PlayTools
playtools.app
FintechFree online calculators, converters & developer tools — loans, JSON, units, currency & more. No sign-up, runs in your browser.
About
PlayTools
Free online calculators, converters & developer tools — loans, JSON, units, currency & more. No sign-up, runs in your browser. 68 free tools for finance, development, and everyday tasks. No account required, instant results in your browser. A free loan repayment calculator for monthly payments, total interest, and the full cost of borrowing on any fixed-rate loan — mortgage, car, student or personal. Convert between 30 world currencies with live or manual exchange rates. Handles USD, EUR, GBP, JPY, CNY, and more. Format, validate, and minify JSON with syntax highlighting and error detection. Runs entirely in your browser. Generate strong random passwords with custom length, uppercase, lowercase, numbers, and symbols. Convert between units of length, weight, temperature, area, and speed. Results update instantly. A percentage calculator with three modes: find a percentage of a number, work out what percent one value is of another, and calculate percentage increase or decrease between two values.
Updated September 24, 2026Community
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