How many images can I check for free?

The free plan is limited to 4 images per day.

What does the extension detect when C2PA data is missing?

It analyzes the image itself with Pangram Image 1.0 and calculates an "AI-likeness" score, which came out as "High" for a Qwen Image 2.1 image.

Can I sign in without creating an account?

Yes, you can sign in with a Google or Apple account instead of creating a new account.

Image GenerationGIGAZINE AI1h agoNov 8, 2026, 19:01 JST

Pangram AI Detection test: ChatGPT and Qwen Image 2.1 images caught

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3 Key Points

What happened
In a hands-on test, Pangram AI Detection labeled ChatGPT images as "AI Detected" via embedded C2PA data and rated a Qwen Image 2.1 picture "High" for AI-likeness.
Why it matters
The extension correctly caught both generated images, but its maker says results are not guaranteed 100% accurate, so they should be treated as reference information only.

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Context & Analysis

Pangram AI Detection offers two paths for judging an image. When a file carries the C2PA identifier, the extension can treat that metadata as a strong signal, which is how the ChatGPT image was flagged as "AI Detected." For images without that embedded marker, it falls back to analyzing the picture itself with a model called Pangram Image 1.0 and producing an "AI-likeness" score. In the test, a Qwen Image 2.1 picture without C2PA data scored "High," and the extension displayed a heat map that was almost entirely red, suggesting it judged the whole image as AI-like.

The test also covered a genuine camera photo, which was labeled "Likely NO AI" with an all-green heat map. These results suggest the tool can catch both fully generated images and edits made to real photos, though its output is not guaranteed to be 100% correct and should be used as one piece of reference information.

FAQ

How many images can I check for free?: The free plan is limited to 4 images per day.
What does the extension detect when C2PA data is missing?: It analyzes the image itself with Pangram Image 1.0 and calculates an "AI-likeness" score, which came out as "High" for a Qwen Image 2.1 image.
Can I sign in without creating an account?: Yes, you can sign in with a Google or Apple account instead of creating a new account.

GIGAZINE AIRead Original Article

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