Remove Duplicate Lines
Input
Output
Free Online Duplicate Line Remover
Quickly remove duplicate lines from any block of text. Supports case-insensitive matching, whitespace trimming, empty line removal, and preserves original line order by default.
How to Use
Paste your text into the input field, choose your options, and click Remove Duplicates. Only the first occurrence of each unique line is kept.
Options Explained
- Case insensitive — Treats "Hello" and "hello" as the same line.
- Trim whitespace — Removes leading and trailing spaces before comparing lines.
- Remove empty lines — Strips all blank lines from the output.
- Preserve original order — Keeps lines in their original order. When unchecked, lines are sorted alphabetically.
Common Use Cases
- Cleaning up email lists or CSV data
- Removing duplicate entries from log files
- Deduplicating lists of URLs, keywords, or IDs
- Cleaning up text data before importing into a database