Developer Packs 31 Offline Tools Into a Single 133 KB HTML File

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A developer has built a self-contained HTML file housing 31 common developer utilities, including a JSON formatter, JWT decoder, regex tester, and UUID generator. The entire application weighs approximately 133 KB and runs locally in any modern browser with no backend, dependencies, or external API calls. The project was motivated by privacy concerns around pasting sensitive data into third-party websites, as well as a desire to reduce unnecessary data movement. It features a command palette, categorized sidebar, localStorage state saving, and dark/light mode, all within a single file. Two versions are available: a free nine-tool Lite edition and a full 31-tool version for a one-time payment of nine dollars.

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