Remove Duplicate Lines
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Original lines
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Duplicates removed
0
Unique lines
Cleaned output
How to Use Remove Duplicate Lines
1
Paste Your Lines
Paste a list of lines, one per line, from a text file, spreadsheet, or any source.
2
Configure Options
Toggle case-insensitive matching, trim whitespace, sort alphabetically, and remove empty lines.
3
Clean & Export
Click Remove Duplicates, review how many lines were removed, then copy or download the result.
Key Features
Instant Deduplication
Removes duplicate lines in a single click while preserving the first occurrence order.
Case-Insensitive Matching
Treat "Hello" and "hello" as duplicates when the case-insensitive option is enabled.
Sort & Trim Options
Sort output alphabetically and trim leading/trailing whitespace from every line.
Removal Statistics
See exactly how many duplicate lines were removed and how many unique lines remain.
100% Client-Side
Your data is processed locally in your browser and never sent to a server.
Frequently Asked Questions about Remove Duplicate Lines
Each line is compared against previously seen lines. If a line is identical (or case-insensitively identical when enabled), it is removed.