Developer Tools
Essential utilities for web development. Infer Zod from JSON, generate llms.txt, convert OpenAPI into schemas and MCP servers, check agent readiness, write Cursor rules, encode data, and more, all instantly in your browser.
OpenAPI to MCP Server
Convert OpenAPI or Swagger specs into Model Context Protocol servers for Cursor, Claude Desktop, and AI agents. Generate TypeScript or Python projects in your browser. No signup.
llms.txt Generator
Create an llms.txt file for AI crawlers and agents. Curate sections and links, or import URLs from a sitemap XML paste.
OpenAPI to Tool Schemas
Convert OpenAPI or Swagger into Zod validators, JSON Schema, OpenAI function tools, and Anthropic input_schema tools. Perfect for LLM function calling without a full MCP server.
JSON to Zod & Schema
Infer Zod validators and JSON Schema from example JSON. Add optional description/prompt notes for agents and docs. 100% browser-side.
robots.txt Generator
Generate or validate robots.txt with GPTBot, ClaudeBot, Google-Extended, PerplexityBot, and other AI crawlers. Presets for SEO vs training blocks. 100% browser-side.
MCP Tool Checker
Paste MCP tools/list, OpenAI or Anthropic tool schemas, or OpenAPI. Get an agent-readiness score for descriptions, naming, safety, and context size. 100% browser-side.
Prompt Diff
Compare two system prompts, AGENTS.md, CLAUDE.md, or Cursor rules side-by-side. Line or word highlights and unified patch download. 100% browser-side.
Prompt & Rules Linter
Paste a system prompt, AGENTS.md, CLAUDE.md, or Cursor .mdc rule. Score clarity, safety, contradictions, and actionability. Download a markdown report. 100% browser-side.
Cursor Rules Generator
Generate Cursor .cursor/rules .mdc files, AGENTS.md, CLAUDE.md, and legacy .cursorrules from stack presets. Includes MCP-aware extras. Free and private.
Base64 Encoder/Decoder
Encode and decode Base64 strings instantly. Perfect for embedding images, encoding API payloads, or debugging data URIs. Supports both text and file encoding.
Hash Generator
Generate cryptographic hashes for any text. Supports MD5, SHA-1, SHA-256, SHA-512, and more. Essential for password hashing, data integrity checks, and file verification.
UUID Generator
Free UUID generator online: create v4 (random) or v1 (timestamp) GUIDs in bulk. Copy, download, uppercase, no-hyphens, or bracket formats. 100% browser-side.
URL Encoder/Decoder
Encode URLs for safe transmission and decode URL-encoded strings. Essential for working with query parameters, API endpoints, and web development.
Why Developers Love These Tools
Instant Results
No waiting for conversions or generations. Get results immediately as you type.
Client-Side Processing
All processing happens in your browser. Your data never leaves your device.
Always Free
No API keys, no rate limits, no sign-ups. Just tools that work when you need them.
Common Developer Use Cases
Base64 Encoding
- • Embed images in HTML/CSS
- • Encode file uploads for APIs
- • Create data URIs for testing
- • Debug Base64-encoded data
Hash Generation
- • Generate password hashes
- • Verify file integrity (checksum)
- • Create cache keys
- • Generate content signatures
UUID Generation
- • Create database primary keys
- • Generate session IDs
- • Create unique filenames
- • Generate transaction IDs
URL Encoding
- • Encode query parameters safely
- • Build API request URLs
- • Debug URL encoding issues
- • Handle special characters in URLs
Perfect for Any Tech Stack
These tools are language-agnostic and work with any development environment. Whether you're working with JavaScript, Python, Java, Ruby, or any other language, these utilities help you work faster.
Frequently Asked Questions
OpenAPI to MCP vs OpenAPI to Tool Schemas: which do I need?
Use OpenAPI to MCP when you want a full Model Context Protocol server for Cursor or Claude Desktop. Use OpenAPI to Tool Schemas when you only need Zod validators, JSON Schema, or OpenAI/Anthropic function definitions without running an MCP process.
llms.txt vs robots.txt: what's the difference?
robots.txt controls whether crawlers may fetch URLs (Allow/Disallow). llms.txt is an informational map for AI agents describing your best pages. Use our robots.txt Generator for crawler policy and llms.txt Generator for agent discovery.
Do these developer tools upload my data?
No. OpenAPI parsing, MCP codegen, hash/UUID/Base64/URL tools, JSON-to-schema inference, prompt linting, and robots.txt generation all run in JavaScript in your browser. Nothing is sent to Instant Tools servers.
Which hash algorithm should I use?
SHA-256 or SHA-512 for integrity checks today. MD5 and SHA-1 are fine for non-security checksums but not for passwords or signatures.