Online duplicate text checker

Compare two text sources to find duplicate content and calculate similarity percentage instantly.

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11,180+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

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About This Tool

The Duplicate Text Checker is a powerful online tool that helps you identify duplicate content between two text sources. Simply paste text, upload files, or use a combination to compare documents, articles, code, or any text content. The tool performs a comprehensive analysis, highlighting duplicate sections and calculating an overall similarity percentage. It's perfect for writers, editors, students, and professionals who need to ensure content originality or find overlapping text between documents.

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How to Use

Enter or paste your first text in the 'Original Text' area\n
Enter or paste your second text in the 'Text to Compare' area\n
Alternatively, upload text files using the file upload buttons\n
Click the 'Check for Duplicates' button to analyze\n
View the similarity percentage and highlighted duplicate sections in the results

Frequently Asked Questions

Find Quick Answers

What types of files can I upload?

You can upload plain text files (.txt) and common document formats including .doc, .docx, .pdf, and .rtf. The tool extracts text content from these files for comparison.

How is the similarity percentage calculated?

The tool uses advanced text comparison algorithms that analyze word sequences, sentence structures, and content patterns to determine the percentage of duplicate content between the two sources.

Is my text data stored or shared?

No, all text processing happens entirely in your browser. Your content is never sent to any server or stored anywhere, ensuring complete privacy and security.

Can I compare very long documents?

Yes, the tool can handle documents of substantial length, though extremely large files may take longer to process. For best performance, we recommend documents under 50,000 words.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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