Paste a rough prompt. Get back a professional, structured version with an explanation of what changed. Works for ChatGPT, Claude, Midjourney, FLUX, DALL-E, Sora, and more.
⌘/Ctrl + Enter to optimize
A prompt optimizeris a tool that rewrites a rough or vague AI prompt into a professional, structured version — typically adding the missing subject, style, camera, lighting, composition, and mood layers for image prompts, or role, context, task, constraints, and output format for text prompts. PromptSpace's free optimizer runs on Cloudflare Workers AI (Llama 3.3 70B), tailors output to your target model (ChatGPT, Midjourney, FLUX, Claude, DALL-E, Sora), and returns both the improved prompt and a bullet-list of what changed. Last updated September 30, 2026.
The single biggest reason people are disappointed by ChatGPT, Midjourney or FLUX is not the model — it is the prompt. "Make a cool photo of a car" is a wish, not a brief. Professional prompt engineers layer seven structural elements onto every image prompt (subject, style, camera, lens, lighting, composition, mood) and five onto every text prompt (role, context, task, constraints, format). Miss any one and output quality drops 40-60%.
This tool automates that structure. Paste anything — even a fragment — and Llama 3.3 70B rewrites it with all seven layers explicitly present. It returns not just the optimized prompt but a breakdown of what changed and why, so over time you learn the craft rather than depending on the tool forever.
Target-specific syntax. Midjourney reads keyword-comma lists, not sentences. DALL-E rewrites your prompt internally. FLUX loves camera specs. Stable Diffusion needs a separate negative prompt. Generic AI advice ignores this — we tailor per model.
Structure breakdown. Every rewrite ships with a bullet list of exactly which layers were added (lighting? composition? camera? mood?) so you can copy the pattern manually next time.
No signup, no rate-limit paywall. Free forever on the Cloudflare Workers AI free tier. Real 20/hour per-IP limit only kicks in on aggressive abuse.
Instant. 3-8 seconds per rewrite. No queue, no "plus tier only" friction.
Yes. No signup, no credit card, no watermarks. It runs on Cloudflare Workers AI's free tier (Llama 3.3 70B). We rate-limit at 20 optimizations per hour per IP to prevent abuse — more than enough for real use.
ChatGPT (GPT-4o), Claude (Anthropic), Gemini (Google), Midjourney v6/v7, FLUX.1, Stable Diffusion / SDXL, DALL-E 3, Sora, and Runway Gen-3. Pick your target from the dropdown and the optimizer tailors output to that model's syntax.
For image prompts it adds the missing subject, style, camera/lens, lighting direction, composition, mood, and quality cues. For text prompts it adds role, context, task, constraints, and output format. Every rewrite ships with 3-6 bullet points explaining exactly what changed.
The optimized prompt text itself is yours — do anything with it. Commercial use of the AI-generated output depends on the model you send it to (ChatGPT, Midjourney, etc.) — check each provider's terms.
Llama 3.3 70B Instruct (fp8-fast quantization) via Cloudflare Workers AI. Same model class as leading closed-source LLMs, but ~1/50th the inference cost. Response time is 3-8 seconds.
No. Prompts pass through the Cloudflare Workers AI inference API to generate the optimization, then are discarded. We do not log, store, or train on your prompts.
Last updated September 30, 2026 · Built by PromptSpace · Powered by Cloudflare Workers AI (Llama 3.3 70B)