Remove Duplicate Lines
Paste your list and get back a clean, de-duplicated version — the first occurrence of every line is kept, the rest are dropped.
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How the duplicate remover works
It scans your list top to bottom and keeps only the first time each line appears — everything else is a duplicate and gets removed.
Paste your lines
Drop in a list of emails, URLs, keywords, names — anything with one item per line.
Pick your options
Match case-insensitively, ignore stray spaces with trim, and optionally strip out blank lines.
Copy or download
Grab the clean result with Copy, or save it as a .txt file — nothing is ever uploaded.
What each option does
Keep first occurrence: lines are de-duplicated in order, so the earliest appearance of any line is preserved and later repeats are dropped. The relative order of the lines you keep never changes.
Case-insensitive makes "Hello" and "hello" count as the same line, keeping whichever came first. Trim whitespace compares lines after stripping leading and trailing spaces or tabs, so accidental indentation doesn't create false uniques. Remove blank lines additionally drops empty and whitespace-only lines from the output entirely.
It's ideal for cleaning up mailing lists, CSV columns, log files, keyword research and any pasted data where the same value crept in more than once.
Private by design. Your text never leaves your device. All processing happens right here in your browser — nothing is uploaded or stored.