🧹 Remove Duplicate Lines
Paste your text and instantly remove repeated lines. Supports case-sensitive matching, whitespace trimming, and sorting.
How to Remove Duplicate Lines
This free tool removes repeated lines from any text instantly. All processing happens in your browser — no data is sent to any server.
Options Explained
- Case-sensitive — When enabled, "Hello" and "hello" are treated as different lines. Disable to ignore case differences.
- Trim whitespace — Removes leading and trailing spaces from each line before comparison. This catches lines that are identical except for extra spaces.
- Sort result — Alphabetically sorts the deduplicated output. Useful for creating clean, ordered lists.
- Keep first occurrence — When enabled, the first appearance of each unique line is preserved. When disabled, all occurrences of duplicated lines are removed entirely.
Common Use Cases
- Cleaning email lists — Remove duplicate email addresses from mailing lists
- Log file analysis — Deduplicate log entries to find unique events
- Data cleaning — Remove repeated records from CSV or text exports
- Code cleanup — Remove duplicate import statements or configuration lines
- SEO keyword lists — Deduplicate keyword research exports from multiple tools