CheckerAI

CheckerAI is a free AI detector for checking text and documents for signs of AI writing from ChatGPT, GPT, Claude, and Gemini. Paste text or upload PDF, Word, TXT, or Markdown (up to 20 MB), then get an overall score plus highlighted passages to review in context. It works without an account and is meant for essays, student work, articles, and team content review—not as proof of authorship by itself.