Duplicate Lines Remover
Strip duplicate lines from a word list, CSV column or any text - keep first occurrences, drop blanks, and optionally sort the result.
Updated September 2026 · Written and verified by Akash Pandey
Duplicate Lines Remover
How to use the duplicate lines remover
- Paste your text into the input box, one line per entry.
- Choose whether to ignore blank lines, trim whitespace, and sort the output.
- Click Remove duplicates and copy the cleaned list.
Frequently asked questions
How are duplicates decided?
Lines are compared after any trimming you enable, case-insensitively by default. The first occurrence of each line is kept.
Can I keep the order of first appearance?
Yes - if you leave sorting off, the output preserves the order lines first appeared in your input.
Are blank lines removed?
Only if you enable "Ignore blank lines". When on, empty lines never count as duplicates or appear in the output.
Does it work on very large lists?
Yes - the tool uses a hash set, so even hundreds of thousands of lines deduplicate in well under a second.
Will it change my data?
It only removes duplicate lines and applies the options you chose. Your original text is untouched until you copy from the output.
Can I sort the deduplicated lines alphabetically?
Yes. You can enable the sorting option to arrange your unique lines in alphabetical order (A-Z).
Does this tool remove empty or whitespace-only lines?
Yes. You can toggle whether to strip blank lines or preserve them in the output.
Is the comparison case-sensitive?
By default, duplicate detection can be configured to be case-sensitive or case-insensitive depending on your needs.