How we verified this
We don’t run generation tests, we read the fine print. For Nano Banana (Google Gemini 2.5 Flash Image) we read the free tier’s own terms, its commercial-use, watermark and attribution rules, then confirmed the cheapest plan that lifts them against the official pricing page, cross-checked across multiple current sources. The watermark and license clauses below are paraphrased from those terms, and the quality score is our editorial read of the tool, not a lab benchmark. Everything here was last verified September 5, 2026.
Watermark & licensing, the part that decides monetization
Why the free plan fails: Two different 'free' paths with opposite rules. The Gemini consumer app / AI Studio UI is free and Google's main Terms of Service say 'Your content remains yours', so you keep ownership and can monetize outputs. BUT the Gemini API free tier is a different beast: Google's API terms say the unpaid tier is 'for developers building... for professional or business purposes, not for consumer use,' Google trains on your free-tier prompts/outputs, and the pricing page lists NO free tier for the image model (image gen is paid-only on the API). Every Gemini-generated image also carries an invisible SynthID watermark. None of this blocks YouTube monetization of an image you made in the app, but the API free tier is not a clean commercial path, hence safeOnFree:false until you understand which door you walked through.
Watermark
No visible/printed watermark on outputs. However Google DeepMind confirms 'SynthID adds an invisible digital watermark to an AI-generated image,' embedded across Google's generative AI consumer products. It does not change image quality and does not block monetization, but it does mean the image is detectably AI-generated.
License
There is no Nano-Banana-specific license. Ownership flows from Google's main Terms of Service, which state users retain IP rights in their content; the user grants Google a worldwide, non-exclusive, royalty-free license to operate/improve/promote services. The dedicated Generative AI Additional Terms do not separately address output ownership or commercial use. On the Gemini API, the unpaid (free) tier additionally lets Google use your content to improve products and is scoped to non-consumer developer use.
“Your content remains yours, which means that you retain any intellectual property rights that you have in your content.”
Pros & cons
Pros
- Google's main Terms of Service explicitly state 'Your content remains yours', clear ownership
- Free to use in the Gemini app and AI Studio UI with no visible watermark
- No attribution requirement for app-generated images
- Top-tier model quality for character consistency and image editing
- Paid API is cheap and transparent at $0.039 per image
Cons
- Two 'free' paths with opposite rules, easy to assume the API free tier is safe when it is not
- Gemini API free tier: Google trains on your prompts/outputs and it's scoped to 'professional or business purposes, not for consumer use'
- Pricing page lists NO free tier for the image model on the API, image generation is paid-only there
- Every output carries an invisible SynthID watermark (disclosure, not a block)
- API Clients serving users in the EU/UK/Switzerland must use Paid Services regardless of tier
- Generative-AI-specific ownership/commercial terms aren't spelled out on the dedicated GenAI terms page; ownership relies on the general Google ToS
Pricing, which plans are actually safe
| Plan | Price | What you get | Monetization |
|---|---|---|---|
| Gemini app / AI Studio UI (free) | $0 | Free image generation; outputs owned by you per Google ToS; invisible SynthID watermark; commercial use permitted | Safe |
| Gemini API, free (unpaid) tier | $0 | No free tier for the 2.5 Flash Image model per pricing page (shows 'Not available'); for text, Google trains on your data and tier is scoped to non-consumer dev use | Not safe |
| Gemini API, paid (Gemini 2.5 Flash Image) | $0.039 per image (1024x1024, 1290 tokens; $30 per 1M output tokens) | Image generation; Google does not train on your prompts/responses on paid tier | Safe |
Affiliate link, commission costs you nothing and never changes a verdict.
Alternatives we’ve tested
Midjourney8.4
AI image · No free tier, paid-only
There is no free tier at all, Midjourney ended free trials in April 2023, so you must pay before you can generate or monetize anything.
FLUX (Black Forest Labs)8.5
AI image · Top open-weights image models, but a two-license split decides whether you can sell the output
FLUX ships as multiple variants with different licenses. FLUX.1 [schnell] is Apache-2.0 and fully clean for commercial use. FLUX.1 [dev] is under a non-commercial model license: you cannot use the dev model itself in revenue-generating activity, even though its license explicitly lets you use the generated images commercially. Running dev on a random free playground for monetized work means relying on that host's license, not your own.
DALL-E / GPT Image (OpenAI)8.0
AI image · OpenAI assigns you ownership of outputs; the catch is access, not rights
OpenAI's terms are unusually favorable on rights: they assign you all of their right, title, and interest in the Output, and you may use it commercially subject to the usage policies. This still sits in the risk index because of access, not licensing. There is no real standalone free tier: image generation comes through ChatGPT (free users get a few rate-limited images per day) or the paid API, and the DALL-E brand is being retired in favor of GPT Image.
FAQ
Can I use Nano Banana images on a monetized YouTube channel for free?
Yes, if you generate them in the free Gemini app or AI Studio UI. Google's Terms of Service say 'Your content remains yours,' so you keep ownership and can monetize. There's no visible watermark and no attribution requirement.
Is there a catch with the free tier?
The catch is which 'free' you use. The Gemini app is fine. The Gemini API free tier is different: Google trains on your free-tier data, it's scoped to non-consumer developer use, and the pricing page shows no free tier for the image model at all, image generation on the API is paid-only ($0.039/image).
Do Nano Banana images have a watermark?
No visible watermark, but Google DeepMind confirms every Gemini-generated image carries an invisible SynthID watermark. It won't block monetization, but the image is detectably AI-made.
Who owns the images I generate?
You do. Google's main Terms of Service state you retain the intellectual property rights in your content. Note the generative-AI-specific terms page doesn't restate this, so ownership rests on the general ToS.