AI Content Detector estimates how much a piece of writing resembles machine-generated text by looking at three patterns: how much sentence length varies, how varied the vocabulary is and how many stock phrases appear. Paste at least 50 words to get a likelihood score and a breakdown of the signals. It runs in your browser, nothing you paste is sent anywhere, and it is honest about its limits: no detector can prove who or what wrote a text.
Made for writers and job seekers. Typical uses:
A paragraph of uniform 18-word sentences with repeated transitions such as "moreover" and "furthermore" scores higher than a paragraph that mixes short and long sentences and uses concrete details. That says something about style, not authorship: a careful human writer can produce either.
Detectors give false positives and false negatives. Formal writing, edited text, short passages and writing by non-native English speakers are more likely to be misjudged, and edited AI text is harder to detect. Never use a score alone to accuse someone.
Accuracy: These tools use rules, heuristics or established open-source models (such as Tesseract for OCR) running in your browser, not a generative AI service or a human editor. Treat results as guidance and review them yourself.
Expert Tip
If a passage scores high, ask whether it says anything only you could say. Adding specifics, examples and your own view improves the writing whoever wrote it.
This tool looks at a piece of text and estimates how much its writing patterns resemble those common in machine-generated text. It measures three things: how much sentence length varies, how varied the vocabulary is and how many stock phrases appear, and combines them into a likelihood. It needs at least 50 words, runs in your browser and nothing you paste is sent anywhere.
The result is an estimate from patterns, not proof of how a text was written. No detector, including this one, can see who or what wrote the words, and all of them make mistakes in both directions: they label human writing as AI, and AI writing as human.
AI-generated text is designed to read like human writing, and the differences shrink with each new model. At the same time, some human writing looks "machine-like" to a detector: formal, plain, carefully edited prose, text by writers using a second language and short passages all tend to be scored as more predictable. Research and independent tests of commercial detectors have repeatedly found false positives, including for essays written by people, and evidence that non-native English writers are flagged more often.
Editing changes the picture as well. A generated draft that a person rewrites, or human writing polished with a grammar tool, sits somewhere in the middle, and the score becomes less meaningful the more mixed the text is. Short texts, under a few hundred words, give too little evidence for any reliable result.
The right way to use a detector is as one weak signal among several, never as a verdict. If a score is high, treat it as a reason to look more closely, not as a conclusion.
If you use AI tools for help, the ethical and practical answer is to be transparent about it where rules require, and to make sure the finished work reflects your own knowledge. Text that is specific, opinionated and grounded in your experience is both more useful and less generic. Vary your sentence length naturally, use concrete examples, cite real sources and read the result aloud to check that it sounds like you.
Avoid "humanizer" tools that promise to beat detectors. They tend to make text worse, and following your institution's or client's policy matters more than any score.
Some patterns that raise a score are stylistic rather than diagnostic. Very even sentence lengths make prose read like a template. Frequent use of the same transition words, such as "moreover", "furthermore" and "in conclusion", makes it feel formulaic. Generic statements with no examples are typical of generated text, but also of rushed student writing. If the tool flags a passage, ask yourself whether it says anything only you could say; if not, revising it improves the writing whoever wrote it.
The article are AI content detectors accurate goes deeper into the evidence and the risks. To improve a draft, the Grammar Checker fixes mechanical errors, the Paraphrasing Tool helps you reword your own sentences, and the Text Summarizer condenses long text. Everything runs in your browser and nothing is stored.
How AI detectors work, why they make mistakes in both directions, who is most at risk of false accusations, and how to use a detection score responsibly.
Explore more in AI Tools, read the guides and articles, or see how we test our tools.
Find spelling mistakes and common grammar errors, with one-click fixes.
Best for proofreading an email before sending it
Rewrite text with synonym replacement. Client-side processing, privacy-first.
Best for avoiding repetition in your own drafts
Summarize long text into shorter versions. Client-side processing, no data sent to servers.
Best for deciding whether a long article or report is worth reading in full
Count words, characters, sentences, and paragraphs in any text.
Best for checking word count for essays, articles, and blog posts
Generate optimized prompts for AI tools.
Best for building a more detailed Midjourney or DALL-E prompt for better image results