Dedupe Lines
Free online line deduplication tool. Remove duplicate lines and sort text instantly. Perfect for cleaning up lists and data. All processing is local and private.
How to Use Dedupe Lines
Paste Your Text
Paste the text with duplicate lines into the input panel. Each line is treated as a separate entry.
Choose an Action
Click "Remove Duplicates" to eliminate duplicate lines while preserving the order of first occurrence. Click "Sort Lines" to alphabetically sort all lines.
Copy the Result
The deduplicated or sorted text appears in the output panel. The status message shows how many duplicates were removed.
Example
Before (With Duplicates)
apple
banana
apple
cherry
banana
dateAfter (Deduplicated)
apple
banana
cherry
dateFrequently Asked Questions
What is line deduplication?
Line deduplication removes duplicate lines from text while preserving the first occurrence of each line. This is useful for cleaning up lists, removing duplicate entries from data files, and consolidating multiple sources of information.
Does the order of lines matter?
When removing duplicates, this tool preserves the order of first occurrence. The first time a line appears, it is kept; subsequent occurrences are removed. If you need lines sorted alphabetically instead, use the "Sort Lines" button.
Is the comparison case-sensitive?
Yes, the comparison is case-sensitive. "Hello" and "hello" are treated as different lines. If you need case-insensitive deduplication, convert all text to lowercase first using the Text Case tool.
When would I use this tool?
Common use cases include: cleaning up email lists, removing duplicate entries from CSV data, consolidating multiple search results, cleaning up log files, and deduplicating any list where each item is on its own line.
Common Use Cases
Line deduplication is a simple but powerful operation that saves time when working with lists and data files.
Typical Scenarios
- Cleaning up email lists by removing duplicate addresses
- Consolidating multiple search results into a unique list
- Removing duplicate entries from CSV or TSV files
- Cleaning log files by removing repeated error messages
- Creating unique word lists from text analysis