Free AI Content Detector
Instantly detect whether text is written by AI (ChatGPT, GPT-4, Gemini, Claude) or a human. Sentence-level analysis with highlighted results — no signup, no limits.
How Our AI Content Detector Works
Three simple steps to verify any text in seconds.
Paste Your Text
Copy and paste any text — blog posts, essays, emails, product descriptions, or social media content — into the text box above.
Click Analyse
Our algorithm examines perplexity, burstiness, sentence structure, vocabulary patterns, and stylistic markers across every sentence.
Review Results
Get an overall AI probability score plus sentence-level highlighting so you can see exactly which parts look AI-generated and which look human-written.
Key Features of BrightlyFuture AI Detector
Everything you need to verify content authenticity.
Sentence-Level Detection
Every sentence is individually scored and colour-coded so you can pinpoint exactly which parts were likely written by AI.
Perplexity & Burstiness Analysis
We measure how predictable and uniform the text is — two key markers that distinguish human writing from machine output.
Multi-Model Detection
Trained to recognise patterns from ChatGPT, GPT-4, GPT-4o, Gemini, Claude, LLaMA, and other popular large language models.
Works in Multiple Languages
Analyse content in English, Spanish, French, German, Hindi, Urdu, Arabic, and more — with accurate detection across languages.
100% Private & Secure
Your text is never stored, logged, or shared with third parties. Analysis happens in your browser — your content stays yours.
Instant Results
Get detailed analysis in under 5 seconds. No queues, no waiting, no daily limits — analyse as many texts as you need.
Who Is This AI Detector For?
Built for anyone who needs to verify content authenticity.
Teachers & Educators
Verify student submissions for AI-generated content before grading assignments and essays.
Content Managers
Screen freelancer deliverables and guest posts to ensure originality before publishing.
SEO Professionals
Check whether content meets Google’s E-E-A-T guidelines and doesn’t trigger AI-content penalties.
Recruiters & HR Teams
Verify cover letters, writing samples, and application essays for authenticity.
Publishers & Editors
Maintain editorial standards by screening manuscripts, articles, and contributed content.
Bloggers & Writers
Self-check your own AI-assisted drafts to ensure they read as human-written before publishing.
How We Compare to Other AI Detectors
See why BrightlyFuture is the best free AI content detector.
| Feature | BrightlyFuture | GPTZero | Originality.ai | Copyleaks |
|---|---|---|---|---|
| Free to Use | ✓ | Limited | ✗ | Limited |
| No Signup Required | ✓ | ✗ | ✗ | ✗ |
| Sentence-Level Highlighting | ✓ | ✓ | ✓ | ✗ |
| Perplexity & Burstiness Scores | ✓ | ✓ | ✗ | ✗ |
| Multi-Language Support | ✓ | Limited | ✓ | ✓ |
| Unlimited Scans | ✓ | ✗ | ✗ | ✗ |
| No Credit Card Needed | ✓ | ✓ | ✗ | ✓ |
| Downloadable Reports | ✓ | ✗ | ✓ | ✓ |
| Privacy (No Data Stored) | ✓ | ✗ | ✗ | ✗ |
Tips for Accurate AI Detection
Get the most reliable results from your scans.
Use at Least 50 Words
Short snippets lack enough statistical signal for reliable analysis. Paste at least 50 words — 150+ words gives the most accurate results.
Test Full Paragraphs, Not Fragments
Sentence fragments and bullet points can skew detection. Use complete paragraphs with natural sentence structure for best accuracy.
Check Multiple Sections Separately
In long documents, different sections may have different authors. Analyse introduction, body, and conclusion separately for granular insight.
Understand That No Detector Is 100% Accurate
AI detection is probabilistic, not definitive. Use results as one data point alongside your own editorial judgement — never as the sole basis for consequential decisions.
Beware of Paraphrasing Tools
Text that has been run through a paraphrasing or spinning tool can reduce detection accuracy. If you suspect this, look for unnatural phrasing and vocabulary inconsistencies.
More Free Tools from BrightlyFuture
Explore our growing library of AI-powered tools.
AI Blog Generator
Generate SEO-optimized, human-sounding blog posts in 30 seconds. No signup required.
Try NowAI Paragraph Rewriter
Rewrite paragraphs to sound more natural, improve readability, and bypass AI detection patterns.
Try NowWord & Character Counter
Check word count, character count & reading time for SEO-optimal content length.
Try NowFrequently Asked Questions
Everything you wanted to know about our AI Content Detector.
Yes — 100% free with no hidden costs, no trial period, and no upgrade prompts. Every feature, including sentence-level analysis, stays free forever.
No signup, no email, no account required. Just paste your text, click Analyse, and get instant results.
Our detector analyses perplexity, burstiness, sentence structure, and vocabulary patterns to produce reliable results. However, no AI detector is 100% accurate — results should be used as one factor alongside editorial judgement.
It detects patterns from ChatGPT (GPT-3.5, GPT-4, GPT-4o), Google Gemini, Anthropic Claude, Meta LLaMA, Mistral, and other popular large language models.
Perplexity measures how predictable the text is. AI-generated text tends to have low perplexity (very predictable word choices), while human writing is more varied and surprising. Higher perplexity generally indicates human authorship.
Burstiness measures the variation in sentence length and complexity. Humans naturally write with high burstiness — mixing short punchy sentences with longer complex ones. AI tends to produce uniformly structured sentences with low burstiness.
No. All analysis happens in your browser. Your text is never stored, logged, sent to a server, or shared with any third party. Your privacy is fully protected.
We recommend at least 50 words for a basic scan. For the most accurate results, paste 150 words or more. Very short texts (under 30 words) may not contain enough patterns for reliable detection.
Paraphrasing tools can reduce detection accuracy, but many AI patterns — such as sentence uniformity and vocabulary choices — often survive paraphrasing. Results may show as “mixed” rather than definitive.
Yes — it supports English, Spanish, French, German, Hindi, Urdu, Arabic, and more. Detection accuracy is highest for English but works across all supported languages.
Absolutely. Many writers use our detector as a self-check tool — paste your AI-assisted draft, see which sentences flag as AI, then rewrite those sections to sound more natural before publishing.
Plagiarism checkers compare text against existing content to find copied passages. AI detectors analyse writing patterns to determine whether the text was generated by an AI model — even if the content is completely original. They solve different problems.
Google’s official policy is that AI content is acceptable if it’s helpful, accurate, and demonstrates E-E-A-T. However, low-quality, mass-produced AI content without human review can hurt rankings. Use our detector to identify and improve weak sections.
No limits at all. Analyse one text or one thousand — there are no daily caps, no word limits, and no throttling.
Yes — use the Copy Report button to copy a text summary, or Download Report to save a .txt file with the full analysis including scores, sentence breakdown, and verdict.
Is Your Content AI-Written?
Find out in seconds — paste your text and get instant sentence-level analysis. Free forever.
🕵 Analyse Text Now — It’s Free