EncodersBase64 and URL encode/decode in one place — instant, client-side conversion.JWT DecoderDecode JWT header & payload, inspect claims, optionally verify HS256 signatures.JSON FormatterValidate, pretty-print, and visualize JSON with syntax highlighting.Mermaid LiveWrite Mermaid diagrams and see them render live — pan, zoom, export, and share.MindmapBuild mindmaps with keyboard shortcuts — saved to local storage, export PNG/SVG/JSON.C4 DiagramsWrite Structurizr DSL and render C4 context/container/component diagrams — saved to local storage.ExcalidrawHand-drawn whiteboard — sketch shapes, text, and freedraw; export PNG/SVG. Runs fully in-browser.

account_treeMindmap

Mindmap

Build mindmaps right in your browser. Tab adds a child, Enter adds a sibling, double-click to edit, drag a top-level branch across the root to flip its side. Maps are saved to this browser's local storage — nothing leaves your device.

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