AI Text Detector

Free Online AI Text Detector – Heuristic Writing Analysis

As AI writing tools become more common, educators, editors, content managers, and curious readers want to know whether a piece of text was likely written by a human or generated by artificial intelligence. Our free online AI text detector analyzes pasted content using heuristic signals—sentence uniformity, vocabulary diversity, and common AI buzzwords—to produce an estimated AI probability score from 0% to 100%.

Premium Toolz processes all text locally in your browser. Nothing you paste is sent to external servers, making this tool suitable for reviewing drafts, student essays, blog posts, and marketing copy in confidence. Please note that heuristic detection is inherently imperfect: skilled human writers can score high, and edited AI text can score low. Use results as one data point among many, not as absolute proof.

How the AI Text Detector Works

1. Paste your text: Copy the content you want to analyze into the text area.
2. Click Analyze: The tool evaluates multiple heuristic signals instantly.
3. Review the score: See an AI probability percentage and Human/AI/Mixed label.
4. Check metrics: Examine sentence uniformity, buzzword count, and vocabulary diversity.

Signals We Analyze

• Sentence uniformity: AI text often uses similar sentence lengths throughout.
• AI buzzwords: Words like "delve," "comprehensive," "Furthermore," and phrases like "it's important to note."
• Type-token ratio: Lower vocabulary diversity can indicate repetitive AI phrasing.
• Formal transitions: Overuse of "Moreover," "Additionally," and "In conclusion."
• Average sentence length: Very uniform mid-length sentences are a common AI pattern.

Who Uses AI Detection Tools?

Teachers screening student submissions, hiring managers reviewing cover letters, SEO professionals auditing outsourced content, and journalists verifying sources all benefit from quick heuristic checks. While no free browser tool replaces forensic linguistic analysis or commercial detection platforms, our detector provides a fast, private first pass that helps you decide whether deeper investigation is warranted.

Combine this tool with our Text Humanizer if you want to make formal or AI-sounding text read more naturally. For case formatting, word counting, and other writing utilities, explore the full Premium Toolz library at premiumtoolz.com.