Duplicate Line Remover

Duplicate Line Remover

Remove duplicate lines from text

Original Text

Options

"Apple" and "apple" are different
Sort unique lines alphabetically
Display removed duplicates

Unique Lines

Duplicates Removed

0
Original
0
Unique
0
Removed
0%
Reduction
Copied to clipboard!
`); newWindow.document.close(); } // Show notification function drShowNotification(message, type = 'success') { drNotificationText.textContent = message; // Change color based on type if (type === 'error') { drNotification.style.backgroundColor = '#dc3545'; } else { drNotification.style.backgroundColor = '#4b6cb7'; } drNotification.classList.add('show'); setTimeout(() => { drNotification.classList.remove('show'); }, 3000); } // Auto-process when options change drCaseSensitive.addEventListener('change', drProcessText); drSortLines.addEventListener('change', drProcessText); drShowDeleted.addEventListener('change', drProcessText);

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About this Tool

Duplicate Line Remover is a powerful, free online utility designed to help users clean and organize text by removing repetitive lines instantly. Whether you’re working with data lists, code snippets, email lists, survey responses, or any text content, our tool efficiently identifies and eliminates duplicate entries while preserving the original formatting.

Built with cutting-edge web technology, this tool operates entirely in your browser, ensuring complete privacy – your data never leaves your computer. With a focus on user experience, we’ve created an intuitive interface that works seamlessly on both desktop and mobile devices.

Our tool serves professionals across industries: developers cleaning code, data analysts processing datasets, content writers organizing research, students managing study materials, administrators handling email lists, and researchers analyzing textual data. The application’s versatility makes it an essential utility for anyone working with text-based information.

The algorithm powering this tool is optimized for speed and accuracy, capable of processing thousands of lines in milliseconds. Beyond simple duplicate removal, it offers advanced features like case-sensitive filtering, alphabetical sorting, and detailed analytics about the cleaning process.

How to Use

Step 1: Input Your Text

  • Paste your text containing duplicate lines into the “Original Text” box

  • You can paste from Excel, Word, emails, or any text source

  • No file uploads needed – just copy and paste

 
Step 2: Configure Options

  • Case Sensitivity: Toggle ON to treat “Apple” and “apple” as different (recommended for code)

  • Sort Lines: Enable to alphabetize results after duplicate removal

  • Show Deleted: Check to view all removed duplicates in a separate section

 
Step 3: Process Your Text

  • Click the “Remove Duplicate Lines” button

  • The tool instantly processes your text in real-time

  • No waiting, no server delays – processing happens locally

 
Step 4: Analyze & Export Results

  • View cleaned text in the “Unique Lines” section

  • Check statistics showing lines removed and reduction percentage

  • Copy results directly with one click

  • Download as text file or open in new tab

  • Compare original vs cleaned text side-by-side

Features

Core Functionality

  • ✅ Instant Duplicate Removal – Remove all repeated lines from any text

  • ✅ Case Sensitivity Option – Choose whether to ignore or respect capitalization

  • ✅ Smart Sorting – Alphabetically organize cleaned results

  • ✅ Real-Time Statistics – See line counts and reduction percentage instantly

  • ✅ Side-by-Side Comparison – View original and cleaned text simultaneously

 
Export & Sharing Options

  • 📋 One-Click Copy – Copy results directly to clipboard

  • 📥 Text File Download – Download cleaned text as .txt file

  • 🖥️ New Tab View – Open results in separate window for printing

  • 🔄 Live Updates – Results update instantly as you modify options

 
User Experience

  • 🚀 100% Browser-Based – No installations, no plugins required

  • 🔒 Complete Privacy – Your data never leaves your computer

  • 📱 Mobile Responsive – Works perfectly on phones and tablets

  • ⚡ Lightning Fast – Processes thousands of lines in milliseconds

  • 🎨 Clean Interface – Intuitive design with no learning curve

 
Advanced Capabilities

  • 📊 Duplicate Analysis – See exactly which lines were removed

  • 🔧 Bulk Processing – Handle large text files efficiently

  • 📝 Format Preservation – Maintains original line breaks and spacing

  • 🎯 Precision Control – Fine-tune duplicate detection settings

FAQs

What types of text work best with this duplicate remover?

 Our tool works with any text format including:

  • Email lists and contact directories

  • Code snippets and programming files

  • Survey responses and research data

  • Product catalogs and inventory lists

  • Article outlines and content plans

  • Student rosters and attendance sheets

  • Social media handles and usernames

  • Any CSV or tabular data converted to text

No, there are no artificial limits! The tool processes text locally in your browser, so performance depends only on your device’s memory. For optimal performance with extremely large files (50,000+ lines), we recommend processing in batches.

Yes, it is completely free to use with no hidden limits or requirements to sign up.

Your privacy is paramount. The tool runs directly in your web browser. We do not store, save, or even send the text you paste to our servers for processing. This ensures your data remains completely confidential.

When enabled (default), “Apple”, “APPLE”, and “apple” are treated as different lines. When disabled, all capitalization variations are considered identical. Choose based on your needs:

  • Enable for: Proper nouns, code variables, technical terms

  • Disable for: Email addresses, general terms, data normalization

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