Claude 上线文件检测工具，可查验文件是否由 Claude 生成

Check files

AI 导读

Claude 推出文件检测工具，通过检查文件元数据中的 Content Credential 判断文件是否由 Claude 生成或处理。该凭证是采用 C2PA 开放行业标准的加密签名信息，支持 .png、.jpg、.svg 等格式；检测只读取凭证，文件不上传存储。文本检测则通过 Detection API 进行，目前按欧盟法律要求处于面向合格机构的私测阶段。

推荐理由

官方说明了文件检测工具的原理和隐私边界，读者可据此了解 Claude 内容凭证机制如何工作。

正文 · 原文

Check if a file was made with Claude

What the tool does

The tool checks a file for a Content Credential from Claude. If it finds one, that tells you Claude may have made or processed the file. It doesn't tell you who authored the underlying content, and it carries no identifying information about the user.

The tool does not check text. Claude marks text with a watermark in the writing itself. Find details on text detection here (opens in new tab).

How it works

When Claude produces a supported file type (such as a .png, .jpg, or .svg), it attaches a Content Credential in the form of a small, cryptographically signed note in the file’s metadata, saying that the file may have been made or processed with Claude.

This is an open industry standard called C2PA—the same used by camera manufacturers and in photo-editing software to record where an image came from. Any C2PA-aware tool can read it.

If we find one that points to Claude, we'll tell you here.

How can I tell if Claude wrote a piece of text?

Text is checked through a Detection API, which is currently in private preview for eligible organizations as required under EU law.

Read more about file and text detection here (opens in new tab).

What happens to the file you upload

Your file stays on your device.
The checker only reads the attached credential, not the file itself.
Your file is never stored or used for any other purpose.