SynthID
Google's invisible watermark embedded in images and text generated by their AI models.
SynthID is Google DeepMind's watermarking system for AI-generated content. It modifies pixel intensities (or token distributions for text) in patterns invisible to humans but detectable by Google's verifier. Imagen, Veo, and Gemini-generated content all carry SynthID.
The watermark survives common transformations: JPEG compression, cropping, scaling, color adjustments. That robustness is the point — a fragile watermark would be useless. The verifier uses statistical tests on the modified pixel patterns to recover the signal.
SynthGuard's SynthID disruption layer attacks the synchronization signal the watermark relies on. By introducing controlled noise in the specific frequency and spatial bands SynthID uses, the watermark detection collapses to chance. The image looks identical to humans.
This matters for platforms like Instagram and TikTok that check for SynthID at upload and apply AI labels accordingly.