Chrome ExtensionFLUX.2 Image Prompt Generator
Generate optimized prompts for all FLUX.2 variants — Klein (fastest), Dev (32B open-weight), Pro (production), Flex (max precision), Max (best edits), and Kontext (editing). Up to 10 reference images, 4MP native output, 32K-token prompts, and 92% text-rendering accuracy. Built around the official Subject + Action + Style + Context framework with positive-only phrasing.
Be specific: describe who/what is in the image with details
Quick Palettes
Generated Prompt
Fill in the form and click "Generate" to create an optimized FLUX.2 prompt.
Tip: Be as specific as possible with your subject description. Instead of "a dog," try "a golden retriever puppy with a red bandana."
FLUX.2 Tips
- • FLUX.2 has a single prompt field — NO negative prompts. Use POSITIVE phrasing ("sharp focus" not "no blur")
- • Front-load the subject. Subject + Action + Style + Context. Sweet spot: 30-80 words (up to 32K tokens supported)
- • Text rendering hits ~92% accuracy with text in "quotes", kept short (1-4 words), placed on clear surfaces (signs, covers)
- • Pass HEX codes through directly — "#FF6B35 accent" works as a color directive in FLUX.2
- • Pick the variant: klein for sub-second drafts, dev for open-source, pro for production speed, flex for precision typography, max for edits, kontext for image editing
- • Reference up to 10 images for character/product/style consistency — assign each a clear job
- • Name camera/lens/film stock to control color science and grain (Kodak Portra 400, Cinestill 800T, Hasselblad H6D)
How to Use the Prompt Generator
Pick Variant & Describe Your Vision
Choose your FLUX.2 variant — Klein for sub-second drafts, Pro for production, Flex for precision typography, Max for edits, Kontext for image editing. Pick a use case category, set resolution and color palette, and describe your scene with subject + action + style + context. Front-load the subject.
Generate Your Prompt
Click Generate. The tool builds a 30-80 word brief in flowing prose, quotes any literal text for crisp rendering, passes HEX color codes through directly, names camera/lens/film stock for color science, and converts any exclusions into positive phrasing (FLUX.2 has no negative prompt field).
Copy & Create
Paste into the BFL Playground, BFL API, Replicate, fal.ai, getimg.ai, Cloudflare Workers AI, ComfyUI, or Krea. For typography work, render at 4MP. For multi-reference workflows, upload up to 10 images and reference each by index.
Frequently Asked Questions
What is FLUX.2?
FLUX.2 is Black Forest Labs' next-generation image model family, launched in 2026 to challenge Nano Banana 2, GPT Image 2, and Midjourney. It introduces five variants — pro, flex, dev (32B open-weight), max, and klein (sub-second on consumer hardware) — plus the FLUX Kontext line for image editing. Headline upgrades over FLUX.1: up to 10 reference images per request, 4MP native output, 32K text input tokens, frontier-grade photorealism with real-world lighting and physics, and reliable complex typography for production typography, infographics, memes, and UI mockups.
How does this prompt generator work?
You provide structured inputs — scene, subject, style, composition, lighting, color palette, FLUX.2 variant, generation mode, and any preserve list. Our AI assembles them into a FLUX.2-optimized prompt: Subject + Action + Style + Context structure, front-loaded subject, positive phrasing only (no negatives), quoted short text for typography, and HEX color codes passed through directly.
What's the difference between FLUX.2 variants?
FLUX.2 [klein] — fastest, sub-second generation, Apache 2.0 open-source, runs on consumer hardware. FLUX.2 [dev] — 32B open-weight model on Hugging Face, frontier performance, deploy yourself. FLUX.2 [pro] — production-ready API, state-of-the-art quality at max speed. FLUX.2 [flex] — maximum precision and text rendering, full creative control. FLUX.2 [max] — best editing consistency across tasks. FLUX Kontext — separate editing-focused model for advanced reasoning, style transfer, and identity-locked edits.
How accurate is text rendering in FLUX.2?
FLUX.2 [pro] hits roughly 92% accuracy on complex text layouts and is one of the strongest text-rendering models available. To maximize accuracy: enclose literal text in "quotes," keep it short (1-4 words), place it on clear surfaces (signs, book covers, storefronts, T-shirts), and avoid lengthy sentences or tiny text. For typography-heavy work, pick the [flex] variant.
Why no negative prompts?
FLUX.2 uses a single prompt field — there is no separate negative prompt input. The fix is positive phrasing: instead of "no blur, no distortion, no artifacts," write "tack-sharp focus, clean lines, smooth surfaces." Our generator automatically converts your exclusion list into positive phrasing that FLUX.2 actually understands.
How does multi-reference work?
FLUX.2 accepts up to 10 reference images simultaneously with the best-in-class character, product, and style consistency. For best results, assign each reference a clear role in the prompt: "@Image1 defines the subject. @Image2 defines the style. @Image3 defines the lighting." This works across all variants but is strongest in [pro] and [max].
What resolutions and aspect ratios does FLUX.2 support?
FLUX.2 generates and edits up to 4MP (megapixels) natively while preserving detail and coherence. Any aspect ratio is supported: 1:1, 4:3, 3:4, 4:5, 16:9, 9:16, 21:9, 2:3, 3:2, plus custom dimensions. Output speed scales — [klein] runs sub-second, [pro]/[flex] generate in under 10 seconds.
How long should my prompt be?
FLUX.2 accepts up to 32,000 tokens, but the sweet spot is 30-80 words for most images. Short prompts (10-30 words) work for simple subjects — the model auto-fills details. Long prompts (80+ words) are for complex multi-element scenes with purposeful detail. Our generator targets the 30-80 word range by default and expands when you describe a layered or multi-shot composition.
Can I use HEX color codes?
Yes — FLUX.2 understands HEX codes directly. Your color palette picker passes hex codes through to the prompt as concrete directives ("#FF6B35 as the dominant accent, #0F172A for grounding"). This is the most precise way to control color in FLUX.2.
Is this tool free to use?
Yes. You get 3 free prompt generations per day with no signup required. For unlimited access, sign up for a Promptslove membership which includes all AI tools and 20,000+ premium prompts.
Where can I use the generated prompts?
The prompts are tuned for FLUX.2 across the BFL Playground and BFL API, Replicate, fal.ai, getimg.ai, Cloudflare Workers AI, ComfyUI, and Krea. The [dev] variant is a 32B open-weight model on Hugging Face you can self-host. Prompts also produce strong results on Nano Banana 2, GPT Image 2, Seedream 5, and Midjourney.
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