Stylometric Screener

Looking for a SynthID detector? This is not one, and nothing in a browser can be. Google's SynthID watermark is applied at token-generation time and can only be verified with Google's private keys, which are not public. Any page claiming to read it is guessing. This tool does two different things instead: statistical stylometry, which measures writing patterns and is a weak screening signal, and a covert Unicode scan, which reliably finds invisible characters that some other watermarking tools inject. A clean covert scan does not rule out SynthID, because SynthID leaves no character trace at all. Measured accuracy is in the footer. Treat every result as evidence, never as proof.