Remove Duplicate Lines Online — Free Text Deduplication Tool

Trim whitespace from each line Case-insensitive comparison Remove empty lines Sort alphabetically Reverse order

Input Lines 0

Output Lines 0

Removed 0

About This Tool

The remove duplicate lines tool quickly eliminates repeated entries from any list or text block. Options include case-insensitive matching, trimming whitespace, removing blank lines, and sorting alphabetically. Ideal for cleaning keyword lists, email lists, CSV data, and log files.

Common Use Cases

Deduplicating keyword lists for SEO
Cleaning up email subscriber lists
Removing duplicate entries from CSV exports
Filtering unique lines from log files
Normalizing database text field values

Frequently Asked Questions

Does this tool work case-insensitively?

Yes. Enable the ignore case option to treat Apple and apple as duplicates.

Can I sort the output alphabetically?

Yes. The Sort output option arranges unique lines in ascending alphabetical order after deduplication.

What is the maximum text size?

There is no hard limit. The tool processes text in your browser. Most modern devices handle millions of characters without issues.