What does the Remove Duplicate Lines tool do?
This tool scans your text line by line and removes any duplicates, leaving only one instance of each unique line. It is ideal for cleaning lists where each item appears on its own line, such as email lists, tags, usernames, product SKUs, or keywords.
Instead of manually checking and deleting repeated lines, you can paste your text into the tool, click a button, and instantly get a clean, unique list.
How it works
When you click “Remove duplicates”, the tool will:
- Split your text into lines.
- Optionally trim spaces at the start and end of each line.
- Ignore empty lines if that option is enabled.
- Compare lines using either case-sensitive or case-insensitive matching.
- Keep only the first occurrence of each unique line.
- Optionally sort the remaining lines alphabetically (A–Z).
The summary on the right shows how many original lines you had, how many unique lines remain, and how many duplicates were removed.
When to use this tool
The Remove Duplicate Lines tool is useful in many everyday scenarios:
- Cleaning email lists before importing them into a newsletter or CRM.
- Cleaning keyword lists for SEO, ads, or marketplace listings.
- Removing duplicate tags or labels from exported CSV-style lists.
- Normalizing data when preparing text for scripts, spreadsheets, or databases.
Tips for best results
- Enable “Trim whitespace” if some lines have accidental spaces at the start or end. This helps treat visually identical lines as true duplicates.
- Use case-insensitive mode (default) when capitalization does not matter, such as email addresses or tags.
- Ignore empty lines if you want a compact list with no blank rows.
- Try the “Sort alphabetically” mode when you want a neatly sorted list after duplicates are removed.
Use this tool whenever you need to quickly tidy up line-based text, keep only the unique entries, and avoid manual, error-prone cleanup work.