c2pa
Anthropic shipped a content checker that cannot tell you if Claude wrote it News
Anthropic launched a free browser-based tool that reads content credentials embedded in files, and the page states plainly that it cannot determine whether Claude was involved in creating the content it checks.
A tool that strips SynthID and C2PA marks passed 4,900 stars and shipped again on August 18 News
An open-source Python tool for removing visible and invisible AI watermarks and provenance metadata from images and video has passed 4,900 GitHub stars and released version 0.27.0, adding C2PA credential validation and coverage for new video provenance formats.
Content provenance and watermarking: how you tell whether a machine made it Lesson
Content provenance and watermarking are the two competing methods for answering 'did an AI make this?' - provenance attaches a signed record of where a file came from, while watermarking hides a statistical signature inside the pixels or word choices themselves. Provenance is robust but strippable; watermarking survives copying but degrades under editing, and neither works on a file that was never marked in the first place.
remove-ai-watermarks Tool
A Python library and CLI that detects and removes visible marks, invisible watermarks such as SynthID, and provenance metadata including C2PA, EXIF, IPTC and XMP from images and video. Useful for defenders auditing how durable their own provenance actually is.
Claude Content Credentials Checker Tool
Free browser tool that reads C2PA content credentials embedded in image, video, and audio files, up to 100 MB across 17 formats. It runs locally and the file never leaves your machine. Important limitation stated on the page itself: it reads the credential only, and cannot tell you whether an AI was involved in creating content that carries no credential.