Free AI Image Checkers Compared: Which One to Use

There is no single tool that can tell you, with certainty, whether any image was made by AI. There are, however, several free tools that each answer part of the question well. This guide compares them honestly, including our own, so you can pick the right one for the job.

Tool features change often. What follows is based on what each tool says it does as of October 2026; check the tool's own site before relying on it.

The three kinds of check

• Provenance (Content Credentials / C2PA): reads a signed record inside the file that can say the image was AI-generated. Strongest evidence when present, but often stripped by screenshots and social apps.
• Metadata: reads EXIF, XMP and IPTC fields, such as an AI source label or a generator name. Useful, but easy to edit or remove.
• Pixel detectors: AI models that look at the picture itself. They work even without metadata, but they make mistakes in both directions, especially on new generators and compressed images.

The tools

OriginLens

OriginLens combines all three checks in one page. It reads Content Credentials with the official C2PA library and checks the signature, including AI labels from earlier editing steps (for example, Google's generative AI images that later had a watermark added). It also shows all EXIF/XMP/IPTC/GPS metadata and can remove it without re-encoding. Its pixel check (the open Community Forensics model) is optional and clearly labelled experimental.

• Best for: one place to see every signal, plus removing private metadata before sharing.
• Privacy: runs in your browser; images are not uploaded.
• Limits: one free image check a day without an account (unlimited with a free account). The pixel check misses some AI images, and the signer is not checked against a trusted-issuer list.

Content Credentials Verify (contentcredentials.org/verify)

The official verifier from the Content Authenticity Initiative. It checks whether a file's Content Credentials are valid and shows a readable summary of who signed it and how it was made.

• Best for: the authoritative answer on whether Content Credentials are valid and who issued them.
• Limits: it only helps when the file still has Content Credentials, and it doesn't inspect other metadata or the pixels.

Sightengine C2PA check

Sightengine, a company that sells image-moderation APIs, offers a free in-browser C2PA checker. It also advertises AI and deepfake detection on the pixels through its paid API.

• Best for: a quick C2PA check, and businesses that need detection at scale through an API.
• Limits: pixel detection is part of the commercial product; check their site for current free limits.

Reverse image search (Google Lens, Bing, TinEye)

Not an AI detector, but often the most useful step when a file has no metadata. Finding the earliest copy of an image can lead to the original upload, the generator's gallery, or a fact-check.

• Best for: images that were screenshotted or shared through social apps.
• Limits: your image is sent to the search provider.

Quick comparison

Which one should you use?

1. Start with a tool that reads Content Credentials and metadata, such as OriginLens. If it finds a signed AI label, you have strong evidence.
2. If the label's signer matters (for example, in journalism), confirm it with the official Content Credentials Verify tool.
3. If the file has no metadata, run a reverse image search to find the original.
4. Treat any pixel-detector score as a hint, never a verdict, in either direction.

For the full method, read our guide on how to check if an image is AI-generated.

Frequently asked questions

Which free AI image checker is the most accurate?

For images that still carry Content Credentials, any tool that reads them correctly gives near-certain answers. For images without them, no free tool is reliable: pixel detectors miss new generators and sometimes flag real photos.

Is OriginLens the same as the Origin Lens app?

No. OriginLens (www.originlens.bond) is a separate website, not affiliated with the "Origin Lens" iOS app or research project. See About OriginLens.