Free tools

MCP Config Generator

Generate the exact command or .mcp.json snippet to connect your AI coding agent to a shared room. Claude Code, Cursor, Codex, or any MCP client.

AI Agent Collision Risk Calculator

Estimate how often your team's AI coding agents are likely to collide on shared interfaces each week. Free, transparent, research-anchored.

LLM Token Counter & Cost Estimator

Count tokens in any prompt and estimate the cost across GPT, Claude, and Gemini models. Paste your text, pick a model, see tokens and price.

AGENTS.md & .cursorrules Generator

Build an AGENTS.md or .cursorrules file from a few prompts so Claude Code, Cursor, and Codex follow your project's conventions. Copy and commit.

.mcp.json Validator & Formatter

Validate and pretty-print your .mcp.json. Catch malformed MCP server configs, missing fields, and JSON errors before your agent fails to start.

Claude Code Hooks Generator

Generate a Claude Code settings.json hooks block (PreToolUse, PostToolUse, UserPromptSubmit, Stop) without hand-writing JSON. Copy and paste.

System Prompt Formatter

Clean up and structure a messy system prompt: normalize whitespace, count tokens and characters, and format it into clear sections.

JSON Formatter & Validator

Format, validate, and minify JSON in your browser. Pretty-print with custom indentation, catch syntax errors with line numbers, and copy the result.

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text, instantly and in your browser. Handles UTF-8 and URL-safe Base64.

JWT Decoder

Decode a JSON Web Token to read its header and payload, and see the expiry in plain English. Everything stays in your browser, nothing is sent.

UUID Generator

Generate v4 (random) and v7 (time-ordered) UUIDs, one or many at a time, with copy and bulk export. Cryptographically random in your browser.

Hash Generator (SHA-256, SHA-1, SHA-512)

Generate SHA-256, SHA-1, and SHA-512 hashes of any text using the Web Crypto API. Fast, local, and copyable.

URL Encoder / Decoder

Percent-encode or decode URLs and query string components. Encode unsafe characters or decode an escaped URL back to readable text.

Unix Timestamp Converter

Convert Unix epoch timestamps to human dates and back, in your local time and UTC. Handles seconds and milliseconds.

Regex Tester

Test a regular expression against your text in real time, with flags, capture groups, and highlighted matches. JavaScript regex engine.

Text Diff Checker

Compare two blocks of text and see what changed, line by line, added and removed. Paste two versions and spot the difference.

Cron Expression Explainer

Paste a cron expression and read what it means in plain English, plus the next run times. Build and sanity-check schedules without guessing.

CSV to JSON Converter

Convert CSV to JSON (and JSON back to CSV) in your browser. Header detection, delimiter options, and pretty output. Nothing is uploaded.

YAML to JSON Converter

Convert YAML to JSON and JSON to YAML instantly. Great for config files, GitHub Actions, Kubernetes, and docker-compose. Runs locally.

Markdown to HTML

Convert Markdown to clean HTML with a live preview. Paste your Markdown, see it rendered, and copy the HTML. GitHub-flavored.

Image Converter (PNG, JPG, WebP)

Convert images between PNG, JPG, and WebP right in your browser, with a quality slider. Your images never leave your device.

QR Code Generator

Generate a QR code from any text or URL and download it as PNG or SVG. Free, no signup, generated in your browser.

.gitignore Generator

Build a .gitignore from common stacks (Node, Python, macOS, Next.js, and more). Pick your stacks, copy the file, commit it.