Unit converter
Convert 100 units across 14 measurement categories.
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Conversions, calendars, text and developer tools.
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Only tool links are saved on this device.
18 tools
Number base converter
Convert large integers between bases 2–36 without rounding.
Open toolColor converter
Convert HEX and RGB colors to HEX, RGB and HSL.
Open toolCalendar converter
Convert Gregorian, Persian and civil Islamic dates.
Open toolMonthly calendar
Browse Gregorian, Persian and Islamic civil months.
Open toolDate calculator
Find days between dates or add and subtract days.
Open toolTime zone converter
View one UTC instant in worldwide time zones.
Open toolUnix timestamp
Convert Unix seconds or milliseconds to a UTC date.
Open toolDuration converter
Break seconds into days, hours, minutes and seconds.
Open toolText workbench
Count, change case, clean, sort and deduplicate text.
Open toolText encoder & decoder
Encode Unicode text as Base64, URL or HTML entities.
Open toolJSON formatter
Validate, format and minify JSON without executing it.
Open toolCSV ↔ JSON
Convert quoted CSV tables and arrays of JSON objects.
Open toolText hash generator
Calculate SHA-256, SHA-384 and SHA-512 digests.
Open toolPassword generator
Generate random passwords locally with Web Crypto.
Open toolUUID generator
Generate cryptographically random UUID version 4 identifiers.
Open toolPercentage calculator
Calculate percentages, relative changes and increases.
Open toolAspect ratio calculator
Simplify image ratios and calculate proportional dimensions.
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These tools run locally in your browser. Unit factors are built in; calendars and time zones use your browser’s internationalization data. No accounts, uploads or paid API calls. Currency rates, official holiday data and personal calendar syncing are not included.
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