From words to a picture
Describe a scene, a style and a mood, and the generator draws it: an illustration for a post, a background for a slide, a concept for a logo, a watercolor of your street. Be specific about the subject, setting, style and light; English prompts give the most faithful results.
Credits and safety
Each image costs about 2 credits; a free account gets 50 a month. Prompts are checked by a safety model, and sexual, violent, hateful or otherwise harmful requests are refused.
Private
Your prompt is sent over HTTPS to the AI models on Cloudflare's network. UtilNest doesn't store prompts or images, and the AI gateway keeps no logs of them.
How this works
A safety model (Llama Guard 3) checks the prompt first. Then FLUX.1 schnell, an open text-to-image model by Black Forest Labs running on Cloudflare Workers AI, turns the description into a 1024 × 1024 JPEG in four diffusion steps.
Frequently asked
Can I use the images commercially?
FLUX.1 schnell is released under the Apache 2.0 license, which allows commercial use of what it generates. You are responsible for not infringing trademarks or people's likeness.
Is it free?
With a free account: 50 credits a month, about 25 images. Plus and Pro include more credits, and packs top them up.
Why was my prompt refused?
The generator doesn't make sexual, violent, hateful or otherwise harmful images. A refusal by the safety check costs a fraction of a credit.
Is my prompt private?
Your prompt is sent over HTTPS to the AI models on Cloudflare's network. UtilNest doesn't store prompts or images, and the AI gateway keeps no logs of them.
Sources
- Cloudflare Workers AI — FLUX.1 [schnell] by Black Forest Labs (model card, Apache 2.0)
- Cloudflare Workers AI — Llama Guard 3 8B (safety classifier, hazard categories S1–S14)
- Cloudflare Workers AI — Pricing (per-model unit prices and neurons)
Reviewed Oct 19, 2026 · test vectors fixtures/tools/image/ai-image-generator/