Remove Duplicate Lines
Deduplicate lines in any list, keeping the first occurrence, with optional case-insensitive and trimmed matching. Free, private and online.
About this tool
Keep Each Line Once
Clean email lists, keyword lists or log output: repeated lines are removed while the original order of first occurrences stays the same.
How to use it
- Paste one item per line.
- Choose case-insensitive or trimmed matching if needed.
- Copy the deduplicated list.
Frequently asked questions
Is the order of lines changed?
No. The first occurrence of each line stays where it was; later repeats are removed.
Is my text uploaded anywhere?
No. The tool runs in your browser and the text never leaves your device, so you can paste confidential drafts, contracts or customer data.