Gemini Image Watermark Detector: Logo, C2PA & SynthID
Every image from Google's Gemini (including the Nano Banana and Nano Banana Pro models) can carry up to three watermarks: the visible sparkle logo in the corner, an invisible C2PA Content Credentials manifest in the file header, and Google DeepMind's SynthID signal hidden in the pixels. This Gemini image watermark detector checks for all three. Visible-logo and C2PA detection run instantly in your browser; SynthID — which only Google's own model can read back — is verified through the official content-provenance checker, and we walk you through it. Upload an image to see exactly what it carries. If it's watermarked, you can clean it in one click — the detector hands straight off to the remover.
What the Gemini Detector Actually Checks
The visible scan uses the same engine that removes the Gemini logo: it looks for the sparkle mark at its known position and reports a match with confidence, so a "detected" result means the logo can actually be removed cleanly. The hidden scan reads the file's bytes for a C2PA manifest — the signed "made with Google AI" credential that Adobe, LinkedIn, TikTok and stock libraries trust. If C2PA is present, the image is provably AI-generated.
If no C2PA is found, that doesn't mean the image is clean: Gemini also applies SynthID, a statistical pattern woven into the pixels that survives screenshots, crops and re-saves. SynthID can only be confirmed by Google's own detector, so the tool opens the official checker for you to confirm — then lets you proceed to clean.
Visible Logo vs C2PA vs SynthID
These are three independent layers. The visible sparkle is pixels you can see and is removed with lossless reverse alpha blending. C2PA is metadata in the header — invisible to you, read instantly by machines, and stripped by re-writing the file. SynthID is invisible and lives in the pixels themselves, so it survives a metadata wipe and needs frequency-domain cleaning. A Gemini image can carry any combination of the three, which is why a single "is it watermarked?" answer needs all three checks.
From Detection to a Clean Image
Detection is only half the job. When the detector finds the visible logo, the "Remove the logo" button takes you to the Gemini image remover, which clears it with no quality loss. When C2PA or SynthID is the issue, you're routed to hidden-watermark removal, which disrupts the SynthID signal in the frequency domain and strips the C2PA manifest in the same pass. Either way the original image quality is preserved.