🧹 Remove Duplicate Lines
Paste any text or list and instantly remove all repeated lines. Keep unique lines only, with optional case sensitivity and blank line removal.
About Remove Duplicate Lines
This tool scans your text line by line and removes any line that has already appeared earlier in the document. It is particularly useful for cleaning up exported data, email lists, keyword lists, log files and any other text where duplicate entries have accumulated over time.
All processing happens in your browser — your data is never uploaded to any server. There are no size limits and results are instant regardless of how many lines your text contains.
When to Use This Tool
- Cleaning up email lists or subscriber lists with duplicate entries
- Removing repeated keywords from an SEO keyword list
- Deduplicating exported database rows or CSV data
- Cleaning up log files with repeated error messages
- Removing duplicate URLs from a list of links
- Consolidating notes or lists that have grown with repetition
Available Options
- Case Sensitive — treats "Hello" and "hello" as different lines. Off by default
- Keep Order — preserves the original order of lines. Turn off to sort alphabetically
- Remove Blank Lines — also removes empty lines from the output
- Trim Whitespace — removes leading and trailing spaces before comparing lines
Frequently Asked Questions
What counts as a duplicate line?
+A duplicate line is any line that appears more than once. By default comparison is case-insensitive, so "Hello" and "hello" are treated as duplicates. Enable Case Sensitive to treat them as different lines.
Does the tool remove blank lines too?
+You can choose to remove blank lines using the Remove Blank Lines option. This is useful when cleaning lists that have empty rows between entries.
Is there a line limit?
+No. The tool handles any number of lines instantly since all processing runs in your browser. Even lists with tens of thousands of entries are processed in milliseconds.