AI Prompt Generator
Turn a rough idea into a structured prompt that gets a usable answer.
AI Tools
Write better prompts and keep your token bill honest.
37 free tools
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AI Image Prompt Generator
Build detailed image prompts for Midjourney, Stable Diffusion and DALL-E.
MCP Config Generator
Generate MCP server config for Claude Desktop, Claude Code, Cursor, VS Code and Windsurf.
AI Persona Generator
Create a persona for a chatbot or roleplay character, as a prompt or a character card.
AI Writing Pattern Checker
Find the words and habits that make text read as AI-generated, so you can edit them out.
Prompt Injection Checker
Scan untrusted text for prompt injection patterns and hidden characters before a model reads it.
Quantization Size Calculator
See the file size of every GGUF quant of a model, and which ones fit your memory.
GPU VRAM Calculator for LLMs
Work out how much GPU memory a local LLM needs to run or fine-tune.
Function Schema Generator
Write valid tool-calling JSON schemas without hand-editing braces.
Cosine Similarity Calculator
Compare two embedding vectors by cosine similarity, dot product and distance.
Dataset Splitter
Split a dataset into training, validation and test files with a repeatable shuffle.
JSONL Validator
Validate a JSONL file line by line, and check fine-tuning datasets before you upload.
Prompt Analyzer
Score a prompt on the parts that change the answer, and see what is missing.
ChatML Formatter
Convert a conversation into ChatML, Llama 3, Mistral, Gemma or Alpaca prompt templates.
Stable Diffusion PNG Info Reader
Read the prompt, seed and settings saved inside an AI-generated PNG.
Chat Transcript Formatter
Clean up a pasted chat log into a tidy transcript, Q&A pairs, JSON or CSV.
Fine-Tuning Dataset Formatter
Turn question and answer pairs into a JSONL training file for OpenAI, Llama or Gemini.
System Prompt Generator
Build a structured system prompt for a chatbot, assistant or custom GPT.
Text Chunker
Split long documents into overlapping chunks for embeddings and RAG.
LLM Cost Calculator
Work out what an AI feature will cost per call, per day and per month.
OpenAI API Request Builder
Build a chat API request for OpenAI, Claude, Gemini, Groq or Ollama in cURL, Python, JS or PHP.
ChatGPT Custom Instructions Generator
Write both custom instruction boxes, each checked against the 1,500 character limit.
Context Window Calculator
See whether your text fits a model context window, and how much room is left.
Midjourney Parameter Builder
Add aspect ratio, stylize, chaos, style references and more to a Midjourney prompt.
AI Text Cleaner
Strip markdown, smart quotes and invisible characters out of generated text.
Few-Shot Example Builder
Turn input and output pairs into a clean, consistent few-shot prompt block.
Markdown Stripper
Remove markdown from ChatGPT and Claude answers and keep clean plain text.
LLM Model Comparison
Compare GPT, Claude, Gemini, DeepSeek and Llama by price, context and monthly cost.
Prompt Template Builder
Fill a prompt template from spreadsheet rows and get one prompt per row.
AI Image Size Calculator
Find the right resolution for SDXL, FLUX, DALL-E or Midjourney at any aspect ratio.
ChatGPT Export to Markdown
Turn conversations.json from a ChatGPT or Claude export into readable Markdown files.
Fine-Tuning Cost Calculator
Estimate what a fine-tune costs to train and run, and when it pays for itself.
Embedding Cost Calculator
Estimate the cost and vector storage of embedding a document corpus for RAG.
AI Crawler Blocker
Generate robots.txt rules to block GPTBot, ClaudeBot, CCBot and other AI crawlers.
Negative Prompt Generator
Build a Stable Diffusion negative prompt from the problems you keep getting.
Token Counter
Estimate how many tokens your text costs before you send it.
Token to Word Converter
Convert between tokens, words, characters, pages and reading time.
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About these AI tools
Utilities for working with large language models, without sending anything to one. Build and grade prompts, system prompts and personas, check untrusted text for prompt injection, estimate tokens, context windows and API cost, size a local model for your GPU, validate and split fine-tuning datasets, convert chat exports and transcripts, generate MCP and API request code, and control which AI crawlers can read your site. No API key, no model call — every tool runs on what you paste, in your own browser.