Remove Duplicate Lines
Remove duplicate lines from text. Clean up lists and data quickly.
How to Use Remove Duplicate Lines
Paste your text
Paste the text containing duplicate lines into the input area. Each line is treated as a separate entry for duplicate detection.
Choose matching mode
Select case-sensitive or case-insensitive matching. Case-insensitive mode treats lines with different capitalization as duplicates.
Remove duplicates
Click Remove Duplicates to filter out all repeated lines. The tool preserves the original order and keeps the first occurrence of each unique line.
Copy the result
Copy the deduplicated text with one click. The output contains only unique lines, ready for use in your project.
About Remove Duplicate Lines
Remove duplicate lines online — filter out repeated lines from text for free. Paste your text and instantly remove all duplicate entries while preserving the original order. Choose case-sensitive or case-insensitive matching for flexible duplicate detection. Perfect for cleaning data exports, email lists, log files, CSV data, code output, and any text with repeated lines. Handles large files with thousands of lines efficiently. Copy the deduplicated result with one click. No software needed — all processing runs privately in your browser.
Key Features
- Remove duplicate lines from text instantly with one click
- Option to keep first or last occurrence of each duplicate line
- Case-sensitive and case-insensitive duplicate detection modes
- Preserve original line order while removing only repeated entries
- Handle large text files with thousands of lines efficiently
- 100% private — all duplicate removal happens in your browser, text never leaves your device