How to use Remove Duplicate Lines
- Paste a list with one entry per line.
- Choose whether to trim whitespace, ignore letter case, or remove blank lines.
- Remove duplicates and copy or download the cleaned list.
A closer look
Clean a list of labels, IDs, or other entries while preserving first-occurrence order. By default, leading and trailing whitespace is trimmed before comparison and in the output. Case-insensitive matching treats Apple and apple as duplicates; case-sensitive matching keeps them separate. Empty lines are treated as an entry unless you choose to remove them.
A practical example
For a list containing apple, banana, apple on separate lines, the result keeps apple followed by banana. Enable Ignore letter case to treat Apple as the same entry.
A useful tip
Disable trimming if indentation or trailing spaces are meaningful. This is a line-based tool, so comma-separated values on one line are not treated as separate entries.
Good questions. Simple answers.
Is the list sorted?
No. The first occurrence of each distinct line stays in its original position.
Which duplicate is kept?
The first matching line is retained. With trimming enabled, that retained line is returned without surrounding whitespace.
Explore all text tools for related tasks and category-specific guidance, or read how Toolzafi handles your data.