Remove Duplicate Lines
Remove duplicates with case/trim/sort options.
How to use
Runs entirely in your browser. Live updates or click to run. No signup, no tracking, no data sent anywhere.
Part of 71 free tools by Auburn AI. Category: Text Tools
About this tool
Remove Duplicate Lines is a straightforward text utility that scans your input line by line and strips out any repeated entries, keeping only the first occurrence of each. It is useful for developers cleaning up log files, writers tidying word lists, data analysts deduplicating exported records, and anyone dealing with pasted content that contains unwanted repetition.
Reach for this tool when you have a list, dataset, or block of text where repeated lines are cluttering your output or causing errors downstream. It saves the tedious work of manually scanning hundreds of lines and is especially handy before importing data into a spreadsheet or database.
How to use it
- Paste or type your text into the input box on the tool page.
- Choose whether the comparison should be case-sensitive or case-insensitive.
- Decide if blank lines should be removed along with duplicates.
- Click the Remove Duplicates button to process your text.
- Review the output, which retains only the first occurrence of each line.
- Copy the cleaned result or download it as a plain text file.
Pro tips
- Sort your lines alphabetically before deduplicating so that near-identical entries with different spacing become easier to spot and clean manually.
- Run a character frequency check afterward to catch hidden duplicates caused by invisible whitespace or different line-ending characters.