Remove Duplicate Lines
Keep only unique lines from a list, in the original order.
Tool inputs stay in your browser · optional AI search sends your query
How to use it (step by step)
- 1Type or paste your text into the “Input” box. There is already an example in it so you can see how it works; press Clear to start with your own.
- 2Choose your settings: “Ignore upper/lower case”.
- 3The answer appears right away in the “Result” box. No button needed.
- 4Press Copy and paste the result wherever you need it.
Words to know
- Duplicate
- An item that appears more than once. Removing duplicates keeps only one copy of each.
- Array / list
- An ordered collection of items, like ["apple", "banana"]. Every programming language has one.
- Case (UPPERCASE, lowercase…)
- How letters are written: UPPERCASE (all big), lowercase (all small), Title Case (Big First Letters). camelCase and snake_case are styles programmers use for names.
More in Text & Writing
Remove Extra SpacesCollapse double spaces, trim lines and remove empty lines.Remove Line BreaksJoin lines into one paragraph, e.g. text copied from a PDF.Sort LinesSort a list A–Z, Z–A, by length, by number, or shuffle it.Reverse TextReverse letters, word order or line order.Find & ReplaceReplace every match in a text, with optional regex and case matching.Text Compare (Diff)Compare two texts and highlight what was added or removed.