How to Remove the Gemini “Nano Banana” Watermark

“Nano Banana” is the nickname for Google’s Gemini image model — the one behind the AI images you create in the Gemini app. Like all Gemini/Imagen output, its images are marked in three separate ways, and you have to deal with each one differently.

The three marks on a Nano Banana image

• The visible sparkle. A small four-point star in the bottom-right corner — painted onto the pixels, so it lifts off cleanly. See removing the Gemini watermark.
• Hidden metadata. C2PA Content Credentials plus a “Made with Google AI” provenance tag inside the file — strip it like any C2PA metadata.
• Invisible SynthID. A watermark baked into the pixels themselves. It’s the stubborn one — read how SynthID works.

How to remove each

Start by checking the image — Unmarkr reads the metadata and tells you what’s there, free. The metadata strips off losslessly; the visible sparkle comes off with the full removal. The invisible SynthID watermark is the only part that needs heavier work, and it gives you a faithful look-alike rather than a byte-identical edit.

Why “just crop the sparkle” isn’t enough

Cropping removes the visible star but leaves both the metadata and the invisible SynthID watermark intact — so the image can still be flagged as AI-made. That surprises a lot of people; here’s why a cleaned image is still detected as AI.