How to upscale low-quality photos using Google’s Nano Banana Pro

What if we told you that you don’t need to spend thousands of rupees on premium upscaling software to fix soft or low-quality photos? Most blurry images aren’t beyond saving. They simply need structured AI restoration instead of aggressive sharpening or heavy creative edits.

With Nano Banana Pro, Google’s advanced on-device AI image enhancement tool, you can restore clarity, texture, and detail while preserving the original person, proportions, and composition of the photo.

If your goal is clean 4K clarity without changing identity or rewriting the image, the difference lies in how you guide Nano Banana Pro. Here’s how to do it properly.

How to upscale images using Gemini Nano Banana Pro

Follow this process carefully inside Nano Banana Pro to ensure the AI enhances the image instead of reimagining it:

Step 1: Upload the original file into Nano Banana Pro

Open Nano Banana Pro and upload the original image file. Avoid pre-sharpening, filtering, or manually enhancing the photo beforehand. Stacking edits before restoration can distort natural detail and reduce AI accuracy. Always begin with the cleanest original version available.

ALSO READ: How to use Google’s new Nano Banana Pro image generator the right way

Step 2: Use a restoration-focused prompt

Nano Banana Pro responds best to clear, structured instructions. Define the task specifically as restoration and upscale. Emphasise preserving identity, facial structure, proportions, and composition.

Avoid vague instructions like “make it better”. Instead, specify natural skin texture, accurate detail recovery, realistic lighting, and a professional photographic finish. The more precise the prompt, the less likely the AI will creatively alter the subject.

The exact prompt to upscale images using Nano Banana Pro

Use the following structured prompt inside Nano Banana Pro:

{
“task”: “image_restoration_upscale”,
“positive_prompt”: “Restore and enhance the provided image. Preserve original identity, facial structure, proportions and composition. High-fidelity photo restoration, ultra-realistic, natural skin texture, accurate details, professional photographic look. 4K output, sharp but natural focus, modern cinematic lighting, subtle volumetric lighting, professional color grading, depth of field, HDR. Shot on Arri Alexa, raw photo aesthetic, masterpiece.”,
“negative_prompt”: “Creative reinterpretation, style change, identity alteration, face reshaping, exaggerated features, cartoonish, painting, illustration, over-sharpening, plastic skin, blur, noise, film grain, jpeg artifacts, distortion, bad anatomy, overexposed, underexposed, washed out colors.”,
“parameters”: {
“steps”: 30,
“cfg_scale”: 6.5,
“denoising_strength”: 0.45,
“upscaler”: “4x_NMKD_Siax_200k”,
“target_resolution”: “4k”
}
}

The key when using Nano Banana Pro is explicitly telling the model what not to change. When you clearly define preservation of identity and structure, the AI focuses on restoring clarity, texture, and resolution rather than modifying the subject.

Used correctly, Nano Banana Pro delivers clean 4K upgrades without the artificial look that often comes from aggressive sharpening or generic AI filters. No expensive third-party upscalers required. Free users get up to 2 image generations a month, while Pro or Ultra tier users get between 20 and 100 image generations.

So, will you use Nano Banana Pro and ditch that image upscaler subscription? Drop a comment to let us know.