Describe the image you want to create
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Tips for better results
- - Be specific about style, colors, and mood
- - Include lighting and composition details
- - Use artistic style references like "photorealistic" or "watercolor"
- - For image-to-image, upload multiple reference images for better results
- - Describe how you want to transform all uploaded images
- - If generation fails, try switching to a different model in the dropdown for different results and fewer restrictions
Choose a visual direction with Nano Banana 2.1
An early draft should answer a useful question. On Omni Flash, make still-image concepts, inspect them at thumbnail size and decide which composition deserves another revision.
Ask what this version should test
Subject size, background clutter or color contrast: pick one issue, describe the change and judge the result against that question.
Write a focused revision
Both a new image and a reference-based edit need a prompt. The limit is 20,000 characters, but a draft brief can be concise: name the main subject, the one change and the details to keep.
Use the previous draft as a reference
Upload a draft or other source material as JPEG, PNG or WebP. You can add up to 14 references, each up to 30 MB; identify the starting image and any additional visual cues in the prompt.
Set a useful preview shape
Choose a ratio for the intended thumbnail or layout, then select 1K, 2K or 4K and JPG or PNG. Inspect the downloaded image at its actual display size when assessing readability.
Use image drafts to make concrete choices
Nano Banana 2.1 on Omni Flash is useful for exploring a visual question before committing to a layout. Compare downloaded candidates yourself: which silhouette reads clearly, which background distracts, and which version fits the intended crop?
This page starts with the Nano Banana 2.1 model rather than the separate Nano Banana 2 selection. Fresh controls use 1K, Auto aspect ratio and JPG. Choose another resolution or PNG when the current review requires it; turnaround time can vary.
Change one decision at a time
If the subject is too small, ask for a larger subject before also changing the setting and palette. Check whether other details shifted even when they were meant to stay.
Evaluate the small view
A detailed image can lose its focal point when reduced. Preview the downloaded file at thumbnail size and note whether the main object and contrast still make sense.
Make each draft a deliberate request
Set a budget and a review criterion before submitting another version.
Resolution sets the draft price
Omni Flash uses 2 credits per 1K image, 4 per 2K image and 6 per 4K image. There is no separate fee for reference images.
Keep the comparison fair
Use the same aspect ratio when studying two composition choices. Compare the images manually at the same display size; different crops can hide what actually changed.
Select before preparing the next asset
Download useful JPG or PNG candidates and record why you kept them. If you later use a still with a video model, upload it manually and check that model’s supported inputs first.
Draft prompts with a clear review question
These examples test the visual hierarchy of a thumbnail. Each request produces an image for you to inspect, not an automatic comparison or ranking.
Does the focal object read at small size?
Choose 16:9 and prompt: “A single red enamel mug tipped on its side on a pale gray surface, bold simple silhouette, one soft shadow, empty dark navy area in the upper-right for later text, graphic photographic style, no lettering.” Preview it as a small thumbnail and see whether the mug is immediately recognizable.
Is a simpler background easier to read?
Upload a draft of a yellow tent in a busy forest and write: “Use this tent as the main subject. Replace the dense branches behind it with three broad, softly defined tree shapes; retain the tent’s position and yellow color, no text.” Check whether background simplification helped and whether the tent’s shape changed.
Run a focused draft iteration
Keep the question and the settings visible in your own notes as you review candidates.
Name one uncertainty
Choose text generation for a new idea, or upload a draft for editing. Write the specific change you want and the visual details you will inspect afterward.
Set the cost and canvas
Pick a fixed ratio or Auto, resolution 1K/2K/4K, and JPG/PNG format. Check credits for this request before signing in and submitting it.
Inspect, choose and revise
After completion, download the image and compare it manually with earlier candidates at the same size. Revisit the task in My Creations, and submit a new prompt if another revision is needed.
Questions about drafts and selection
How much does each draft iteration cost?
Every new Nano Banana 2.1 image on Omni Flash is priced by output resolution: 2 credits for 1K, 4 for 2K, or 6 for 4K. References do not add a separate charge.
Can I revise an earlier generated draft?
Download the image, add it as a reference and write the requested change. Supported inputs are JPEG, PNG and WebP, up to 14 images of 30 MB each. Recheck the full result because details outside the requested edit may also change.
Which aspect ratios can I compare drafts in?
All 15 choices are available: auto, 1:1, 2:3, 3:2, 1:4, 4:1, 3:4, 4:3, 4:5, 5:4, 1:8, 8:1, 9:16, 16:9 and 21:9. Keeping a fixed ratio across requests helps you make a manual comparison.
How should I compare thumbnail candidates?
Download the candidates and view them at the same intended display size. Check whether the subject is easy to recognize, the contrast guides attention and enough space remains for your final text. Use these observations to choose the next change.
When should I choose 2K or 4K for a draft?
Use 1K to assess a composition, then choose 2K or 4K for a new generation when you need a larger output. You can upload the selected draft as a reference, but check the new result because details may change. Each request is charged at its selected resolution.
When are draft credits refunded?
A confirmed task failure triggers a refund of the generation credits. A slow response or a temporary inability to retrieve status does not by itself qualify as failure; continue checking the original task.
Test one change in your next draft
Make the subject larger, simplify the setting or reconsider the crop with Nano Banana 2.1, then decide what the image needs next.