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Remove Duplicate Lines
Remove duplicate lines from text with multiple modes
By Craftisle Team
About Remove Duplicate Lines — Free Online Tool
Remove duplicate lines from text with multiple modes: remove all duplicates (keep first occurrence), remove only consecutive duplicates, or keep only unique lines. Also supports sorting, trimming, and empty line handling.
How to Use Remove Duplicate Lines — Step by Step
- Paste your text
Enter the text with duplicate lines in the input box.
- Choose mode
Select removal mode: all duplicates, consecutive only, or unique only.
- Configure options
Set newline handling, sorting, and trimming options.
- Remove duplicates
Click Remove Duplicates. Clean text appears in the output.
Use Cases for Remove Duplicate Lines
Data cleaning
Remove duplicate entries from CSV data, log files, or text lists.
List deduplication
Clean up email lists, URL lists, or keyword lists.
Log analysis
Remove repeated log entries to focus on unique events.
FAQ — Remove Duplicate Lines Free Online Tool
What is 'unique only' mode?
Unique only mode keeps only lines that appear exactly once. Lines that appear 2+ times are removed entirely.
Does trimming affect duplicate detection?
Yes. When 'Trim lines' is enabled, ' hello ' and 'hello' are treated as duplicates because both trim to 'hello'.