Duplicate Line Remover
Remove duplicate lines, count occurrences, and deduplicate text data.
Key Features
Smart Dedup
Remove exact duplicates or case-insensitive duplicates.
Occurrence Count
See how many times each unique line appears in your text.
Copy & Download
Copy deduplicated results or download as a .txt file.
100% Private
All processing happens locally in your browser.
Understanding Duplicate Line Removal
Uses HashSet for O(n) duplicate detection. For large files, uses external sorting strategy with temporary files. Fuzzy dedup uses Levenshtein distance to detect similar lines for data cleaning.
Frequently Asked Questions
How does the Duplicate Line Remover work?
Simply paste or type your text and the results update instantly. All processing happens locally in your browser.
Is my text data safe?
Yes, 100%. All processing is done client-side in your browser. No text data is sent to any server.
What is the maximum text size?
There is no fixed limit. Processing depends on your device's available memory. Most users can handle files up to 50MB comfortably.
Can I download the result?
Yes, use the Copy button to copy to clipboard or download the result as a text file.
Do I need to create an account?
No. All tools are completely free with no signup, no usage limits, and no hidden fees.