Easily detect and remove duplicate lines from your text with our free online Duplicate Line Checker. Whether you’re cleaning up email lists, code files, or large text documents, this tool helps you save time and improve accuracy.
Fast & Accurate: Instantly scan and highlight duplicate lines.
Case-Sensitive or Ignore Case: Choose whether “Hello” and “hello” are treated the same.
File Upload Support: Check duplicates from uploaded text files.
One-Click Results: Get clean, duplicate-free text with a single click.
Duplicate lines can cause errors, waste storage space, and make your content look unprofessional. By using our tool, you can:
Improve data quality and accuracy.
Save time in manual cleanup.
Ensure unique and organized text for reports, scripts, or lists.
Paste your text into the box or upload a file.
(Optional) Check Ignore Case if needed.
Click Check Duplicates to find repeated lines.
Review and remove duplicates instantly.
✅ No installation needed – works directly in your browser.
✅ Free & Secure – your data is never stored.
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