What is Remove Duplicate Lines?
Remove Duplicate Lines is a text processing tool that finds and removes duplicate lines from your text. It is useful for cleaning up lists, deduplicating data, email lists, or any text where you need unique entries. The tool also includes sorting options and can extract only unique lines while preserving the original order.
How to Use
- Paste your text in the input area (one item per line).
- Configure options: case sensitivity, whitespace trimming, sorting, empty line removal.
- Click Remove Duplicates to process.
- View the statistics showing how many duplicates were found.
- Copy the cleaned output using the copy button.
Features
- Case-sensitive or insensitive deduplication
- Whitespace trimming before comparison
- Sort alphabetically, reverse, numerically, or randomly
- Remove empty lines option
- Extract unique lines (preserving first occurrence)
- Statistics showing original, unique, and removed counts
- Swap input/output for chaining operations
- 100% client-side processing
FAQ
What does "case sensitive" mean?
When case sensitive is enabled, "Hello" and "hello" are treated as different lines. When disabled (default), they are considered duplicates and only the first occurrence is kept.
What does "trim whitespace" do?
When enabled, leading and trailing whitespace is removed from each line before comparison. This means " hello " and "hello" would be considered duplicates.
What is the difference between "Remove Duplicates" and "Extract Unique"?
Both remove duplicates, but "Extract Unique" specifically preserves the first occurrence of each line in its original order, while "Remove Duplicates" may apply sorting if that option is checked.
How does numeric sorting work?
Numeric sorting attempts to parse each line as a number and sort accordingly. Lines that are not valid numbers are placed at the end. This is useful for sorting lists of prices, IDs, or other numeric data.