How to Check If Text Is AI Written
AI-generated text now appears in academic submissions, news articles, job applications, and content at scale. This guide explains how AI detectors work and how to check any text for AI authorship — free and without an account.
Free Tool
Free AI Text Detector
No account required · Free forever
Step-by-Step Guide
- 1
Copy the text you want to check
Select all the text from the document, email, or submission and copy it. The detector works best with 100+ words.
- 2
Paste into the AI detector
Open the free AI text detector and paste the text into the input field. No account or sign-in is required.
- 3
Click 'Detect AI Content'
The tool analyzes perplexity (how predictable the word choices are) and burstiness (variation in sentence length) — both signals of AI generation.
- 4
Review the probability score
Scores above 70% indicate strong AI authorship. Scores below 30% suggest human writing. The 30–70% range often indicates AI-assisted or heavily edited content.
- 5
Check the sentence-level breakdown
The detailed view highlights individual sentences scored as likely AI-generated, helping you identify which parts of the text are suspicious.
Who This Is For
Teachers and professors
Screening student essays and written assignments before grading to flag likely AI-generated submissions for further review.
Hiring managers
Checking cover letters and writing samples submitted with job applications for AI generation.
Content editors
Reviewing freelance-submitted articles and blog posts to ensure they are human-written before publishing.
Frequently Asked Questions
Can the detector identify ChatGPT, Claude, and Gemini?
Yes. The detector is calibrated for output from all major AI models including ChatGPT (GPT-4), Claude, and Gemini. It uses statistical signals rather than model-specific fingerprints, so it generalizes to new AI models as well.
How accurate is AI text detection?
Accuracy is high on clearly AI-generated content (90%+) and lower on heavily edited or humanized text. No detector is 100% accurate — use the score as one signal among several, not as definitive proof.
Can AI-generated text be edited to evade detection?
Yes. Heavy editing, paraphrasing, and AI humanizer tools can lower detection scores. This is why detection scores should be used alongside other evidence — not as standalone proof of AI authorship.