ChatGPT Watermark is an online text watermark detection and removal tool, primarily aimed at users who need to check or clean up ChatGPT-generated text.
Purpose
The tool is used to detect whether a so-called "ChatGPT watermark" exists in text and provides a removal function. According to the official description, the ChatGPT watermark is divided into two categories: first, the statistical-level watermark, that is, the preference pattern imposed by the model on word choice when generating text, for which only OpenAI holds the interpretation key; second, the mechanical-level watermark, that is, the invisible Unicode characters carried when text is copied, mainly narrow no-break spaces and the like. Neither is visible on screen, and both spread along with copy and paste.
Main Capabilities
The detection function runs three scans simultaneously and reports the results separately:
- Invisible watermark: that is, the statistical watermark layer. Reading this layer requires OpenAI's key, so the scan reports this layer as unreadable rather than making guesses.
- Hidden characters: detects Unicode characters such as narrow no-break spaces and zero-width joiners, counts them, and displays the specific types.
- AI writing patterns: gives a real detection score and marks the specific sentences that were flagged. The official description states that this detector may produce false positives for formal writing styles and should be regarded as a signal.
The tool also includes a plagiarism check function, which can compare the text against indexed web pages, papers, and publications, and display each instance of overlap and its source.
The removal function is divided into two steps: one-click clearing of the invisible character layer (without changing any visible text), and sentence-by-sentence rewriting to break the statistical pattern (preserving facts and data).
How to Use
Users do not need to log in and can simply paste their draft to scan it. The three tools share the same text, so there is no need to paste repeatedly. The officially stated number of free uses per day is 20.
For Word documents, the official description states that pasting into the document does not clear anything; invisible characters enter the file along with the paste, and Word does not display these characters by default. If only Unicode marks need to be cleared, the official description says it takes about one minute. Docs and Pages do not have an equivalent invisible character search function, so it is recommended to process the text through the scanner and then paste the clean version back.
If no tool is used, the officially provided manual checking method is to paste the text into a plain text editor and enable the display of invisible characters, but this method can only catch Unicode marks and cannot detect statistical patterns.
Applicable Scenarios
Suitable for users who need to check whether a draft carries a ChatGPT watermark, clean up hiddencharacters in copied text, check AI writing patterns, or perform plagiarism comparison.
Limitations
The statistical watermark itself cannot be detected by this tool, because reading it requires OpenAI's key. The AI detector may produce false positives for formal writing styles. The official description clearly states that removing the watermark requires rewriting sentences; merely clearing invisible characters is not enough to break the statistical pattern. Regarding file format support, specific figures for detection accuracy, and other charging situations besides the 20 free runs per day, the materials do not currently provide this.
