the output when blank lines have meaning in your source text or when empty rows came from an export.
Is my list uploaded anywhere?
No. The current version processes text in your browser. Do not paste private or regulated data unless your own policies allow browser-based tools.
Last updated: May 7, 2026
See the tool in action
How this page is maintained
This tool page is maintained for practical accuracy, clear limitations, browser-based processing behavior, and links to related cleanup tasks. It is intended for everyday text cleanup, not for legal, medical, financial, security, or other high-stakes decisions.
Browser-local processing
The current tool runs in the browser and does not require an account, upload, or server-side text processing for normal use.
Reviewed behavior
Examples, options, and limitations are checked against the actual tool behavior before public pages are added to the site.
Human review still matters
Text cleanup can miss source-specific issues such as broken words, malformed data, or copied table artifacts, so review important output before reuse.
Safe use checklist
- Use sample or non-sensitive text when testing a workflow.
- Check the output preview before copying it into another system.
- Keep confidential, regulated, or customer data inside approved tools.
- Use related tools only when they match the same cleanup task, not to force unrelated edits.
Related tools
Reverse lines
OpenReverse the order of pasted lines, with optional trimming and blank-line cleanup.
Remove empty lines
OpenRemove blank lines from pasted text, lists, and exported rows directly in your browser.
Sort lines alphabetically
OpenSort lines alphabetically, trim whitespace, remove blank rows, and copy a clean sorted list.