Remove Duplicate Lines
Remove duplicate lines from text, sort lines, and clean up lists instantly.
How to Use Remove Duplicate Lines
- 1
Paste your text with duplicate lines into the input box.
- 2
Configure options: case sensitivity, sort order, trim whitespace, remove blanks.
- 3
Click "Remove Duplicates" to process the text.
- 4
Review the cleaned output and the count of removed duplicates.
- 5
Click "Copy" to copy the result to your clipboard.
About Remove Duplicate Lines
The remove duplicate lines tool quickly cleans up any text by eliminating repeated lines. With options to sort alphabetically, ignore case, trim whitespace, and remove blank lines, it handles spreadsheet exports, email lists, keyword lists, and log files in under a second.
Key Features
- Instant Deduplication: Removes repeated lines while preserving original order by default.
- Case-Insensitive Matching: Optionally treat "Apple" and "apple" as duplicates.
- Whitespace Trimming: Normalize lines before comparing so " apple " matches "apple".
- Blank Line Removal: Strip empty lines from output in the same pass.
- Large Input Support: Handles 500,000+ lines entirely in your browser.
Who Is This For?
Data analysts cleaning exported CSVs, SEO professionals deduplicating keyword lists, developers filtering log outputs, and marketers cleaning email subscriber lists — anyone who needs fast, reliable text deduplication.
Privacy & Security
Runs 100% in your browser — no signup, no uploads, no data stored.