About

AI Text Watermark Checker is operated by AI Text Watermark Checker, the operator of aitextwatermarkchecker.com. The site is Unofficial. It is not affiliated with OpenAI, Anthropic, or Google.

The free tools look for hidden characters in text inside your browser. They do not score statistical watermarks such as textGrain, Claude’s watermark, or SynthID-Text.

Last updated: 2026-10-09.