MJJ Tools

MJJ Tools is a free collection of 160+ online calculators, converters, generators, and browser utilities. Its catalog covers developer, math, finance, translation, academic, text, security, image conversion, SEO, gaming, and everyday tasks. Developer utilities include JSON formatting and validation, Base64 encoding and decoding, regular expression testing, UUID generation, and data conversion. Other tools support calculations, text processing, and everyday conversions. Choose a tool, enter the relevant input, and use the result directly in the browser. No registration or download is required. Most processing runs locally in the browser, with a focus on privacy and ease of use. You can open a tool without creating an account. MJJ Tools is available on the web, so there is no desktop application to install. The tools are free to use. Most tools process input in the browser; refer to the individual tool instructions for its behavior.