Purpose
Detect AI Watermarks is a free online text analysis tool, mainly used to detect AI watermarks and invisible characters that may be hidden in text. Users can paste text from sources such as ChatGPT, Claude, Gemini, and others into the input box, scan for hidden Unicode characters, and clean and copy safe text within seconds. The tool also supports selecting image mode to strip EXIF/GPS metadata from images.
Main Capabilities
- Detects more than 26 types of invisible Unicode characters (the FAQ mentions more than 30), including zero-width spaces and others.
- Scans for AI watermarks and hidden characters.
- Provides optional AI review results.
- Supports copying cleaned text to the clipboard.
- Supports uploading .txt files, up to 20,000 characters.
- Image mode supports stripping EXIF/GPS metadata.
- All scans run completely locally in the browser, and text does not leave the current page.
How to Use
- Copy text from ChatGPT, Claude, Gemini, or another source that may contain watermarks.
- Paste it into the input box, or upload a .txt file of up to 20,000 characters.
- Click Analyze, and the scanner checks more than 30 types of invisible Unicode characters in milliseconds.
- View the detected characters, read the optional AI review, and then copy the clean text to the clipboard.
Use Cases
- Clean hidden characters before publishing to avoid CMS errors and layout damage.
- Check papers for academic integrity and invisible AI watermarks before submission.
- Debug API responses, JSON payloads, and database insertion issues caused by invisible characters.
- Clean text before it reaches screen readers and accessibility tools.
- Handle the quality of text content from AI tools.
Limitations
- Official materials do not provide explanations about pricing, specific detection accuracy, or watermark algorithm details.
- Free to use, with no registration or credit card required.
- Scanning is completed locally in the browser, offering relatively high privacy, but specific technical implementation details are not yet provided.
- Image mode only mentions stripping EXIF/GPS metadata and does not describe additional image watermark detection capabilities.
