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Tools
Each tool is one job in the browser. Enter the numbers on that page; the math stays on this device.
On this device
This browser still has a job you started. Nothing here was uploaded.
Time Zone Converter
Compare two IANA zones on a date you enter, including daylight saving on that date.
Meeting Planner
One instant in three zones, marked on a single UTC-day axis, with the hour gaps for that date.
Countdown
Days, hours, minutes, and seconds from this device’s clock to a date you enter. Updates every second.
Date Difference Calculator
Subtract start from end. Blank times are midnight; January 1 to February 1 is 31 days.
Unit Converter
Length, weight, temperature, and US volume, with a labeled metric starting switch.
Random Picker
One non-empty line, one equal chance. Named lists can stay in this browser; the last five picks stay in this tab.
Password Generator
Local random string from the sets you turn on. The page does not keep the result.
Aspect Ratio Calculator
Lock height ÷ width. 1920 × 1080 at width 1280 becomes 720.
Hex to RGB
#RRGGBB and rgb(r, g, b), with a preview and a field error for a bad hex string.