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⚡ 100% Client-Side • Zero Cloud Uploads • Instant Execution

AI & Agent Developer Suite

Free, lightning-fast client-side utilities engineered for prompt engineers, AI agent builders, and LLM developers.

AI & LLM Tools

LLM Token Counter & Cost Calculator

Calculate live tokens for GPT-4o, Claude 3.5, Gemini, DeepSeek, and estimate API call costs.
AI & LLM Tools

System Prompt & Agent Studio

Visually architect robust system prompts, negative constraints, and few-shot examples for agents.
AI & LLM Tools

LLM JSON Output Repair & Fixer

Instantly fix broken AI JSON, markdown fences, Python booleans, single quotes, and truncated brackets.
Agent Utilities

MCP & Function Calling Schema Builder

Build Model Context Protocol (MCP) tool schemas, OpenAI function specs, and TypeScript types.
Agent Utilities

RAG Text Splitter & Chunk Visualizer

Visualize document chunking strategies (Recursive, Token, Markdown, Sentence) for vector search.
AI & LLM Tools

Prompt Formatter & ChatML Converter

Convert prompts between OpenAI, Anthropic, ChatML, and Llama 3 with dynamic variable interpolation.
Agent Utilities

llms.txt Generator & Linter

Build and validate standardized /llms.txt and /llms-full.txt files for AI crawler discovery.

Why Client-Side Utilities for AI & Agent Workflows?

As the generative AI and autonomous agent ecosystem expands at breakneck speed, developers and prompt architects face new daily hurdles: predicting token usage, fixing malformed LLM JSON, generating Model Context Protocol (MCP) tool schemas, and visualizing RAG vector chunks.

Sending proprietary prompts, database structures, and system instructions to third-party web tools poses severe security risks. TextTools AI Suite runs 100% locally in your web browser with zero server roundtrips, guaranteeing complete confidentiality and sub-millisecond execution.

Frequently Asked Questions

Are all AI & LLM tools on TextTools 100% free and client-side?

Yes! Every single AI developer tool runs completely in your web browser with zero server roundtrips, no tracking, and no paid API keys required. Your proprietary prompts, system architectures, and API keys remain 100% confidential on your device.

What AI developer utilities are included?

Our suite includes: LLM Prompt Token Counter & Cost Calculator, System Prompt & Agent Persona Studio, LLM JSON Output Repair & Schema Fixer, MCP & Function Calling Schema Generator, RAG Text Splitter & Chunk Visualizer, Prompt Template Formatter & ChatML Converter, and llms.txt Generator & Validator.

Can these tools be used offline?

Yes. After the page initially loads, all tokenizer algorithms, schema builders, heuristic JSON repair engines, and prompt formatters function entirely offline without an active internet connection.