Duplicate Line Remover
Paste a list and remove exact duplicate lines, optionally ignoring case.
About this tool
Long lists — email addresses, keywords, URLs, spreadsheet exports — often end up with accidental duplicate lines after merging or copy-pasting. This tool strips exact repeats while keeping the first occurrence of each line, so your list order stays intact.
How to use it
- Paste your list, one item per line, into the box.
- Choose whether duplicates should be matched exactly or case-insensitively.
- Click to remove duplicates and copy the cleaned list.
Tips
- Turn on case-insensitive matching if your list might have 'Email' and 'email' as separate entries that should count as duplicates.
- This only removes exact duplicate lines, not near-duplicates with extra whitespace — run the Whitespace Cleaner first if needed.
- The first occurrence of each line is always kept, preserving your original ordering.
FAQ
Does it remove blank lines too?
Blank lines are treated like any other line — if you have several, only the first empty line is kept unless you clean them separately.
Can I use this for CSV data?
It works line by line, so it's best for simple one-column lists rather than full CSV rows.