Remove Duplicate Lines
Remove duplicate lines from any text, keeping only unique entries.
How to Use Remove Duplicate Lines
- 1Paste your text into the input area.
- 2Choose whether to use case-sensitive comparison and whether to trim whitespace.
- 3Click 'Remove Duplicates' to filter the text.
- 4Copy the cleaned result.
Frequently Asked Questions
What counts as a duplicate?
Any line that has appeared earlier in the text. Only the first occurrence is kept. The order of unique lines is preserved.
Does 'Trim whitespace' affect the output?
Yes — with trimming enabled, lines that differ only in leading or trailing spaces are treated as the same line. The output uses the trimmed version.
Can I use this on a list of email addresses or URLs?
Absolutely. Paste one entry per line and the tool keeps only the first occurrence of each.
About Remove Duplicate Lines
Duplicate lines creep into text files, exported lists, and logs constantly. Our Remove Duplicate Lines tool cleans them out in one click — paste your text, hit the button, and get a deduplicated list back instantly.
The comparison is done line by line. Case-sensitive mode distinguishes 'Apple' from 'apple'; case-insensitive mode treats them as duplicates. Whitespace trimming ignores leading and trailing spaces when comparing, while still outputting clean lines.