ToolNest - 131 free tools that run entirely in your browser
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ToolNest is a free toolbox of 131 calculators, converters, PDF tools and developer utilities that run 100% in your browser — nothing you type is uploaded anywhere. It covers the everyday jobs people actually search for: a mortgage calculator, a compound-interest planner, salary-and-tax calculators, unit converters, and tools like a JSON formatter and regex tester for developers. No sign-up, no accounts, no file ever leaves your device.
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Hi Product Hunt — I built ToolNest because I kept landing on calculator sites that wanted my email before they'd show me a number, or "free" PDF tools that uploaded my files to a server I knew nothing about. So I built the opposite: 131 tools that run entirely in the browser. Your salary figures, your mortgage numbers, your documents — they never leave your machine, because there's no server for them to go to.
The set grew one tool at a time, and only ever in one direction: somebody was searching for it, and the existing options were ad-choked, sign-up-gated or uploading data they had no business uploading. Finance and health calculators came first, then converters, PDF tools and the developer utilities I wanted for my own work.
Everything is free, and I read every suggestion that comes in. If there's a calculation you do on a scrap of paper or in a spreadsheet tab you keep reopening, tell me — that's exactly how the last fifty tools got built.