Do Generator

FLUX Prompt Generator

Build optimized prompts for FLUX.1 Pro, Dev, Schnell, and Kontext models. Control style, camera lens, lighting, composition, guidance, and steps for ComfyUI, fal.ai, Replicate, and Black Forest Labs workflows

FLUX.1 Pro / Dev / Schnell / Kontext Kontext Editing ComfyUI Ready

FLUX Prompt Builder

Build detailed FLUX.1 prompts for generation, ads, product visuals, typography, and Kontext edits.

Lead with the main visual idea, then use the controls below to sharpen the instruction.

Your FLUX Prompt

Copy and paste into ComfyUI, fal.ai, Replicate, or your FLUX workflow.

Configure your options and click "Generate Prompt" to create your FLUX.1 prompt...

Quick Templates

FLUX Prompting Tips

1. Write in natural language. FLUX.1 is trained on dense text-image pairs, so full descriptive sentences outperform keyword soup. Say what the image shows instead of stacking tags.

2. Pick the right model. Pro for flagship API quality, Dev for local high-fidelity generation, Schnell for fast drafts at 4 steps, Kontext for instruction-based edits of an existing image.

3. Phrase positively. Most FLUX samplers ignore negative prompts. Instead of "no clutter", describe what should be there: "clean seamless background with a single subject".

4. Start with guidance 3.5. Guidance 3.5 with 20-28 steps is the FLUX.1 Dev sweet spot. Raise guidance for stricter prompt following; drop steps to 4 with Schnell.

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PromptKit

AI Prompt Manager

Manage your AI prompts on Mac and iOS. Exported .prompt.md files work directly with PromptKit.

Download on App Store

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How This Tool Works

Choose a FLUX.1 model, describe your idea in the creative brief, then tune style, lens, lighting, composition, guidance, and steps. The builder assembles everything into one dense natural-language prompt — the format FLUX.1 responds to best — plus a technical tail with your guidance, step, and format settings. Paste it straight into ComfyUI, fal.ai, Replicate, or the Black Forest Labs API. Everything runs locally in your browser; nothing is uploaded.

FLUX Prompt Generator FAQ

What is FLUX.1?

FLUX.1 is a family of text-to-image models from Black Forest Labs, the team behind Stable Diffusion XL and the original latent diffusion research. It is known for photorealistic quality, strong prompt adherence, and unusually good in-image text rendering.

Which FLUX model should I choose?

Choose FLUX.1 [pro] for the best quality via API, FLUX.1 [dev] for high-fidelity local generation with open weights, FLUX.1 [schnell] for fast Apache-2.0 licensed drafts in about 4 steps, and FLUX.1 Kontext when you want to edit an existing image with written instructions.

Does FLUX support negative prompts?

Most FLUX.1 samplers ignore negative prompts. The field is still included because some wrappers and UIs support it, but the reliable approach is positive phrasing: describe the clean background you want instead of listing what to avoid.

What guidance and steps should I use?

Start at guidance 3.5. Lower values (2.0-3.0) give the model creative latitude; higher values (4.0-5.0) enforce stricter prompt following. For steps, 4 is enough for Schnell, 20-28 is the standard range for Dev, and 40 squeezes out extra refinement.

Is this tool free, and where can I use the prompts?

Yes, the builder is completely free and runs entirely in your browser. The generated prompts work anywhere FLUX.1 is available: ComfyUI, Fal.ai, Replicate, the Black Forest Labs API, and any desktop or web UI built on FLUX.