📋 Free Plagiarism Checker — Detect copied content instantly. No sign-up needed. Check now →
🔍 AI Detector
📋 Free · Instant · No Sign-Up

Plagiarism Checker — Fast & Accurate

Detect copied, paraphrased, or duplicate content instantly. Get a similarity score, sentence-level highlights, and a downloadable PDF report — completely free.

Similarity score 0–100%
Sentence-level highlights
PDF report download
190+ languages supported
📋 Check Your Text for Plagiarism 0 / 10,000 chars
0 characters · 0 words
0%
Plagiarism
Similarity Score

Content Similarity Distribution —
Original Possibly Similar Likely Plagiarised
📄 Sentence-Level Analysis
Likely plagiarised
Possibly similar
Original content
💡 How to Improve Originality

How Does the Plagiarism Checker Work?

Advanced AI analyses your text across multiple similarity dimensions simultaneously

1

Paste Your Text

Copy and paste any text — essay, article, report, or assignment — into the input box above.

2

Instant Analysis

Our AI analyses sentence patterns, phrase structures, and semantic similarity against known content patterns.

3

Get Your Report

See a 0–100% similarity score, sentence-level highlights, and specific suggestions to improve originality. Download a PDF report.

Why Use ZeroGPTFree Plagiarism Checker?

Built for students, educators, and content professionals who need fast, reliable originality checks

🔍

Deep Similarity Analysis

Detects exact matches, paraphrased content, and structurally similar phrases — not just word-for-word copies.

✅

100% Free — No Limits

No account, no daily limit, no paywall. Run as many checks as you need, completely free.

⚡

Instant Results

Get your similarity score, sentence highlights, and improvement suggestions in seconds.

📄

PDF Report

Download a professional PDF report showing your score, verdict, and highlighted sentences — shareable with educators or reviewers.

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190+ Languages

Works with English, Arabic, French, Spanish, German, Chinese and all major languages with high accuracy.

🎓

Academic Integrity

Trusted by students and educators to verify originality of essays, dissertations, reports, and research papers.

Your Questions, Answered
How does the plagiarism checker detect copied content?+
The checker uses AI to analyse your text across multiple similarity signals: exact phrase matches, paraphrased sentence patterns, structural uniformity, vocabulary overlap, and semantic similarity. Each sentence is individually scored and colour-coded — red for likely plagiarised, orange for possibly similar, green for original.
What does the similarity score mean?+
The score is a 0–100% estimate of how much of your text shows similarity to existing content patterns. 0–15% is generally considered original. 15–40% suggests some similarity worth reviewing. Above 40% indicates significant similarity and those sections should be rewritten or properly cited.
Can it detect paraphrased plagiarism?+
Yes. The checker analyses semantic similarity and structural patterns, not just exact word matches. Text that has been paraphrased or lightly reworded but preserves the same meaning, structure, and argument flow will still be flagged as possibly similar or likely plagiarised.
Is my text stored after checking?+
No. Your text is processed in real time and not stored, saved, logged, or shared. Nothing is retained once the result is returned to your browser.
Can I use this to check student assignments?+
Yes. Teachers and lecturers can paste student work to quickly check for similarity indicators. Results should be used as supporting evidence alongside other assessment methods — not as sole proof of academic misconduct. Discuss flagged results with students using the highlighted sentence analysis.
Is it really free with no word limit?+
Yes — 100% free. No account, no daily limit, no credit card required. Up to 10,000 characters per check. For longer documents, split into sections and check each part separately.