Duplicate Line Remover

Enter a URL and click the “check” button to determine the content’s keyword density!

Lines: 0 | Unique: 0 | Duplicates: 0
Unique Lines (Results):
Duplicate Lines (Removed):

What is a Duplicate Line Remover?

The Online Duplicate Site Remover is a free and easy-to-use tool designed to help you clean up lists of websites, urls, keywords or any type of lines by identifying and removing duplicate entries. Whether you're organizing domain names, managing large URL databases, or cleaning data for SEO analysis, this tool ensures that each site (line, keyword,...) appears only once — resulting in a clean, efficient, and accurate list.

In addition to removing duplicates, the tool can delete empty lines and trim any unnecessary whitespace from each entry, giving you a properly formatted list with minimal effort.

How to Use Our Duplicate Line Remover?

  • Paste your list of website URLs into the input box or any other lines.
  • Choose your cleaning options (all are selected by default):
    • Remove duplicate entries
    • Delete empty lines
    • Trim whitespace
  • Click “Remove Duplicates” and get your clean list instantly.
  • Copy the cleaned list.

Why Remove Duplicate Lines?

Duplicate lines in text or data files create clutter, inefficiency, and can lead to errors. Here's why deduplication matters:

Cleaner Data

Eliminate redundancy to make files easier to read, analyze, and manage.

Improved Accuracy

Avoid mistakes caused by repeated entries in logs, lists, or datasets.

Faster Processing

Reduce file size and speed up tasks like code compilation or data sorting.

Better Organization

Keep only unique entries in lists, emails, or inventory records.

Optimized Storage

Save space when working with large text files or databases.

Key Features of Our Tool

  • Fast Duplicate Detection – Instantly finds and removes duplicate website entries in any list.
  • Empty Line Removal – Automatically deletes blank lines for a neater list.
  • Whitespace Trimming – Cleans up leading and trailing spaces or tabs from each line.
  • File Upload Support – Paste your data, upload a text file, or drag-and-drop it directly into the tool. This feature will be available in the future.
  • Fully Customizable Options – Enable or disable specific clean-up options according to your needs.
  • No Sign-up Required – Use the tool right away — no registration or installation needed.

Real life case studies

SEO Agency Cleanup: A digital marketing firm managing client backlinks used our tool to clean 10,000+ URL entries. The tool helped reduce the list by 35% by removing duplicates and standardizing the format — saving hours of manual review time.

Academic Research Project: A university research group compiling web resources for open data projects used the tool to streamline their URL lists, improving data reliability and minimizing errors in automated crawlers.

E-Commerce Site Migration: An online retailer used the Duplicate Site Remover during a domain migration project to avoid redirect loops and broken links caused by duplicate URLs in legacy lists.

Example use case

Before:

example.com
testsite.com
example.com
  mypage.net
testsite.com

webdata.org

After:

example.com
testsite.com
mypage.net
webdata.org

Testimonials

"Simple, fast, and effective. Exactly what I needed to clean up a huge list of domains for an audit."
— Julia K., SEO Specialist
"Saved me hours of Excel work. The whitespace trim feature is a bonus!"
— Marcus T., Data Analyst
"I used this tool during a site migration. It's a small tool with a big impact."
— Linda G., Web Developer

History and purpose

The Online Duplicate Site Remover was developed in response to a growing need for simple, no-frills tools to handle the everyday tasks of web professionals, data engineers, and researchers. What started as an internal tool has evolved into a public service that has helped thousands streamline their workflows.

Our mission is to provide clean, fast, and free solutions for data management — no downloads, no logins, just results.