Best AI Image Detectors

Hive has the best independent track record of any AI image classifier. In a 2024 University of Chicago study that tested five automated detectors and thousands of human judges on human and AI art, Hive and expert artists performed best, though they made different kinds of mistakes. The authors concluded that a mix of human and automated checks works best.

Hive checks images, video, audio and music, returns a confidence score, and tries to name which generator produced the content. Its free Chrome extension lets you right-click any image to check it, with no login. The US Department of Defense has also partnered with Hive on synthetic-media detection.

It is still a classifier, so it can be wrong on heavily edited images or brand-new generators, and API pricing requires contacting sales.

Pick it if you check images often and want the most proven classifier. Skip it if you need published per-image API prices without talking to sales.

SynthID is Google's invisible watermark. It is added to images from Gemini, Imagen and Nano Banana, and Google says more than 20 billion pieces of content have carried it since 2023. Since 20 November 2025 you can upload an image to the Gemini app and ask whether it was made with Google AI. Because it looks for a specific hidden signal rather than guessing, a positive result is very reliable.

The limit is scope. SynthID only knows about Google's own tools. An image from Midjourney or an open-source model will come back as "no SynthID found", which does not mean it is real. Google says it plans to expand checks to video and audio and to read other companies' Content Credentials.

Pick it if you suspect an image came from Gemini or Nano Banana. Skip it if you need a general answer about any image; pair it with Hive or AI or Not.

AI or Not is the easiest way for an individual to check images cheaply. The free plan includes 20 image checks, and the $5 Pro plan adds monthly credits that work across images, video, voice, music, deepfakes and text. An API key comes with every plan.

Its accuracy evidence is middling. The tool, earlier branded Optic, was among the automated detectors in the 2024 University of Chicago study of AI art, where Hive performed better. We found no recent large independent test showing it matches Hive.

Pick it if you want a low-cost, multi-format checker for occasional use. Skip it if you are making a high-stakes call; get a second opinion from Hive or a provenance check.

Sightengine is a content-moderation API that includes AI-image detection. Its big advantage is clear, public pricing: 2,000 free operations a month, then $29 for 10,000 or $99 for 40,000, with overage at $0.002 each. That makes it simple to build into a website or app that handles user uploads.

We found no large recent independent study that isolates its AI-image accuracy, so we score that cautiously. Sightengine does publish documentation on how its models work and what they return, which helps developers set sensible thresholds.

Pick it if you run a platform and need automated checks at scale with predictable costs. Skip it if you just want to check a few images by hand; use Hive's extension or AI or Not.

Content Credentials are a signed record attached to an image, a bit like a tamper-evident label. They can show which app or camera made it, whether AI was used, and what edits followed. The free Verify site from the Content Authenticity Initiative reads that record. Google added Content Credentials to Nano Banana Pro images in November 2025, and many other AI tools and camera makers use them.

When a credential is present and valid, it is much stronger evidence than any classifier's guess. The problem is that credentials are easily lost: a screenshot, a re-save or an upload to a platform that strips metadata removes them. A missing credential therefore tells you nothing either way.

Pick it if you want to check an image's origin quickly and for free. Skip it if the image came from social media, where credentials are often stripped; use a classifier as well.

Pangram is best known as the most accurate AI text detector in independent testing, and it now includes image detection even on its free plan. For a teacher or editor already checking essays or articles in Pangram, adding images in the same tool is convenient.

But its strong independent evidence is for text, not images. We found no third-party study of its image detector, so we score it cautiously until one appears.

Pick it if you already use Pangram for text and want one tool for both. Skip it if images are your main concern; Hive has stronger evidence.

Winston AI adds image detection to its text-detection service, so you can check an article and its pictures together and export a PDF report. That is handy for schools or small publishers that want one record.

We could not find independent testing of its image detector, and its accuracy numbers come from the vendor. The free trial lasts only 14 days, after which plans start at $18 a month at list price.

Pick it if you want text and image checks in one simple report. Skip it if accuracy on images is what matters most.