CheckerAI

CheckerAI helps you check writing for potential signs of AI-generated text. You can paste text or upload a document to receive an overall score plus highlighted passages that may look like output from ChatGPT, GPT-style models, Claude, or Gemini.

The tool is designed for practical review: after running the detection, you can read the flagged sections alongside your original writing, with surrounding sentences still visible. This makes it easier to evaluate what triggered the highlight and to focus your attention where it matters most.

CheckerAI supports PDF, Word, and text files (including TXT and Markdown) up to 20 MB. For longer documents, it checks in sections and then provides one overall result when the full text has been processed.

Use it when you want an AI-focused editorial checkpoint—such as before submitting an essay, reviewing student work, preparing content for publication, or revisiting team documents. The checker is free and requires no sign-up. The score is an estimate meant to support your review in context, not proof of authorship.

Is CheckerAI free to use?

Yes. CheckerAI is free to use and you can run checks without signing up.

What input formats and file size does CheckerAI support?

You can paste text or upload PDF, Word, TXT, or Markdown. Uploads can be up to 20 MB.

What do the overall score and highlights mean?

The overall score is an estimate where a higher score indicates more signs of AI writing found. Highlights mark specific passages for you to review in context.

Can CheckerAI check longer documents?

Yes. Longer texts are checked in sections, and you’ll receive one overall result after all sections are processed.

Does the checker work like a plagiarism checker?

No. CheckerAI is an AI detector, not a plagiarism checker.

Are the results a guarantee of AI authorship?

No. Treat the results as a starting point for review—read the flagged passages and verify facts and citations separately.