Following yesterday’s big launch, the Gemini app is adding a “new way to prompt with Nano Banana” by drawing or annotating directly on images. Additionally, SynthID now works on video.
After adding an image to the prompt box, select it to launch a “Mark up” editor. “Sketch” lets you draw, highlight, and point out specific parts of the image, with undo and redo in the top-right corner. The “Text” tool allows you to add prompts directly on the image.
This saves you from having to enter an actual instruction in the prompt box, but Google says “you can always add one if you’d like.” When you upload your first image, you’ll be prompted about this new capability. Prompting Nano Banana by drawing is now available on Android, iOS, and the web.
Meanwhile, the Gemini app is expanding SynthID verification to videos after adding image support in November. This lets you check if a video, including the audio, was created with or edited using Google AI.
After uploading a video that can be up to 100 MB and 90 seconds long, prompt with “Was this generated using Google AI?” or similar. Google will look for SynthID watermarks. The response “gives you context and specifies which segments contain elements generated using Google AI.” For example: “SynthID detected within the audio between 10-20 secs. No SynthID detected in the visuals.”
Video and image verification are rolled out to all Gemini app languages and countries.
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