Check if files were made with Claude

The intended use case is to provide a basic verification layer for obvious cases—catching Claude-generated files that haven't been deliberately obscured. Think of it as a transparency tool rather than a tamper-proof system. Here's the practical reality: Claude (and other AI providers) are releasing these checkers because there's growing demand for disclosure and attribution. If you download a chart, image, or document, you want to know whether it was AI-generated. The credential serves that purpose for honest actors—people who download files directly from Claude without manipulating them. The tool is most useful in contexts like: - **Academic or professional integrity**: Catching submitted work that was directly generated by Claude - **Media and journalism**: Verifying sources of images and graphics - **Licensing and rights**: Establishing provenance for commercial work But as the article itself acknowledges (through the previous Q&A you included), it's not a security mechanism. It's designed to work against negligence and casual reuse, not determined deception. Someone who wants to hide AI involvement can strip the metadata trivially. This aligns with how C2PA works in other domains too. A camera manufacturer uses it to prove "this photo came from our camera," not to prevent someone from taking a screenshot. It's useful for the 95% of cases where people are acting in good faith, and it creates a paper trail for legitimate verification. But it doesn't solve the harder problem of detecting AI-generated content that's been deliberately obscured—that's what the separate text watermarking system (still in private preview) is meant to address.

In theory, yes—there are telltale signs. In practice, it's getting much harder. **The visible red flags that *used* to work:** Inconsistent lighting and shadows often indicate AI generation—objects should be illuminated by the same light source and shadows should be consistent. Parallel lines in an image should converge at vanishing points; parallel lines that don't converge may indicate AI generation. Blurry or chaotic backgrounds where signs and text appear warped, or mismatched accessories like missing or duplicated earrings, glasses, or buttons merged into clothing or skin are common AI tells. **The catch:** Some AI images can now be nearly flawless—high-quality models simulate lighting, depth, and detail in ways that closely resemble photography or illustration. In some cases there may be no clear visual clues at all, especially when the image has been edited or enhanced after generation. **What detection actually relies on:** The more sophisticated approach bypasses human eyes. Statistical and frequency-domain anomalies—differences in how pixel values are distributed and patterns in high-frequency components—are invisible to the eye but detectable by AI models trained to identify them. Generative models leave behind subtle fingerprints in local frequency bands, interpolation kernels, and upsampling operations because GANs depend on learned upsampling filters and noise injection processes that systematically differ from natural image statistics. **But there's a problem with detection tools too:** Leading open-source AI image detectors achieve accuracy as low as 50–60% on out-of-distribution generated images—barely better than a coin flip. Detection tools typically return a confidence score but false positives and negatives remain possible. So the honest answer is: casual AI images often have obvious flaws, modern high-end AI images might not, and the technical detection methods that work best are invisible to human inspection but still unreliable enough that they're not foolproof either.