Remove Duplicate Lines
Deduplicate any list instantly.
About this tool
The Remove Duplicate Lines tool instantly deduplicates any list - keyword lists, email lists, CSV data, or log entries - keeping only unique lines. It saves the tedious manual work of sorting and removing repeats from large data sets.
How it works
- Paste your list (one item per line) into the input field.
- Click Remove Duplicates.
- The output shows only unique lines in their original order (or sorted alphabetically if selected).
- Copy the cleaned list for use in your project.
Example use cases
- Keyword list cleanup: Paste a 500-line keyword list exported from multiple tools to remove the 120 duplicates and get a clean unique list.
- Email list deduplication: Remove repeated email addresses from a compiled mailing list before importing into an email marketing tool.
Frequently asked questions
Does it preserve the original order of lines?
Yes - by default, the first occurrence of each line is kept and duplicates are removed, preserving order. Toggle the sort option to alphabetise instead.
Is there a line limit?
There is no enforced limit, but very large inputs (100,000+ lines) may cause a brief processing delay depending on your device.