Free online tools
MultiKit is a collection of free browser-based tools. Every tool comes with instructions, worked examples, the method behind it and answers to common questions.
Developer
Design
Text
Why MultiKit
Explained, not just a text box
Every tool comes with instructions, worked examples, how the result is calculated, sources and answers to common questions.
Private by design
Tools run in your browser. What you type, paste or open is never uploaded.
Checked against references
Results are tested against published test vectors and specifications, and every page shows when it was last updated.
Built on trusted libraries
CodeMirror, jose, cron-parser, sql-formatter and other open-source libraries do the heavy lifting, and each page names them.