Duplicate Line Remover
Remove duplicate lines from text with smart options.
How to use
- Paste the text to deduplicate into the input box, one entry per line.
- Tick options as needed: ignore case, trim spaces, remove empty lines; the first occurrence's order is kept by default — uncheck "Keep original order" to sort alphabetically.
- Pick the output separator (newline or comma) and press "Remove duplicates".
- The stats show raw lines, unique lines and lines removed; copy the result from the output box in one click, or press "Clear" to reset everything.
- All processing runs locally in your browser — logs, lists and other sensitive text never leave your device.
FAQ
Which duplicate is kept?
In keep-order mode, only the first occurrence of each line survives and later duplicates are dropped; in sort mode the unique lines are deduplicated first and then sorted alphabetically, so no unique line is ever lost.
How does "Ignore case" compare lines?
When enabled, each line is lowercased for comparison, so "Apple" and "apple" count as the same line. The output keeps the original casing of the first occurrence — nothing is rewritten.
How are blank and whitespace-only lines handled?
With "Remove empty lines" checked, empty lines and lines containing only whitespace are dropped. If unchecked, blank lines participate in deduplication like any other line, so consecutive blanks collapse into one.
When is comma-separated output useful?
It is handy for pasting results straight into a spreadsheet, a SQL IN list or a single-line config. Note that if the lines themselves contain commas, you may need to quote or escape them afterwards.