Remove Duplicate Lines
Clean a list by removing repeated lines, empty lines and extra spaces.
How to use: Paste your list, choose your options and copy the cleaned result.
How to use the Remove Duplicate Lines
Lists collected from spreadsheets, email exports, keyword research or log files often contain repeats. This tool strips them out in one step while keeping the first occurrence of every line.
Paste your list with one item per line. The cleaned version appears on the right straight away, along with a note saying how many lines were removed. Use the options to match the way your data is messy: trimming spaces catches entries that differ only by a trailing space, ignoring case treats “Apple” and “apple” as the same item, and removing empty lines tidies gaps.
You can also sort the result alphabetically in either direction. Sorting uses locale-aware comparison, so accented characters are placed sensibly. Keep the original order if the sequence matters, such as a ranked list.
Typical uses include cleaning mailing lists before an import, preparing keyword lists, merging two lists of names, and removing repeated entries from lists of URLs. Because the processing happens on your device, even sensitive lists stay private. If you need to know what changed rather than just the result, copy the original and cleaned versions into the text diff checker.
Frequently asked questions
Which duplicate is kept?
The first occurrence of each line is kept and later repeats are removed.
Does it handle large lists?
Yes. Tens of thousands of lines work smoothly in a modern browser.
Can I ignore capital letters?
Yes. Tick “Ignore case when comparing” so “Apple” and “apple” count as duplicates.