Free, fast, private, browser-based tools for prompt engineering, cost estimation, context compression, data formatting and more — no sign-up required.
Explore ToolsCalculate real-time costs for GPT-4o, Claude 3.5, Gemini, etc.
Turn rough instructions into clean, high-performance system prompts
Format datasets ready for fine-tuning
Make AI-generated text sound more natural
Create multi-step reasoning chains
Compress long text to fit model context limits
Basic consistency & factuality simulation
Estimate GPU memory needed for models
Try to recover prompt from AI-generated image (sim)
Test simple agent logic flows
Quickly estimate API costs for popular LLMs
A simple calculator that estimates API usage costs for leading large language models based on current public pricing (input & output tokens).
1. Choose your model
2. Enter number of input and output tokens
3. Click Calculate Cost
Helps developers, startups and researchers forecast expenses, compare providers, and optimize prompt length before running expensive batch jobs.
Transform casual instructions into structured, high-performance system prompts
An AI system prompt generator that transforms raw instructions into structured, efficient prompts for large language models. This free tool enhances prompt engineering by ensuring clarity, conciseness, and effectiveness, leading to better AI responses and improved workflow efficiency.
Enter your raw instructions into the textarea above, then click "Optimize" to generate a refined system prompt. Review and copy the result.
Well-structured system prompts dramatically improve output quality, reduce hallucinations, and save tokens & money in production.
Format JSON for training.
The JSON-to-AI Training Data Converter is a fine-tuning data formatter that restructures JSON datasets into formats suitable for AI model training. This free utility streamlines the preparation of data for fine-tuning LLMs, ensuring compatibility and efficiency in machine learning workflows.
Data formatting is a critical step in AI development, as properly structured data leads to better model performance. Our tool handles various JSON structures, converting them into standardized formats like message arrays, making it indispensable for AI researchers and developers.
Paste your JSON data into the textarea and click 'Convert' to generate the formatted output. The tool will parse the JSON and reorganize it into a training-ready structure. Validate the output for accuracy before using it in your fine-tuning processes.
This client-side tool supports quick iterations, allowing you to experiment with different data structures without server dependencies.
Proper data formatting accelerates the fine-tuning process, reducing errors and improving model accuracy. It's crucial for anyone involved in AI model customization, saving hours of manual work and ensuring data integrity.
As AI fine-tuning becomes more accessible, tools like this free fine-tuning data formatter empower users to create custom models efficiently, fostering innovation in various fields.
Rephrase text.
The AI Plagiarism Check Circumventor is a tool to humanize AI text free of charge, rephrasing generated content to enhance readability and originality. This utility helps make AI outputs sound more natural, aiding in content creation while promoting ethical use of AI.
In content marketing and writing, distinguishing AI-generated text from human writing is important for authenticity. Our tool applies subtle rephrasing techniques to improve flow and variety, without altering meaning.
Input your AI-generated text into the textarea and click 'Rephrase' to receive a humanized version. Review the output to ensure it meets your needs, and adjust as necessary for tone or style.
This browser-based rephraser works instantly and privately, making it easy to integrate into your writing workflow.
Humanizing AI text improves engagement and passes plagiarism checks by adding natural variations. It's valuable for bloggers, marketers, and educators seeking to blend AI efficiency with human touch.
With AI content on the rise, this free tool supports responsible creation, helping users produce unique, high-quality material that resonates with audiences.
Build prompt chain.
The Prompt Chain Builder is an AI prompt chaining tool that allows users to create multi-step workflows for complex AI tasks. This free utility structures sequential prompts to handle intricate queries, enhancing the capabilities of LLMs in chained reasoning.
Prompt chaining is a powerful technique in advanced AI applications, enabling step-by-step processing for better accuracy in tasks like analysis or generation.
Enter individual prompts for each step in the provided textareas, then click 'Build' to assemble the chain. The tool will concatenate them logically for use in your AI interactions.
Start with simple chains and expand to more steps as needed, all processed locally for privacy.
Prompt chaining improves AI output quality for complex problems, breaking them into manageable parts. It's essential for developers building sophisticated AI systems.
This tool facilitates advanced prompt engineering, helping users achieve more reliable and detailed responses from LLMs.
Compress text.
The Context Window Packer is a text compressor for AI that reduces long inputs to fit within LLM context limits. This free tool summarizes or condenses content while preserving key information, optimizing for efficient AI processing.
Context windows define how much text an LLM can handle at once, and exceeding them can lead to errors. Our packer helps manage this constraint effectively.
Paste your long text into the textarea and click 'Compress' to generate a shorter version. Adjust the input for better results if needed.
This client-side compressor ensures quick, private operations suitable for sensitive data.
Compressing text prevents context overflow, enabling full use of LLM capabilities without truncation. It's vital for researchers handling large datasets.
By optimizing inputs, this tool enhances AI workflow efficiency and reduces processing costs.
Check facts (simulation).
The AI Hallucination Fact-Checker is a verify AI facts tool that simulates checking for inaccuracies in LLM outputs. This free utility helps identify potential hallucinations, promoting reliable AI usage in research and content creation.
AI hallucinations occur when models generate false information. Our tool provides a conceptual framework to flag these issues.
Input the AI output text and click 'Check' to run the simulation. Review the results for potential issues.
Use this as a preliminary step before relying on AI-generated facts.
Fact-checking reduces the risk of spreading misinformation, essential for trustworthy AI applications.
This tool supports ethical AI practices by encouraging verification in workflows.
Estimate VRAM.
The LLM Parameter Calculator is a GPU VRAM for LLM calculator that estimates memory requirements for running open-source models. This free tool aids in hardware planning for AI deployments.
Understanding parameter sizes and quantization helps optimize resource allocation in machine learning setups.
Enter the number of parameters and select bit precision, then click 'Calculate' for VRAM estimates.
Use this to compare different model configurations.
Accurate VRAM estimation prevents hardware mismatches, saving time and costs in AI projects.
It's crucial for developers scaling LLMs on local machines.
Extract prompt (simulation).
The AI Image Prompt Extractor is a Midjourney prompt from image tool that simulates extracting generation prompts from images. This free utility helps recreate or analyze AI-generated visuals.
Prompt extraction is useful for understanding image creation parameters in AI art tools.
Upload an image file and click 'Extract' to simulate prompt retrieval.
Review the output for insights into potential generation settings.
Extracting prompts aids in replicating styles or troubleshooting AI image generation.
It's valuable for artists and designers working with tools like Midjourney.
Simulate workflow.
The Agentic Workflow Simulator is an AI agent logic tester that models interactions between AI agents using defined steps. This free tool helps design and test autonomous AI workflows.
Agentic AI involves systems that act independently, and simulation ensures robust logic before deployment.
List workflow steps in the textarea (one per line) and click 'Simulate' to run the logic test.
Iterate on steps to refine agent behaviors.
Simulating workflows identifies flaws early, improving reliability in AI agent systems.
It's essential for developers building multi-agent applications.
Your data never leaves your browser — complete privacy.
Just open and use — zero setup.
Optimized vanilla JS — works even on low-end devices.
Created by and for prompt engineers, developers & researchers.