Apple is introducing a "Reference Image" feature with the iPhone 18 Pro lineup, launching later this month, designed to prove when a photo has not been altered by AI or other editing tools. The camera's new sensor will "sign every pixel it sees" while in a dedicated Reference mode, with Apple's Private Cloud Compute processing that data into what it calls an "unalterable reference image" viewable in the Photos app, allowing users to compare it against other versions to spot any edits. The move responds to growing concern over increasingly realistic AI-generated images and video, and marks Apple's entry into a field already addressed by standards such as SynthID, C2PA and Meta's Content Seal.

Unlike those existing labelling systems, Apple is embedding the authentication process directly into its hardware via the iPhone 18 Pro and Pro Max's camera sensor. The company is also opening a Reference Image API to developers across iOS, iPadOS and macOS, potentially letting third-party apps display these signed photos in future. However, the feature will not be available at launch in the European Union, though Apple says EU users will still be able to "develop and view" reference images once iOS 27, iPadOS 27 and macOS 27 are released.