The free AI prompt generator that fits every model.
Top any LLM prompts to steal today
Chain-of-Thought Forced Reasoning
Make the model show its work before answering — dramatic accuracy gain on multi-step problems.
Tree-of-Thoughts Decision Brancher
Explore 3 branches per decision, prune ruthlessly, beat one-shot answers.
Self-Refine — Generate → Critique → Revise (×3)
The single move that makes any output 2× better. Used in agentic systems.
Multi-Persona Expert Council
Simulate 5 experts arguing — get a richer answer than any one expert could produce.
Adversarial Red-Team Audit
Generate the strongest attack on your idea before launching. Find vulnerabilities before users do.
System Prompt Designer
Design a production-grade system prompt with role, rules, refusals, and meta-instructions.
How to write a great any LLM prompt
The same patterns the FixAIPrompt linter checks for, condensed into actionable tips.
Always set a role
Adding "Act as a senior <X>" before any task improves output more than any other single move. Free templates already include this.
Pick the right model render
Same prompt, three formats. The auto-fixer's "Claude / ChatGPT / Gemini" tabs render the corrected prompt in the syntax that model handles best.
Use few-shot for consistency
If you call the prompt repeatedly (e.g. in a script), include 2–5 example input → output pairs. Few-shot is the most reliable consistency-booster.
Constrain length explicitly
"Under 200 words" or "in 3 sentences" beats "be brief". Every modern LLM follows hard numbers better than soft adjectives.
Tell it to ask
Append "If anything is ambiguous, ask before guessing" so the model surfaces ambiguity instead of confidently inventing an answer.
Add anti-patterns
Tell the model what NOT to do: "Do not use the word 'leverage'", "no emojis", "avoid filler phrases like 'in conclusion'". Anti-patterns close the output space.
Why use FixAIPrompt with ChatGPT, Claude, Gemini, Grok, Cursor, and Copilot?
- Free, browser-only, no API key needed
- Auto-rewrites for any LLM's preferred syntax
- 5-metric score (clarity / context / structure / specificity / risk)
- 58 prompt templates with interactive fill-in fields
- Detects 30+ secrets/PII before you paste into any LLM
- Chunks long text to fit any LLM's context window
any LLM prompt FAQ
Answers to the most-asked questions about ChatGPT, Claude, Gemini, Grok, Cursor, and Copilot prompting.
›Is this AI prompt generator actually free?
Yes — every tool on FixAIPrompt is free, browser-only, and works without an API key. There are no usage limits, no signup, and no paywalled features.
›Which LLMs does the prompt generator work with?
Every major LLM. The auto-rewriter has built-in render modes for Claude (XML tags), ChatGPT (markdown headings), Gemini (tight bullets), and a model-agnostic Plain mode that works on Grok, Cursor, Copilot, and any other LLM.
›How is this different from ChatGPT?
We're not an LLM — we're the layer that makes your prompt better before you send it to ChatGPT/Claude/Gemini/Grok. Think Grammarly for AI prompts. The rewriter, lint scoring, secret detector, and chunker all run locally in your browser.
›Do you have an API or SDK?
Not yet — the entire engine runs client-side as TypeScript. There's also a free CLI (`npx fixaiprompt`) you can pipe text through in your terminal.
›How accurate is the multi-metric score?
The score is rule-based, not LLM-judged. It's deterministic — the same prompt always gets the same score. The 5 metrics (clarity, context, structure, specificity, hallucination risk) are weighted from ~20 lint rules. In practice, a 90+ score correlates strongly with high-quality model output.
›Can I use the prompt generator in production?
Yes. The CLI (`npx fixaiprompt`) is built for that. You can pipe prompts through it in CI, in build scripts, or in your own AI pipelines. Returns JSON with --json. Or import the lint/improve functions directly from the repo.