AI image detector by platform
Pinterest AI image detector: the “AI modified” label and the saved Pin
Pinterest labels image Pins as “AI modified” when its systems detect generation or alteration from image metadata and classifiers, but a Pin saved from Pinterest is a re-encoded copy that normally carries none of that metadata, so the label is a platform observation and the original file is what isGenAI needs.
Illustration · PNG file
- Signature + IHDR
- iTXt XML:com.adobe.xmprecord
- tEXt parameters
- tEXt prompt / workflow
- tEXt invokeai_metadata
- eXIf
- caBX C2PA manifest
- IDAT pixels
- IEND
AI source type declared
The file labels itself as AI-made.
IPTC DigitalSourceType such as trainedAlgorithmicMedia is read from XMP and shown with its exact value.
Check an image →What Pinterest strips and adds
In May 2025 Pinterest rolled out “AI modified” labels on image Pins, shown in the corner when a Pin is opened, based on image metadata and machine-learning classifiers, with an appeals process for wrong labels and a “see fewer” control for generative content. Pinterest acknowledged that detection is not always accurate. Pins are resized and re-encoded for delivery and, as widely reported, do not retain EXIF, XMP or manifests.
Pinterest did not publish the exact metadata fields it reads; IPTC and C2PA AI indicators are the obvious candidates.
What isGenAI shows for a saved Pin
The AI image detector reads the file you upload: a C2PA manifest if one survived, the IPTC DigitalSourceType in XMP, AI statements in metadata, saved prompts in the AUTOMATIC1111, ComfyUI and InvokeAI formats, and matching copies by hash and perceptual fingerprint. A platform copy with none of these returns “no evidence found”, and the report says plainly that absence proves nothing about the author.
Treat the “AI modified” label as a classifier output plus metadata, not as a file record; isGenAI does not run a visual classifier and will not reproduce that label from the pixels.
What to do instead
Follow the Pin to its source website; that page may serve the original image with records intact. Download from the source rather than from Pinterest and check that file.
The matching-copy check can tie a saved Pin to an earlier file in isGenAI’s records.
How to check an image from this platform
- Note the platform’s own label or credential icon on the post before you download anything; it does not travel with the file.
- Ask the poster for the original file, or trace the first upload. A platform download is a re-encoded copy on most services.
- Upload what you have to the AI image detector and read the report. A stripped copy returns “no evidence found” honestly.
- Use the matching-copy check: a hash or perceptual fingerprint match can tie the stripped copy to an original that still carried records.
Frequently asked questions
What is Pinterest’s “AI modified” label based on?
Image metadata and machine-learning classifiers, per Pinterest’s May 2025 announcement, with appeals for mistakes. The exact fields are not published.
Does a saved Pin keep metadata?
Pins are re-encoded for delivery and in practice arrive without EXIF, XMP or C2PA records. Download from the source site instead.
Can isGenAI detect AI in a saved Pin?
Only from surviving records or a matching copy. isGenAI does not run a visual classifier, so it will not reproduce Pinterest’s label from pixels.
Does no label mean the Pin is a real photo?
No. Pinterest states detection is not always accurate. Check the source file.
Sources
Where a platform documents its behaviour, the vendor page is linked. Where it does not, the page says the behaviour is reported, not documented.