Duplicate Line Remover
Deduplicate text lists, sort alphabetically, remove empty lines, and trim whitespace.
How to Use Duplicate Line Remover
Paste your list into the text area.
Select your options: Case Sensitive matching, Remove Empty Lines, Sort Alphabetically, or Trim Whitespace.
Click "Clean & Deduplicate" to process the list instantly.
View deduplication stats and copy your cleaned list.
About Duplicate Line Remover
Clean and organize large text lists, email lists, and keyword sets. Automatically strip duplicate lines, remove blank whitespace lines, sort alphabetically (A-Z or Z-A), and toggle case-sensitive or insensitive matching.
Frequently Asked Questions
Can this handle large lists with tens of thousands of lines?
Yes. Using JavaScript Set data structures, deduplication of 100,000+ lines executes in milliseconds on your device.
Does it keep the original order?
Yes. Duplicates are removed while the first appearance of every line keeps its place. Optional sorting is available if you want it.
Can it ignore extra spaces when comparing lines?
Yes. Trimming whitespace before comparing is built in, so "apple " and "apple" count as the same line.
Further Reading
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