Remove Duplicate Lines
Remove duplicate lines from your text while preserving the original order. Supports case-sensitive and case-insensitive comparison, with optional whitespace trimming.
Options
Statistics
How to Use
- Paste your text with multiple lines into the input area
- Configure options: enable/disable case sensitivity and whitespace trimming
- View the unique lines in the output area automatically
- Check the statistics to see how many duplicates were removed
- Click the Copy button to copy the result to your clipboard
Frequently Asked Questions
What is Remove Duplicate Lines?
Remove Duplicate Lines is a text processing tool that identifies and removes repeated lines from your text, keeping only the first occurrence of each unique line. This is useful for cleaning up data, removing redundant entries from lists, and processing log files.
What does case-sensitive mode do?
When case-sensitive mode is enabled (default), "Hello" and "hello" are treated as different lines. When disabled, they are considered duplicates and only the first occurrence is kept.
What does trim whitespace do?
When trim whitespace is enabled, leading and trailing spaces are ignored when comparing lines. So " hello " and "hello" would be considered duplicates. The original formatting of the first occurrence is preserved in the output.
Is this tool free to use?
Yes! All tools on ToolsKeeper are completely free to use with no limitations or sign-up required.
Is my data secure?
Absolutely. All processing happens directly in your browser. Your data never leaves your device or gets sent to any server.