Upscaling Prompts: Bigger Without Fake Detail - Nano Banana 2

There are really two things hiding under one word. One is straightforward enlargement: the same image, more pixels, edges smoothed and texture reconstructed plausibly. The other is a generative pass that re-renders the image at higher resolution and, in doing so, decides for itself what all that new surface area contains. The second gives sharper, richer results and is also the one that changes fabric weave, rewrites a distant face, and turns a blur in the background into a small object that was never there.

Which one you want depends entirely on the job. A hero image where nothing is legible at small size benefits from reinterpretation. A picture that has already been approved by somebody does not, because the version they approved is not the version they will get back.

Faces are the first casualty, particularly small ones. A face that reads fine at low resolution is mostly suggestion, and upscaling forces the model to commit to features it was previously implying. The result is often a different person. Crop in and treat the face as its own pass, or accept the change.

Text is the second. Lettering that was already approximate becomes confidently wrong at higher resolution, since more pixels mean more room for convincing nonsense. Repeating text in the upscale prompt rarely fixes it; the reliable route is to add real type afterwards in an editor.