Justools
A free toolkit for everyday personal tasks and small-business work. Open a tool, finish the job, and download the result, private in your browser.
No signup. Core tools process in your browser.
Recently added practice games, plus everyday personal and business tools.
Interactive color-guided piano for playing traditional songs
Open tool →Practice public-domain songs on your own piano. The page shows the next note, listens with the mic or MIDI, and waits until you play it.
Open tool →Practice addition, subtraction, multiplication, and division with a 60s sprint and a 12x12 heatmap
Open tool →Combine PDFs in your browser
Open tool →Interactive molecule builder. Snap hydrogen, oxygen, and carbon atoms together into water, salt, and real chemical formulas
Open tool →Drag analog clock hands, with live digital time, guide lines, and stepped practice
Open tool →Calculate required hourly and daily billing rates from take-home income, expenses, tax buffer, and billable hours
Open tool →Interactive water cycle diagram. Explore evaporation, condensation, precipitation, and collection with weather simulations and quizzes
Open tool →Random decision picker wheel for choices, games, and classrooms
Open tool →Build a 2x2 perceptual or brand positioning map with competitor logos, drag to position, and export
Open tool →Calculate 18-year child rearing costs, category allocation, and multi-child expenses across 20 countries
Open tool →Interactive dinosaur encyclopedia and science lab. Explore T-Rex, Triceratops, Mesozoic eras, diets, and fossil quizzes
Open tool →Common tasks people open first.
Combine PDFs in your browser
Open tool →Extract pages or split to ZIP
Open tool →Convert JPG, PNG, and WebP
Open tool →Create and scan QR codes
Open tool →Format and validate JSON
Open tool →City budgets for Australia, New Zealand, the UK, the US, Canada, Singapore, Taiwan, South Korea, Japan, and 11 European countries. Local currency by household.
Open tool →Built for people and small businesses who want a quick job done without installing software or creating an account.
Each page does one job well, with clear steps and FAQs when you need them.
Core tools are free, with clear limits and no account required.
Most file tools run in your browser. Your files are not uploaded to Justools servers for processing.
Browse personal, business, or learn tools, or read how we handle privacy.