Converters

Convert units, times, numbers, colors and data formats instantly. Results update as you type and nothing you enter leaves your browser.

Unit Converter

Length, weight, temperature, volume, area and speed.

Time Zone Converter

Convert a time across cities with daylight saving.

Number Base Converter

Binary, octal, decimal, hex and any base to 36.

Roman Numeral Converter

Numbers to Roman numerals and back, with breakdown.

Color Converter

HEX, RGB, HSL, HSV and CMYK with picker and contrast.

CSV to JSON

CSV to JSON with delimiter detection and types.

JSON to CSV

JSON to CSV with nested objects flattened.

JSON Formatter & Validator

Format, minify and validate JSON with error locations.

About our converters

These converters cover everyday and developer needs without any currency or exchange-rate data, so every result is exact and works offline once the page has loaded. Time zone results use your browser's built-in time zone database, and the data converters parse CSV and JSON properly, including quoted fields and nested objects.