AI Image Detector — Check if a Photo is AI-Generated, Free

How AI image detection works here

Two layers of evidence

• Neural analysis: a Vision Transformer (ViT-S/16) trained on millions of real and AI-generated images looks for the subtle artifacts that generators leave behind — noise patterns, frequency signatures, upscaling traces. It outputs a logit, which is Platt-calibrated into an honest probability.
• Metadata forensics: the file itself is scanned for proof of provenance — C2PA manifests (the emerging signed-provenance standard), Stable Diffusion 'parameters' chunks, ComfyUI workflows, and EXIF/XMP tags naming generators like Midjourney, DALL·E, or Firefly.

The two layers combine asymmetrically by design: hard metadata evidence can only RAISE the score (an embedded SD prompt proves AI generation), while its absence proves nothing — most AI images carry no metadata at all. Camera EXIF is shown as context only, because EXIF is trivially spoofable.

Reading the score

The verdict uses a 65% threshold: above it, the image is 'likely AI-generated'; below, 'likely not'. Treat the score as evidence, not certainty — no detector is perfect, especially as generators improve. Very high scores backed by metadata evidence are the most trustworthy; borderline scores (40-70%) are genuinely uncertain.

The tool shows the calibrated neural score and inference time at the bottom of the evidence panel, so you can see exactly what drove the verdict.

Why run detection locally?

Detection tools that ask you to upload the image create a paradox: you're trying to verify authenticity, and you hand the image to an unknown server. Here the model runs on your device via WebAssembly — the same engine family as our other local-AI tools — so the image under scrutiny never leaves your computer. That also makes it safe to check sensitive or private images.

Credits

Detection model: Detectra v1 by Vontra (MIT), inference pipeline from the Detectra project by ashhart (MIT). The model is downloaded once from Hugging Face and cached in your browser.