Duplicate Line Remover
Delete duplicate lines from any list or dataset — with trim, case-insensitive and sort options.
Processed on your device — nothing is uploaded
🔒 Deduplicated locally — your list never leaves the browser.
About the Duplicate Line Remover
Clean up keyword lists, log files, email lists, CSV columns and code in one click. The tool keeps the first occurrence of every line, preserves the original order (unless you choose to sort), and reports exactly how many duplicates were removed.
Options include trimming stray whitespace, ignoring letter case when comparing, and alphabetizing the result. Everything runs locally — your data never leaves your browser.
How to use the Duplicate Line Remover
- 1Paste your lines into the input box.
- 2Toggle trim, case-insensitive matching or sorting as needed.
- 3Press Remove Duplicates and copy the clean result.
Frequently asked questions
Which duplicate is kept?
The first occurrence. Everything after it is removed, so the original order is preserved unless you enable sorting.
Does case matter?
By default yes — “Apple” and “apple” are different lines. Turn on case-insensitive matching to treat them as duplicates.
Is my text uploaded?
No. The deduplication happens entirely in your browser.
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