Remove duplicate lines from any text instantly to clean up lists, logs, and data. Choose case-sensitive or case-insensitive matching, optionally sort results alphabetically, and see exactly how many duplicates were removed.
How to Use Remove Duplicate Lines
- 1Paste your text into the input box
- 2Choose case-sensitive or case-insensitive matching for finding duplicates
- 3Optionally enable "Sort results" to alphabetize the output
- 4Click "Remove Duplicates" to process — the removed count is shown instantly
- 5Copy the deduplicated text from the output box
Features
- Removes exact duplicate lines with case-sensitive and case-insensitive matching modes
- Optional alphabetical sorting preserves original line order when off
- Shows exact count of removed duplicates for full transparency
- Handles large text files with thousands of lines — all processing is browser-local
Frequently Asked Questions
Does this tool consider whitespace when finding duplicates?
By default, leading and trailing whitespace is trimmed before comparison. You can disable this in settings to preserve exact whitespace.
What is the maximum text size it can handle?
The tool can handle tens of thousands of lines without performance issues since all processing is done in the browser with JavaScript.
Can it remove near-duplicate lines (fuzzy matching)?
No, this tool uses exact matching. For fuzzy duplicate detection, you would need a more advanced tool.
Can I also remove empty lines?
Yes. For that, use the Remove Empty Lines tool, or combine with the Text Line Sorter for full text cleanup.