Home›Remove Duplicate Lines

Remove Duplicate Lines

Paste any list or text — duplicate lines are removed instantly, leaving only unique entries. Supports case-sensitive matching and blank line removal.

Input
0 lines
Result
0 unique lines

How to use Remove Duplicate Lines

Paste your list into the left panel — one item per line. Duplicate lines are removed instantly and the clean list appears on the right. Use the options above to control how duplicates are detected: case-sensitive mode treats "Apple" and "apple" as different, while trim whitespace ignores leading and trailing spaces when comparing lines.

Common use cases

Email lists — paste a list of email addresses and remove duplicates before importing into your CRM or email tool.

Keywords — clean up keyword lists for SEO or PPC campaigns by removing repeated entries.

Data cleaning — remove duplicate rows from exported CSV data or database query results.

Code — deduplicate arrays, import lists, or any line-based data in your code files.

Frequently asked questions

The first occurrence of each line is kept and all subsequent duplicates are removed. The original order is preserved unless you enable the Sort option.
When enabled, "Apple" and "apple" are treated as different lines and both are kept. When disabled (default), comparison is case-insensitive and only one version is kept — whichever appears first.
No limit. You can paste thousands of lines. All processing happens locally in your browser so performance depends only on your device.
No. Everything runs in your browser. Your text never leaves your device.

Other tools you might like

🔢Sort Lines 🔍Find & Replace ✂️Whitespace Cleaner 🔖Line Number Adder 📊Word Counter ⚖️Text Diff Checker