Free prompt engineering tools for ChatGPT, Claude and Gemini
Start from the job you are trying to do: build a prompt, fix one that isn't working, save tokens and cost, or give the AI the right context. Every tool is free to start and works with ChatGPT, Claude and Gemini.
Save tokens & cost
When prompts get long or pricey. Shorten prompts without losing meaning, and see what you save.
Token Counter
Paste any text and see its token count for GPT, Claude, Gemini, DeepSeek, Llama and more, with context-window use and input cost per model.
Diff & Cost Estimate
Side-by-side visual diffs with precise token counts and real API cost savings estimates.
Token Optimizer
Compress verbose prompts by up to 50%, verified against real token counts, not estimates.
Fix & perfect a prompt
When a prompt isn't working. Find what's wrong, rewrite it, structure it and score it.
Prompt Optimizer
Transform vague brain-dumps into precisely structured, professional prompts. Choose from Coding, Writing, Business, Research or General modes to generate the perfect instruction set for any LLM.
Intelligence Score
Get a 0–100 score measuring your prompt's clarity, specificity, and AI-readiness.
Prompt Debugger
Scan prompts for vague wording, contradictions, and logical traps before production.
Build a prompt
Start from an idea. Describe what you want and get a complete, ready-to-paste prompt.
Prompt Builder
Describe an idea in plain words and get a complete, ready-to-paste prompt for ChatGPT, Claude, Gemini or Cursor.
Prompt Template Generator
Pick a ready-made prompt template, fill in the blanks and copy a finished prompt for ChatGPT, Claude or Gemini.
Turn files & sites into prompts
When you start from a document or website. Pull the relevant parts out of documents, or turn a website's design into a prompt.
Site to Prompt
Turn a website's design into a ready-to-use AI prompt: exact colors, fonts, layout and tech stack for v0, Bolt, Claude or Midjourney.
Document to Prompt
Extract only the relevant data from large PDFs and documents via RAG to slash token usage and eliminate hallucinations in your LLM.
Find a ready-made prompt
Not starting from scratch? Browse prompts that already work, and make them yours.
Which prompt tool do you need?
Each tool does one job. Here is when to reach for each of them.
Token Counter
Use the token counter for Claude, GPT and Gemini to see how many tokens a text uses. It shows counts per model with context-window use and input cost; counts for OpenAI models are exact and the others are estimates.
Prompt Optimizer
Use the prompt optimizer when a prompt is vague or the answers come back generic. It rewrites a rough prompt into a structured one with a role, task, constraints and output format.
Prompt Builder
Use the prompt generator for ChatGPT, Claude and Gemini when you have an idea but no prompt yet. Describe what you want, pick the AI you are writing for, and get a finished prompt with context, instructions and output format.
Diff & Cost Estimate
Use the token cost calculator after you edit a prompt. It compares two versions side by side and shows the token and cost difference, so you know the change saved what you expected.
Intelligence Score
Use the AI prompt checker to check a prompt before you send it. It grades clarity and specificity from 0 to 100 and lists what to improve.
Token Optimizer
Use the token optimizer when a prompt is long or costly. This prompt compressor shortens the wording, then counts the tokens before and after so you can see what you saved.
Site to Prompt
Use the website to prompt tool when you want an AI to recreate a website's look. It measures the rendered page and writes a design prompt for builders like v0 or Bolt, or for image models.
Prompt Formatter
Use the Prompt Formatter when a long prompt or system prompt is a wall of text. It organises the same wording into labelled Markdown, XML or JSON sections.
Document to Prompt
Use the Document to Prompt tool when you start from a PDF, DOCX or text file. It finds only the passages that matter for your question, so you paste less into the prompt.
Prompt Debugger
Use the prompt debugger when an AI ignores part of your instructions or answers inconsistently. It reports vague wording, contradictions and missing constraints, with a suggested fix for each.
Prompt Template Generator
Use the Prompt Template Generator when you want a proven structure. Pick a ready-made template from the cookbook, fill in the blanks and copy a finished prompt.
Prompt tools FAQ
Not sure which tool you need? Tell us what's going on and we'll match you.