Remove Duplicate Lines Online
Remove, extract, and count duplicate lines from text or CSV data. Create clean, unique lists instantly.
Remove and Check Duplicate Lines in Real Time
Remove, extract, and count duplicate lines from plain text, CSV files, and spreadsheet data. Simply paste your list to generate unique entries or view detailed repetition counts instantly. All processing happens entirely inside your browser — your data never leaves your device.
How to Use
Here is a quick guide on how to remove duplicate lines and analyze repetition counts using copy and paste.
Paste Text into the Input Area
Paste the text you want to clean into the "Input Data" area on the left. Processing begins immediately, displaying total line counts and duplicate counts in the header.
Switch Tabs to Retrieve Results
Retrieve the Deduplicated Text
The "Remove Duplicates" tab outputs the unique list with all duplicate lines removed. Click "Copy" at the bottom right to copy it directly to your clipboard.
Inspect Duplicates in a Table
The "Check Duplicates" tab displays every repeated line along with its occurrence count. You can download the list as a CSV file or copy it into spreadsheets.
Real-Time Fast Processing
Detects duplicate lines as soon as you paste. Large datasets can be processed directly in your browser.
Duplicate Occurrence Count
Summarizes repeated lines and their occurrence counts in a clear table. Easily export or copy the duplicate list.
100% Free & No Sign-Up
No registration or login required. Access all features directly in your browser anytime.
Secure Local Processing
All data is processed strictly within your browser via JavaScript. No text is ever uploaded to our servers.
Mailing List and Contact Cleanup
Clean up mailing lists and contact sheets by keeping only one instance of each entry.
Spreadsheet and CSV Data Cleansing
Paste columns directly from Excel or Google Sheets to inspect duplicate items and their frequency.
Log Analysis and Error Extraction
Filter out repeated server logs and error entries to isolate unique issues and status codes.
What types of data can I process?
Is this tool completely free?
How does the duplicate removal work?
Is my data sent to any server?
Paste your text and remove duplicates now.