About
HiFreeTools is a free, fast collection of browser-based tools: calculators (percentage, finance, health), unit converters, a live currency converter, text, color and SEO tools, and developer tools like a JSON formatter, Base64 encoder, JWT decoder and regex tester. Most tools run entirely in your browser, so the data you enter isn't uploaded. No sign-up is required, every tool shows its formula or method and cites sources, and most can be embedded on your own site with one line.