How to Fix Nano Banana Generative Fill Distortion Using a Smart Object Workflow

Generative Fill with Nano Banana on a large canvas often produces stretched or squashed results with visible selection edges. The problem is a resolution mismatch — the model generates into a small area but gets scaled up to fit a much larger document. A simple Smart Object workaround solves this completely and also delivers sharper output as a bonus.

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Practical Tips

These steps will help you get clean, proportional results from Nano Banana every time you generate into a selection.

• Hold Shift while drawing a Rectangular Marquee selection to constrain it to a perfect square — this prevents the model from distorting the aspect ratio of generated content.
• Copy the selection to a new layer with Ctrl+J (Cmd+J on Mac), then convert it to a Smart Object before generating — this lets you open and edit the content in its own isolated document.
• Generate inside the Smart Object document, not on the main canvas — the smaller native resolution means the AI fills at full quality without stretching.
• Save the Smart Object with Ctrl+S (Cmd+S) to automatically update it in the main document, with no seams and no squashing.
• Give the square selection a little extra room around the target area so generated shadows and edges have space to blend naturally.

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