# MJJ Tools

> Free online tools for converters, math, and developers

Source: https://tools.launchllama.co/products/mjj-tools
Markdown: https://tools.launchllama.co/products/mjj-tools.md
Generated: 2026-11-13T13:24:42.769Z

## Facts

- **Name:** MJJ Tools
- **Tagline:** Free online tools for converters, math, and developers
- **Short description:** Provides 160+ free online calculators, converters, and developer utilities such as JSON formatters and regex testers, all processed privately in the browser without registration.
- **Website:** https://mjj.tools/
- **Categories:** Developer Tools, Productivity, Education
- **Listing type:** community
- **Upvotes on Launch Llama:** 0
- **Listed since:** 2026-11-10
- **Featured (paid) listing:** no

## Full description

MJJ Tools is a collection of free online calculators, converters, and developer utilities. Its categories include Daily Tools, Developer Tool, Math Tool, Academic Tool, Finance Tool, Gaming, Translation, and Security. Users can format JSON, test regular expressions, encode or decode Base64, and generate QR codes directly from a web browser. No account is required to use the tools. A My Favorites list helps users return to frequently used utilities.

## Notes for agents

- Generated on request from live Launch Llama data, so it is always current.
- Human page: https://tools.launchllama.co/products/mjj-tools
- Site overview: https://tools.launchllama.co/llms.txt (long form: https://tools.launchllama.co/llms-full.txt)
- Every listing as markdown: https://tools.launchllama.co/catalog.md
- Search the catalog over MCP (https://tools.launchllama.co/mcp) or REST: https://tools.launchllama.co/developers