Originality.ai℠ is the Most Accurate AI Detector in third-party studies. Check up to 2,000 words with 3 Free AI Scans Per Day.

















































Step 1
Add Text
Paste, Upload, or URL

Step 2
Scan
AI Allowance, Plagiarism, Content Quality, and more

Detect AI Paraphrasing
Our team actively tests AI tools that change, modify, or edit text (e.g. Quillbot or Grammarly) and continuously improves our AI detector to ensure attempts to hide AI-altered text are still detectable.

Manage False Positives
Check for AI and plagiarism with the Originality.ai Chrome Extension.
Peace of mind for writers and students to show the authorship of writing, with a Writing Replay.


Writers, Editors & Marketers

Teachers & Students

Enterprise & Schools
Discover flexible pricing for students, teachers, small teams, agencies, publishers, and enterprise.

Is the Originality.ai AI detector free?
Is Originality.ai free, or is there a free Originality trial? We don’t offer a free trial of Originality.ai. Instead, we offer a limited free AI detection tool, with 3 free daily scans.
What Can Cause False Positives?
Tools that use AI to rewrite or edit copy (e.g., some Grammarly features) can cause false positives. Shorter text may impact accuracy; we have a 100-word minimum at Originality.ai.
Classic Model: An AI detection score of 60% Likely Original and 40% Likely AI is not a false positive. It correctly predicted with 60% confidence that your content was Likely Original.
AI Allowance scans (new): Align how much AI you allow with project guidelines.
How Can I Show My Work or Assignment is Original?
An AI score shouldn’t be used alone for academic integrity discipline.
Students and Writers: Share accuracy studies and show your writing process with our Chrome Extension.
Can I See Previous Scans?
Yes, scan history is stored for later retrieval or sharing. Complete removal of your account and data is available upon request.
What Languages Does Originality.ai AI Detection Support?
With Originality.ai, you can check if text is written by AI in 30 languages, with an overall accuracy of 97.8% for our multilingual model. Multilingual AI Accuracy Study.
Do Credits Expire?
Yes, per our Terms and Conditions, credits expire 2 years from the date of purchase.
How many free AI scans are there?
Check up to 2,000 words with the free AI checker, and run up to 3 free AI scans daily. To scan more words, upgrade to premium.
Do I need an account to run a free AI scan?
No, you can run up to 3 free AI scans daily without an account. To scan more words and run additional scans, you can conveniently sign up for Originality.ai.
Is my pasted text stored, shared, or used for training?
Text input into the free AI detector may be used for training. Users with an Originality.ai account can opt out of data use for AI training.
What does the AI score mean?
AI scores are predictions (probabilities) on whether text is AI-generated or Original (human-written). At Originality.ai, we emphasize that AI scores reflect probability, not guilt.
If you select AI Allowance, you choose how much AI you allow. So, your AI score reflects whether the percentage of AI writing is likely more or less than your selection.
Should an AI score be used on its own?
Use an AI score as one signal, not a final decision. Review other details like writing history and drafts before any high-consequence decisions. Always keep a human reviewer in the loop.
How does the Originality.ai AI detector work?
The Originality.ai AI Checker is based on a modified version of the BERT model and forms part of our patented all-in-one text analysis and verification system (U.S. Patent No. 12,253,988). For in-depth details on training, fine-tuning, and more, check out this blog post and this post to learn about our patented technology.
Does Originality.ai Detect AI Paraphrasing?
Originality.ai is accurate at detecting AI-paraphrased content (e.g., Quillbot). If you permit AI paraphrasing, adjust how much you allow with AI Allowance; read more in our accuracy study.
What Are AI Detection False Positives?
AI Detection false positives happen when human writing is incorrectly classified as AI-generated. At Originality.ai, we transparently share false positive rates in our accuracy study.
Note: False positive rates can vary by AI detection model and brand.