ZeroGPT

Paste or upload a piece of text into ZeroGPT and you get back an AI probability score, shown as a percentage.

ZeroGPT is a free AI content detector and AI plagiarism checker that scans writing to judge whether it came from a model rather than a person.

It runs in the browser at zerogpt.tools, so there is nothing to install.

The tool scans sentence by sentence and returns a report, which is more useful than a single verdict when you want to see which passages look machine-written.

It is meant for students, bloggers, professionals and other writers who need to check originality or find AI-generated text before they publish or submit it.

The text it looks for comes from popular models such as ChatGPT, Gemini, Claude AI and Google Bard.

Under the hood, ZeroGPT relies on its own algorithms and APIs to produce the score.

Pricing is free, which makes it an easy first stop for a quick check.

Treat the percentage as a signal to review the text, not as proof of who wrote it.