Text Tools
Remove Duplicate Lines
Strip duplicate lines from any list or text with optional case-insensitive comparison, whitespace trimming, and sorting.
Processing happens in your browser — customer lists and private data never leave your device.
Case, Whitespace and Order Decide the Result
Two lines that differ only in capitalization or a trailing space are usually the same entry — enable case-insensitive comparison and whitespace trimming before concluding that a list is genuinely full of near-duplicates. Deduplication keeps the first occurrence by default, so if order matters (chronological logs, ranked lists), check whether the earliest or latest instance of each value is the one you want to keep before running the tool.
How the Transformation Works
- Paste your list — one entry per line — into the input box.
- Choose whether comparison should ignore letter case and surrounding whitespace.
- Optionally sort the result alphabetically before copying or downloading it.
- Copy the deduplicated list or download it as a .txt file.
Example Input & Output
Common Questions
Does the order of my list change?
No, unless you explicitly enable sorting. Deduplication keeps the first occurrence of every line in its original position.
Is my list uploaded to a server?
No. The processing happens entirely in your browser, which matters for customer lists and other sensitive data.
Related Text Tools
Line Sorter
Sort any list of lines alphabetically, numerically, by length, in reverse, or shuffled randomly — with optional deduplication.
Text Case Converter
Convert any text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case in one click.
Whitespace Remover & Text Cleaner
Clean pasted text in one pass: collapse multiple spaces, remove tabs, strip blank lines, join broken lines, and trim edges.