Duplicate Line Remover
Remove duplicate lines from text with multiple modes. 100% free and private - all processing happens in your browser.
Multiple Modes
Choose from 5 different modes to handle duplicates exactly how you need.
Detailed Statistics
View total lines, unique lines, duplicates removed, and most frequent line.
100% Private
Your text never leaves your computer.
Common Use Cases
Data Cleaning
Remove duplicate entries from lists, email addresses, phone numbers, or any data set.
Log Analysis
Identify unique error messages or find the most common log entries in system logs.
List Management
Clean up todo lists, shopping lists, or any text-based lists with duplicate items.
Code Review
Find duplicate imports, function names, or repeated configuration entries.
Frequently Asked Questions
How do I remove duplicate lines from text?
Simply paste your text into the input area. The tool will automatically remove duplicate lines and show the result. You can choose different removal modes and options.
What removal modes are available?
The tool offers 5 modes: Keep First (removes duplicates, keeps first occurrence), Keep Last (keeps last occurrence), Show Duplicates (shows only duplicate lines), Show Unique (shows lines that appear once), and Show Counts (displays each line with its count).
Is the comparison case-sensitive?
By default, the comparison is case-insensitive, meaning "Apple" and "apple" are treated as duplicates. You can enable case-sensitive mode using the checkbox option to treat them as different lines.
What does "Trim whitespace" do?
When enabled, leading and trailing spaces are removed from each line before comparison. This means " apple " and "apple" would be treated as duplicates.
Can I sort the output?
Yes! Enable the "Sort output" option to alphabetically sort the resulting lines. This works with all removal modes.
Is my text data private?
Absolutely. Your text never leaves your computer using JavaScript and is never sent to any server, ensuring complete privacy.