AI-Modified Image Detector: See Exactly Which Parts of a Photo Are AI

Most AI detectors give one yes or no. GPTOne's free image detector shows which regions of a photo were AI-generated or edited, with a pixel-level heatmap. No signup.

Most AI image checkers give you one flat verdict: AI or real. That is not enough when a photo is mostly real but partly faked. GPTOne's free AI image detector goes further. It scores the whole image and then shows you a pixel-level heatmap of the exact regions that look AI-generated or edited. No signup, no cost. Here is why that matters and how to use it.

Key Takeaways

• "AI-modified" means a real photo with AI edits, like a swapped face or an added object. It is different from a fully AI-generated image, and it is harder to catch.
• A single AI-or-real score misses partial fakes. A region heatmap shows you which part of the photo was changed.
• GPTOne detects both AI-generated and AI-modified images, supports DALL-E, Midjourney, Stable Diffusion and more, and is free with no account.
• Upload limits are simple: up to 2MB, at least 512 pixels on the short side, in JPG, PNG, or WebP.
• Treat the result as a strong signal, not legal proof. For anything high-stakes, verify with more than one method.

What "AI-modified" actually means

There are two very different things people lump together as "fake."

A fully AI-generated image never existed as a real photo. A model like Midjourney or DALL-E painted every pixel from a prompt. An AI-modified image starts as a real photograph and then gets changed with AI: a face swapped in, an object removed, a background replaced, a blemish or a whole person edited out.

The second kind is sneakier. Because most of the image is genuinely real, a detector that only asks "is this photo AI" often says real and moves on. The lie is in the 10% that was changed, and a single score hides it.

Why a heatmap beats a single score

Say someone sends you a used-car photo. The car is real. But the dent on the door was painted out with an AI edit before they listed it. A yes-or-no detector might call the whole image real, because it mostly is.

GPTOne's overlay is built for exactly this. It highlights the specific regions that carry AI or editing artifacts, so you see that the door area lights up while the rest stays clean. That tells you where to look and what to question. You are not left staring at a percentage with no idea what it refers to. This is the same thinking behind our text tool, which highlights the exact sentences that read as AI on the free AI text detector.

How to check an image in under a minute

1. Save the image you want to check to your device.
2. Open the free AI image detector.
3. Upload the file. Keep it under 2MB and at least 512 pixels on the shortest side for a clean read.
4. Read the confidence score, then turn on the overlay to see which regions were flagged.
5. If a specific area lights up, zoom in there and judge it with your own eyes too.

No account, no credit card, no waiting.

What it catches

The detector is tuned for the edits people actually try to pass off as real:

• Face swaps and deepfake faces spliced onto a real body
• Objects added or removed, like a scratch painted out or a person edited away
• AI-replaced or AI-extended backgrounds
• Inpainting, where a chunk of the photo is regenerated to hide or add something
• Fully synthetic images from the major generators

Where a heatmap is genuinely useful

Insurance teams checking claim photos for edited damage. Marketplace buyers checking whether a product shot was cleaned up beyond reality. Journalists verifying a viral image before they publish. Dating app users checking a profile picture. In each case the question is not only "is this fake" but "what part is fake," and that is what the overlay answers.

AI-modified versus deepfake: what is the difference

People use deepfake and AI-modified to mean the same thing, but they are not identical. A deepfake usually means a face or a whole person swapped or synthesized to impersonate someone, often in video. AI-modified is broader: any real image changed with AI, including removing an object, extending a background, or cleaning up a defect. Every deepfake is AI-modified, but not every AI-modified image is a deepfake.

The distinction matters for detection because each edit leaves a different trace. A face swap concentrates its artifacts around the face, jaw, and hairline where the fake was blended in. An object removal leaves a smooth, slightly too-clean patch where pixels were regenerated. A background swap breaks the lighting and edges between the subject and the scene. GPTOne's heatmap helps with all three, because it points you to the region carrying the artifacts instead of asking you to guess. If the overlay lights up around the edges of a face, think swap. If it flags a suspiciously featureless patch, think removal.

The honest limitation

No image detector is perfect, and anyone who claims 100% certainty on a single scan is overselling. Heavy compression, screenshots, and repeated re-saving can wash out the artifacts detectors rely on. Provenance standards like C2PA Content Credentials and Google SynthID help by tagging AI images at creation, but they only work when the generator adds them and the platform keeps them. So use the heatmap as a strong, specific signal, and for anything that really matters, combine it with provenance checks and your own careful look.

FAQ

What is the difference between AI-generated and AI-modified images?

AI-generated means every pixel came from a model with no real source photo. AI-modified means a real photo was edited with AI, like a face swap or a removed object. GPTOne detects both, and the heatmap is most useful for the modified kind.

Can an AI detector show which part of a photo is fake?

Yes. GPTOne overlays a pixel-level heatmap on the image, highlighting the regions that look AI-generated or edited, instead of giving one flat score for the whole picture.

Is the image detector free?

Yes. It is free with no signup, the same as GPTOne's text detector. Upload an image up to 2MB in JPG, PNG, or WebP.

Is a detector result proof an image is fake?

No. Treat it as a strong signal, not legal proof. For high-stakes cases, combine it with content-credential checks and a careful manual review.

Try the free AI image detector, no signup, at gptone.me.