Remove Duplicate Lines
Clean a list by removing repeated lines, with options to ignore case, trim spaces, drop blanks and sort alphabetically.
Your list never leaves your browser. Deduplication happens on your device — nothing is uploaded.
How it works
Paste your list, one item per line
Choose matching and sort options
Copy the de-duplicated result
About this tool
When you merge lists — email addresses, keywords, URLs, product SKUs — duplicates creep in. This tool removes repeated lines in one pass and tells you exactly how many it deleted. You can match case-sensitively or not, trim whitespace so “ apple” and “apple” count as one, drop empty lines, and optionally sort the unique results alphabetically. It keeps the first occurrence of each line so the original order is preserved unless you choose to sort. Because everything runs locally in your browser, it handles large lists instantly and keeps sensitive data private. Combine it with remove line breaks to tidy messy pasted data before deduplicating.
Frequently asked questions
Paste your list with one item per line. The tool keeps the first occurrence of each line and removes every later repeat, showing how many duplicates it stripped out.
Yes. Enable 'Ignore case when matching' so that 'Apple' and 'apple' are treated as the same line.
By default it preserves the order of first appearance. You can also sort the result A → Z or Z → A if you prefer an alphabetised list.
If you enable 'Drop empty lines', all blank lines are removed. Otherwise a single blank line is kept like any other unique value.
No. Deduplication runs entirely in your browser, so your data stays on your device — safe for emails, keywords or any private list.