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Is that Video AI? Gemini Can Now Help You Figure It Out - but There's a Catch

Gemini's Nano Banana tool enables direct image markup for edits and extends SynthID AI watermark verification to videos up to 90 seconds, enhancing media authenticity checks.

  • Yesterday, Google updated the Gemini app to add Nano Banana visual prompting so users can draw or annotate directly on images across Android, iOS and the web, and extended SynthID verification to videos up to 100MB.
  • The update aims to make AI interactions more natural by moving from text-heavy prompts to visual inputs, as AI image editing has matured to handle tasks once done in Photoshop, Google says.
  • After uploading an image, users can open a Mark up editor to sketch, highlight, or place written prompts using the Text tool, Sketch/Scribble tool, and undo/redo controls.
  • Gemini will scan both visuals and audio for SynthID and indicates which segments contain Google AI elements, helping users verify AI-generated content.
  • Spotted by Android Authority, the tools were quietly added and may still be in testing; SynthID covers Google-made media but some watermarks can be scrubbed and tagging gaps remain.
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Lifehacker broke the news in on Thursday, December 18, 2025.
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