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LLM Tools

Token counters, JSON extractors, and utilities for working with AI prompts and LLM outputs. Estimate token usage and parse responses.

LLM utilities for developers: token counting, prompt templates, MCP schemas, llms.txt, cost estimates, and chunk splitting. Not an SEO rank checker — use SEO Tools for meta and schema.

Guide: free LLM tools · Token counter · MCP schema · llms.txt generator · Free SEO tools

Popular LLM Tools

Most used tools in this category:

  1. Prompt Token Counter – Count characters, words, and estimate tokens for LLM prompts. Useful for OpenAI, Claude, and other AI APIs.
  2. MCP Tool Schema Generator – Generate Model Context Protocol (MCP) tool definitions. Create name, description, and inputSchema JSON for MCP servers.
  3. llms.txt Generator – Generate llms.txt for your website. Creates AI-readable discovery file with name, summary, contact, and services. Spec 1.1.1 compatible.
  4. Prompt Template Builder – Build prompts with {{variable}} placeholders. Fill in values and preview. For reusable AI prompts.
  5. System Prompt Generator – Generate system prompts for LLMs. Role, task, constraints, output format. For ChatGPT, Claude, etc.
  6. LLM Cost Calculator – Estimate token cost for OpenAI GPT-4, Claude, and other LLM APIs. Input vs output tokens, pricing per model.
  7. Text Chunk Splitter – Split text into chunks for RAG, embeddings, or context windows. By tokens, characters, or sentences. Overlap support.

All LLM Tools

Prompt Token Counter

Count characters, words, and estimate tokens for LLM prompts. Useful for OpenAI, Claude, and other AI APIs.

MCP Tool Schema Generator

Generate Model Context Protocol (MCP) tool definitions. Create name, description, and inputSchema JSON for MCP servers.

llms.txt Generator

Generate llms.txt for your website. Creates AI-readable discovery file with name, summary, contact, and services. Spec 1.1.1 compatible.

Prompt Template Builder

Build prompts with {{variable}} placeholders. Fill in values and preview. For reusable AI prompts.

System Prompt Generator

Generate system prompts for LLMs. Role, task, constraints, output format. For ChatGPT, Claude, etc.

LLM Cost Calculator

Estimate token cost for OpenAI GPT-4, Claude, and other LLM APIs. Input vs output tokens, pricing per model.

Text Chunk Splitter

Split text into chunks for RAG, embeddings, or context windows. By tokens, characters, or sentences. Overlap support.

LLM JSON Extractor

Extract JSON from LLM responses. Parse code blocks and clean malformed JSON from AI output.

MCP Config Formatter

Format and validate MCP server configuration (mcp.json). Pretty-print and check structure for Cursor, Claude, and other MCP clients.

Few-Shot Prompt Builder

Build few-shot prompts with input-output examples. Structure examples for in-context learning.

Prompt Variable Extractor

Extract {{variables}} or {placeholders} from prompt templates. List placeholders for documentation.

API Response Formatter

Format and beautify API responses. JSON, XML. Detect and fix common malformed output from APIs.

AI Image Prompt Builder

Build prompts for Midjourney, DALL-E, and Stable Diffusion. Select style, lighting, mood, camera angle. Copy-ready prompt.

AI Text Detector

Detect AI-generated text with heuristic analysis. Sentence uniformity, vocabulary diversity, AI phrase patterns. No API needed.

AI Model Comparison

Compare AI models: GPT-4o, Claude, Gemini, Llama, Mistral. Context window, pricing, features. Interactive table.

README Generator

Generate GitHub README.md from project info. Badges, install steps, usage, license. Markdown output.

Custom GPT Instructions Builder

Build system instructions for OpenAI Custom GPTs. Role, tone, rules, output format. Copy-ready instructions.

AI Tone Analyzer

Analyze text tone and writing style. Formality, sentiment, readability scores. Flesch-Kincaid and Gunning Fog index.

AI Prompt Scorer

Rate your prompt quality 0-100. Clarity, specificity, structure, context analysis. Get improvement suggestions.

Commit Message Generator

Generate Conventional Commits messages. Type, scope, description, breaking changes. feat, fix, refactor formats.

Changelog Generator

Generate CHANGELOG.md entries. Added, Changed, Fixed, Removed sections. Keep a Changelog format.

Fine-tuning Data Formatter

Format training data for OpenAI fine-tuning. CSV or JSON to JSONL. System/User/Assistant roles. Validate and preview.

AI Chat Export Formatter

Convert ChatGPT JSON exports to readable Markdown. Format AI conversations for sharing and documentation.

AI Persona Generator

Generate detailed AI personas and character prompts. Profession, personality, tone, expertise. For Custom GPTs and roleplay.

Prompt Injection Scanner

Scan text for prompt injection patterns. Detect instruction override, role hijack, system prompt extraction attempts.

Embeddings Cost Calculator

Calculate embedding API costs. OpenAI, Cohere, Voyage models. Token count, dimensions, storage estimates.

AI Prompt Chain Builder

Build multi-step prompt workflows. Chain prompts with variable passing between steps. For complex AI tasks.

Frequently Asked Questions

What are LLM Tools tools?
LLM Tools tools are free online utilities that run in your browser. They help developers and content creators work faster—no installation, no account, and your data stays on your device. Use any tool instantly from desktop or mobile.
Are LLM Tools tools free?
Yes. All LLM Tools tools on everytools are completely free. No signup, no subscription, no limits. Use them as often as you need.
How do I use LLM Tools tools?
Open any tool on this page, paste or enter your input in the field, and view the result. Most tools update in real time. Click Copy to copy output to your clipboard. All processing happens in your browser—your data never leaves your device.
Do I need to install anything for LLM Tools tools?
No. All LLM Tools tools run in your web browser. No downloads, no plugins, no installation. Works on desktop and mobile.