BinaryDecimal.com for Web Apps

65+ free calculators and tools that run in your browser. No sign-up, nothing uploaded.

Binary Decimal is a free collection of 65+ calculators and tools that run entirely in your browser. There's nothing to install and no account to create, and what you type stays on your device.

What's inside:

• Health & fitness: BMI, kids' growth charts, blood sugar log, GLP-1 weight-loss forecast, a workout plan generator and a program builder for personal trainers

• Money: mortgage, loan prepayment, refinance, compound interest, car buy vs lease, solar payback

• Math & science: percentages, fractions, number systems, unit conversion with 58 ready-made converters

• Learn: interactive Linux and Python courses with a practice terminal and real Python in the browser

• Create: photo editor, image converter and compressor, PDF tools, Markdown and diagram editors, QR code scanner and generator

• Tech: regex tester, cron expression generator, JSON validator, device tests (mic, webcam, keyboard, gamepad)

• Time: online timer, Pomodoro, world clock and time zone converter

Why people use it:

• Private by design: tools run on your device, and a counter at the bottom of every page shows how many uploads it made (zero)

• Clear answers with the working shown, and the sources cited

• Works offline once a page has loaded, with app mode for a distraction-free view

• Light and dark themes, accessible, and printable reports for the tools that have charts