Small tools that run in your browser
Small tools that work in your browser, each with its method and worked examples written out below it.
Developer tools
- JSON FormatterPaste JSON to format it with indentation or minify it to one line. If the JSON is invalid, you see the line and column of the first error.
- Text ComparePaste two versions of a text to see which lines were added or removed. The changed part of each edited line is highlighted.
- Character CounterType or paste text to count its characters with and without spaces, its lines and its size in UTF-8 bytes. Set a limit to see how many characters you have left.
- Mermaid ViewerPaste the Mermaid code from your docs or GitHub and see the diagram right away. Download it as SVG or PNG. Your code is never sent to a server.
- Markdown ViewerPaste the Markdown from a README or a note and see how it looks. Copy the formatted text into an email or a document. Your text is never sent to a server.
Everyday tools
- Ladder GameEnter names and outcomes, then follow the ladder to see who gets what. Use it to decide who buys coffee, who goes first or who does a chore.
- Date CalculatorCount the days between two dates, or find the date that is a number of days, weeks, months or years before or after another date.
- D-Day CalculatorSee how many days are left until a date or have passed since it, and find 100-day, 1,000-day and yearly milestones from a start date.
- Percentage CalculatorFind a percentage of a number, what percent one number is of another, how much a value went up or down in percent, and a value after a percentage increase or decrease.
- Ovulation CalculatorFor people trying to conceive who want to plan ahead. Enter the first day of your last period and your cycle length to see your fertile window, estimated ovulation day and next period for the next three cycles.
Finance tools
- Interest and Compound Interest CalculatorWork out the interest and the amount at maturity for a one-off deposit or a monthly savings plan, and see how a lump sum grows with compound interest over the years.
- Loan CalculatorFind your monthly payment and the total interest, and see in a month-by-month schedule how much of each payment goes to principal and to interest. You can add an interest-only period and a prepayment.