Remove Duplicate Lines
Clean up any list or text by removing the repeated lines in one click, with options to ignore case, sort and remove empty lines.
Original: 0 · Unique: 0 · Duplicates: 0
What does removing duplicate lines mean?
Removing duplicate lines means going through a text line by line and dropping the ones that repeat, leaving a single copy of each. The result is a clean list with no repeated entries.
A remove duplicate lines tool automates that work: instead of hunting for repeats by hand, you paste the text and instantly get the deduplicated version.
The whole operation happens in your browser, with nothing sent to a server. It is the fastest way to clean up any list or text document.
Why remove repeated lines?
Removing duplicate lines is useful whenever you work with lists or data. These are the most frequent use cases.
Clean up lists
Removing duplicate lines leaves a list of emails, keywords or names with no repeats, ready to use.
Deduplicate data
Exporting data from a spreadsheet or database often introduces repeated rows. Removing the duplicate lines cleans them up instantly.
Prepare content
Before publishing a list or an index, removing the repeated lines avoids duplicate entries and improves content quality.
To count the remaining lines, use the line counter, or read our blog post length guide.
How to remove duplicate lines step by step
Paste the text
Copy your list or text with repeated lines and paste it into the top box, one item per line.
Choose the options
Decide whether to ignore case, trim whitespace, remove empty lines and how to sort the result.
Copy the result
The list without duplicate lines appears instantly. Copy it or download it as a .txt file.
The options explained
Ignore case
With this option on, "Madrid" and "madrid" count as the same line and only one is kept. It is useful when a list mixes uppercase and lowercase inconsistently.
Trim whitespace
Trims the spaces at the start and end of each line before comparing. That way two equal lines with different extra spaces are recognized as duplicates.
Sort and remove empty lines
You can sort the result from A to Z or the other way around, and remove empty lines in one go. Combined, these options leave the list ready to publish or import.
Remove duplicates vs. show only the duplicates
The "Remove duplicates" mode returns the clean list: each line appears once, keeping the first occurrence. It is the usual mode for removing duplicate lines.
The "Show duplicates only" mode does the opposite: it shows only the lines that were repeated. It is useful for auditing a list and discovering which entries were duplicated, before combining it with the repeated words finder.