Remove Duplicate Lines Tool
Paste any list or text and instantly remove all duplicate lines. Options to ignore case, trim whitespace, sort result, and remove blank lines. Download as .txt.
How to use
- Paste your text or list into the input area.
- Configure options: case sensitivity, trimming, sorting.
- Unique lines appear instantly in the result area.
- Copy or download the cleaned result.
Related tools:
Data cleanup is most of the work in many practical data tasks. When you get a list from a spreadsheet export, a copy-paste from multiple sources, or a log file, duplicates creep in. Deleting them by hand is tedious above a dozen items. This tool takes the entire block of text, removes repeated lines, and gives you back the unique set.
Options matter: sometimes Remove duplicate lines should be case-insensitive (Email and email are the same). Sometimes you want the result sorted. Sometimes whitespace differences should be ignored (a line with a trailing space and the same line without are probably the same). The tool lets you control all of these.
Frequently Asked Questions
What counts as a duplicate line?
By default, an exact match including spaces and capitalisation. With case-insensitive mode enabled, 'Apple' and 'apple' are treated as duplicates. With whitespace trimming, ' hello ' and 'hello' are treated as duplicates.
Does it preserve the original order?
Yes, by default. The first occurrence of each line is kept; subsequent duplicates are removed. If you enable sorting, the result is sorted alphabetically instead.
What is the maximum amount of text I can process?
Browser-based tools like this handle thousands of lines comfortably. For very large files (millions of lines), a command-line tool like Unix sort -u would be faster.