Remove Duplicate Lines
Clean up lists of emails, keywords, URLs or names by removing repeated lines. The first occurrence of each line is kept in its original order.
Free · No sign-up · Files stay on your device
How to use Remove Duplicate Lines
- 1Paste your list, one item per line.
- 2Choose your options, such as ignoring case or sorting.
- 3Copy or download the cleaned list.
Features
- Keeps the first occurrence in original order
- Optional case-insensitive matching
- Trim spaces and remove empty lines
- Optional A–Z sorting
- Shows how many duplicates were removed
Typical uses
Deduplicate email lists before a mailing, clean keyword lists for SEO, remove repeated URLs from a crawl export, or tidy up data before pasting it into a spreadsheet.
Frequently asked questions
Which copy of a duplicate is kept?
The first one. Later copies are removed and the remaining lines keep their original order unless you choose to sort.
Are "Apple" and "apple" duplicates?
Only if you tick "Ignore case". Otherwise they are treated as different lines.
How many lines can it handle?
Hundreds of thousands of lines are processed instantly in most browsers.
Related tools
Text Case ConverterConvert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case or kebab-case online for free. Paste, click, copy.Word CounterFree online word counter. Count words, characters, sentences and paragraphs as you type, and see reading time and speaking time instantly.Text Diff CheckerCompare two texts and highlight the differences line by line online for free. See added, removed and unchanged lines instantly. Nothing is uploaded.