Check text for plagiarism, duplicate content, and AI-generated writing. Get an originality score with highlighted matches and AI detection analysis. 100% browser-based  your text never leaves your device.
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Copy your content and paste it into the text area, or upload a .txt file. The tool accepts up to 50,000 characters.
Click Check Plagiarism. The tool analyzes your text for internal repetition, n-gram overlaps, and AI-generation patterns.
See your originality percentage, highlighted duplicate sections, AI likelihood score, and a detailed breakdown of repeated phrases and suspicious patterns.
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Plagiarism CheckerCheck text for plagiarism, duplicate content, and AI-generated writing. Get an originality score with highlighted matches and AI detection analysis. 100% browser-based  your text never leaves your device.
Grammar CheckerCheck your text for grammar errors, spelling mistakes, and punctuation issues. Get writing suggestions and readability analysis. 100% browser-based  your text never leaves your device.
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Plagiarism Checker is a free online tool that helps you check text for plagiarism, duplicate content, and ai-generated writing. get an originality score with highlighted matches and ai detection analysis. 100% browser-based ã¢â‚¬â€ your text never leaves your device. With Originality Score: get a percentage-based originality rating from 0-100% with color-coded severity indicators for quick assessment. AI Detection: statistical analysis estimates the likelihood your text was ai-generated using perplexity, burstiness, and pattern analysis, the tool makes seo tasks straightforward and efficient. Every operation runs locally in your browser — your data stays private and never leaves your device.
Plagiarism Checker processes everything on your device, eliminating the need for server uploads or software installation. This approach is particularly useful for check blog posts and articles for unintentional duplicate content before publishing detect ai-generated text in student submissions and freelance work. Whether you need originality score or more advanced seo operations, Plagiarism Checker delivers reliable results without compromising on security or performance.
This tool performs local analysis on your text  detecting internal repetition, n-gram overlaps, and AI-generation patterns. For web-wide plagiarism checking, the results are best used as a pre-check before submitting to services that search public databases. All processing happens client-side for complete privacy.
Our AI detector uses three statistical signals: perplexity (how predictable the text is  AI text tends to be more predictable), burstiness (variance in sentence length  AI text tends to be more uniform), and repetitive pattern analysis (frequency of n-gram reuse). These signals are combined into a confidence score.
No. Everything runs entirely in your browser using JavaScript. Your text never leaves your device. This is the core privacy advantage of our tool.
Plain text input and .txt file upload. Maximum 50,000 characters per check.
Internal plagiarism detection (repeated phrases, n-gram overlap within the document) is highly accurate. AI detection accuracy varies by content type  it works best on longer texts (500+ words) and is most reliable for academic/professional writing.
Get a percentage-based originality rating from 0-100% with color-coded severity indicators for quick assessment.
Statistical analysis estimates the likelihood your text was AI-generated using perplexity, burstiness, and pattern analysis.
Repeated phrases, n-gram overlaps, and suspicious sections are highlighted inline with context and frequency counts.
View a complete breakdown: total words, sentence count, unique vs repeated phrases, top repeated n-grams, and AI probability score.
Plagiarism Checker is useful in a variety of scenarios across different workflows:
Check blog posts and articles for unintentional duplicate content before publishing
Detect AI-generated text in student submissions and freelance work
Review internal documentation for consistency and avoid repetitive phrasing
Pre-check content before submitting to commercial plagiarism databases
AI detection accuracy improves significantly with texts over 500 words. Shorter texts may show higher variance in confidence scores.
High keyword density can sometimes trigger false positives in n-gram analysis. Cross-reference with our Keyword Density tool for a complete picture.
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Grammar Checker
Check your text for grammar errors, spelling mistakes, and punctuation issues. Get writing suggestions and readability analysis. 100% browser-based  your text never leaves your device.
Keyword Density Analyzer
Analyze keyword frequency and density in any text for SEO optimization.
Heading Analyzer
Extract and analyze heading structure (H1-H6) from any HTML.
SERP Preview
Preview how your page will appear in Google search results with title, URL, and meta description.
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Generate optimized meta tags including OG and Twitter Card tags.
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Validate and test your robots.txt rules against specific URLs.
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